Dissertations / Theses on the topic 'UV curing'
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JANSEN, JOSE U. "Síntese e caracterização de verniz eletroisolante para cura dual UV/termica." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11374.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Arsu, Nergis. "Some aspects of free radical polymerisation in UV-curing." Thesis, City University London, 1993. http://openaccess.city.ac.uk/8266/.
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Various quinoxalines, in association with N-methyld-iethanolamine as synergist, were used to initiate the polymerisation of acrylates. It was found that the quinoxalines where used with amine synergist are efficient Type II initiators. It was also found that the cure of the acrylate is faster when oxygen is present in the reaction mixture than when it is absent. The photoinitiating efficiency of 2-Methyl-1-[4-(methylthio)phenyl]-2- morpholinopropane-1-one (IRG-907) was compared to different initiators using RTIR spectroscopy and N-Isopropylmorpholine(IPM) was used as a model to investigate the properties of the morpholino sustit.uent present in IRG-907. It was shown by RTIR spectroscopy, photocalorimetry,bulk polymerisation and the curing of thin films that 1PM acts as a physical quencher for the triplet state of IRG-907 and that it is a very poor hydrogen donor. Sensitisation of IRG-907 by lix was also investigated and it wasconfirmed that lix can sensitise the cleavage of 1RG907. Photoinduced fragmentation of aminoalcohols by quinoxalines are discussed and the reactivity of the aminoalcohols reflect their ability to undergo electron transfer and to fragment. A wide range of aminoalcohols were synthesised and used as synergist in the polymerisation of a number of acrylates using different methods and the photoyellowing and photooxidation of aminoalcohols were also investigated. Some mixed acrylate-cinnamate systems were prepared to investigate a new dual cure system. The conversion percentage was found to be very low. The lack of cure is probably due to the cinnamates are scavenging the benzoyl radicals.
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Mouillat, Claire G. J. "Application of UV curing to the preparation of composite materials." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360968.
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Herlihy, Shaun Lawrence. "Factors influencing the efficiency of photoinitiation in radiation curable ink formations." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360974.
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In an effort to be able to use photoinitiators to their maximum potential, the sequence of events that occurs in an ink formulation during the UV curing process has have been studied and information presented to allow more effective formulation. Emphasis has been placed on highlighting the variables that have the greatest impact both on photoinitiator efficiency and on the suitability of individual photoinitiators and synergists for use in particular applications. These variables were found to be photoinitiator thermal stability, UV light utilisation, reaction mechanisms and cure reactivity. A wide range of photoinitiators and synergists were investigated using thermogravimetric analysis (TGA) and thermogravimetric analysis-mass spectroscopy (TGA-MS) to define both their thermal stability and whether under heating they thermally decompose or merely evaporate. Differential photocalorimetry (DPC) was used to determine which wavelengths from a typical medium pressure mercury curing lamp are the most important for providing cure, with both theoretical and practical methods being used to define the extent to which these wavelengths penetrate into pigmented and non-pigmented coatings. A procedure was devised and validated for this purpose. The reaction mechanism and photodecomposition products of a range of photoinitiators were investigated using gas chromatography-mass spectroscopy (GC-MS) and radical trapping experiments. The reaction mechanisms are discussed in terms of available literature knowledge. Evidence is also presented suggesting that, with only particular exceptions, cleavage photoinitiators can also react by a hydrogen abstraction mechanism in the presence of an amine synergist. A real time infrared spectrometer (RTIR) was set up and a method validated for following the UV curing reaction through changes in the acrylate double bond concentration. The advantages and disadvantages of this instrument are discussed in terms of other similar instruments reported in the literature, and the technique subsequently used to measure the reaction rates of a wide range of photoinitiators. Other factors such as photoinitiator concentration, amine synergist type I level and formulation viscosity were also investigated to determine their influence on the cure process.
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Zeng, Jianming. "Controlled structure UV curable resins for ink jet printing." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/8714.
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Torfgård, Olof. "Short wavelength UV–LED photoinitiated radical polymerization of acrylate–based coating systems—A comparison with conventional UV curing." Thesis, Uppsala universitet, Strukturkemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-442431.
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The present work was performed at Sherwin–Williams Sweden group AB with the objective of comparing short-wavelength light emitting diodes (UVB/UVC) with the conventional mercury arc lamp as a curing method of acrylate-based, UV-paint undergoing free-radical polymerization when exposed to UV-radiation. Due to environmental and health risks, mercury-doped radiation sources will be phased out in the near future, according to the United Nations Minamata convention, hence new alternatives are needed. Light-emitting diodes differ from the mercury arc lamp as they provide semi-discrete output intensity lines within the UV spectrum instead of a broad output distribution with several main intensity lines. The power output is also considerably lower compared to the conventional method which limits the irradiance and dose that are key parameters in activating and propagating free-radical polymerization of UV-paint. Seven different light-emitting diodes between 260–320 nm was examinedand compared to the conventional mercury arc lamp. Cured coatings were evaluated by measuring the relative extent of acrylate conversion with ATR-FTIR and micro-hardness indentation test. Both methods correlate to the relative cross-linking density and qualitatively describe the curing process for each radiant source at a specific irradiance and dose. Three different paint formulations with widely different properties were used in the experiments. All three paints were able to cure with one or several light emitting diodes at comparable doses and 10 to 20 times lower irradiance to the conventional mercury arc lamp, resulting in similar acrylate conversion and hardness.
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Nebioglu, Ahmet. "NETWORK FORMATION AND THERMO-MECHANICAL PROPERTIES OF PHOTO-CURING HYBRID COATINGS." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145166725.
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Hu, Qi-Ang. "UV curable resin for ink jet printing on textile substrates." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/8550.
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Bradley, Grant. "Hexaarylbisimidazoles as initiators of acrylate polymerisation : some new synthesis and application." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360967.
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Baxter, J. E. "Acylphosphine oxides as photoinitiators." Thesis, City University London, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380699.
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Belbakra, Zakaria. "Investigation and characterization of polythiol (meth)acrylate based resins for UV-curing applications." Thesis, Mulhouse, 2013. http://www.theses.fr/2013MULH6193.
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L’objectif de cette thèse est de développer des matériaux polymérisés par rayonnement ultra-violet possédant une bonne balance des propriétés thermomécaniques entre résistance à la température, rigidité (strength) et résistance à l’impact. Une direction vers cet objectif est l’utilisation de résines (meth)acrylate modifiées avec des thiols polyfonctionnels. Cependant, les thiol-ene en général sont sujets à un problème de polymérisation prématurée incontrôlée même à l’abri de la lumière. Ce problème doit être traité puisque celui-ci conditionne le succès des thiol-ene dans le domaine des photopolymères. La première partie de cette thèse concerne l’élaboration de résine (meth)acrylate modifiée par l’incorporation d’un polythiol, le pentaerythritol tetrakismercaptopropionate (PETMP), à différents ratio. Les propriétés thermomécaniques et photochimiques de ces résines sont à l’étude. La seconde partie traite du problème de polymérisation prématurée incontrôlée des thiol-ene. Une étude de stabilité thermique aboutissant à des résultats très encourageant est proposée. Finalement, la dernière partie porte sur la caractérisation des réseaux photo-réticulés par pyrolyse-GC/MS. La compréhension de la constitution des réseaux tridimensionnels devraient apportés des avancées dans l’élaboration de nouveaux matériaux. Une nouvelle méthode de caractérisation utilisant la pyrolyse-GC/MS directe à multi-étapes est développée. Enfin, des résultats sur l’application de la méthode sur des matériaux à base de (meth)acrylate difonctionnel photopolymérisés ainsi qu’une tentative de caractérisation de matériaux à base de polythiol/(meth)acrylates photopolymérisés sont reportés puis discutésThis thesis fall within an approach aiming to develop UV-processed materials having a good thermo-mechanical properties balance between strength, temperature resistance and impact resistance. A direction toward this objective is the use of photocurable (meth)acrylate resins modified with polyfunctional thiols. Indeed, thiol-ene chemistry is known to have poor sensitivity toward oxygen inhibition, to improve the dimensional stability and toughness properties of photocured materials. However, thiol-ene resins are subjected to premature uncontrolled dark polymerization, an issue that has to be solved for their success in the photopolymers area. The first part of this work is focused on the thermo-mechanical and the photopolymerization properties investigation of a pentaerythritol tetrakismercaptopropionate (PETMP) modified (meth)acrylate based resin by looking at different ratio of polythiol/(meth)acrylate. The second part is dedicated to the understanding of the thermal instability of such systems and to the solving of this issue. Finally, a special interest is brought to the characterization of photopolymeric networks by pyrolysis-GC/MS. The lake of deep understanding and view about how the cured networks are really constituted due to the difficulty to analyze insoluble cured polymers, prevents improvements in the formulation of high performance materials. Further information on cured networks constitution could bring useful information for the elaboration of new materials. A new characterization method based on direct multi-step pyrolysis-GC/MS is developed and an attempt on the characterization of polythiol (meth)acrylate material by Py-GC/MS is reported and discussed
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LISANTI, CLARA. "Application of quaternary ammonium monomers in the UV curing for antibacterial surface development." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2534517.
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Microbial adhesion and the development of biofilms on surfaces are recognized as common problems in residential, commercial, industrial and medical applications because
of the potential of human contamination with pathogens. To alleviate the problem, it is not necessary to kill microbes in the environment, but only to prevent the proliferation of bacterial cells on surfaces.
Coatings with polymer films endowed with biocidal properties can represent a way to sanitize surfaces thus avoiding cross contamination and increasing the safety in food manufacturing.
The objective of this PhD thesis was to develop an additive for acrylate-based polymeric materials that renders them contact-active antimicrobial during the polymerization process without further treatment. Both methods and products of this study have been designed according to the various requirements of an application-oriented antimicrobial surface coating: strong antibacterial activity, durable and nontoxic nature, no leaching of any active component, non-altered bulk properties.
Quaternary ammonium compounds (QACs) have been chosen as antimicrobial agents due to their highly bactericidal and non-toxic nature. Contact killing, as the mechanism of action of QACs, is a safe and environmentally friendly way to prevent microbial growth.
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Mišák, Jiří. "3D tvarování keramické suspenze vytvrditelné UV zářením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229921.
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Diplomová práce je zaměřena na přípravu koloidních suspenzí, vytvrditelných UV zářením, jenž jsou určeny k 3D tisku komplexních keramických vláknových struktur. Rovněž jsou v práci představeny techniky následného tvarování vytisknutých a vytvrzených struktur. Z hydroxyapatitu ve formě prášku a komponent, vytvrditelných UV zářením, byly vytvořeny pasty, určené k 3D tisku komplexních keramických vláknových struktur a multivrstev. U takto vytisknutých a vytvrzených struktur bylo navíc dosaženo zlepšení kvality povrchu a soudržnosti vláken. Pro výrobu past, určených k 3D tisku, s vhodnými reologickými vlastnostmi je nezbytné důkladné pochopení interakcí mezi částicemi, surfaktantem a monomerní/oligomerní směsí. Za použití lineárních a zesíťujících oligomerů jako disperzního média vznikají po tisku a UV vytvrzení velmi flexibilní vláknové mřížky, které lze dále tvarovat a takto vytvářet rozmanité struktury. Tyto struktury jsou následně slinuty, bez významných vad na povrchu či delaminace vrstev, za vzniku složitých keramických těles. Vysoké kvality povrchu je dosaženo UV vytvrzením vytisknutých struktur v argonové atmosféře, která brání kyslíkové inhibici radikálů v blízkosti povrchu vláken. Výhody kombinace 3D tisku s UV vytvrzováním jsou demonstrovány v této práci za užití dvouvrstvých flexibilních struktur, určených k následným metodám 3D tvarování. Takto vytvořených složitých 3D struktur je jen velmi obtížné, ne-li nemožné, dosáhnout pouze užitím přímého 3D tisku. Na základě této práce může být v budoucnu odvozena univerzální teorie k přípravě past, určených k 3D tisku komplexních keramických struktur pro různé aplikace.
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Fatnasare, Ike S. "A study of the effect of water-pick up of UV curable offset ink on its curing time and its end use properties /." Online version of thesis, 1993. http://hdl.handle.net/1850/11169.
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Veselý, Jan. "Polykrystalická keramika transparentní pro viditelné a infračervené vlnové délky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228929.
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his thesis deals with preparation of transparent ceramic sheets made out of sub-µm alumina powder. Green bodies are prepared by ultraviolet (UV) curing of UV curable resin containing ceramic powder followed by debinding of organic parts at elevated temperature. High relative density of green bodies is essential for reduction of shrinkage during subsequent sintering process. Therefore high solids loading dispersions containing > 57 vol% ceramic particles are used. To reach transparent behaviour, porosity within the sheets must be reduced completely. Therefore hot isostatic pressing (HIP) is used as a final operation. Finally, light transmission and hardness measurements are presented. Possibilities of making high resolution microstructures using maskless lithography and some suggestions for use of the UV curing technique for production of complex-shaped 3D structures are briefly mentioned.
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Vogt, Iris. "Strukturelle Klebungen mit UV- und lichthärtenden Acrylaten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24086.
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UV- und lichthärtenden Acrylatklebstoffen steht ein breites Anwendungsspektrum im Konstruktiven Glasbau offen. Ihr farbloses und klares Erscheinungsbild fördert eine Konstruktion, die transparent und leicht wirken soll. Kurze Aushärtezeiten, die sich im Sekunden- oder einstelligen Minutenbereich bewegen, ermöglichen eine schnelle Herstellung und reduzieren die Lagerzeiten. Die geklebten Konstruktionen können direkt weiterverarbeitet werden. Durch diese Vorteile heben sie sich von den Silikonklebstoffen ab, die für ausge-wählte Anwendungen im Fassadenbau (Structural-Sealant-Glazing-Systems - SSGS) bauaufsichtlich zugelassen sind. Gegenstand dieser Arbeit ist die Aufstellung von Empfehlungen zur Planung und Berechnung struktureller Klebungen mit strahlungshärtenden Acrylaten. Dafür werden Klebstoffe an dem reinen Material sowie in Verbindungen mit Glas und Metall untersucht. Für ein umfangreiches Bild über das Verhalten des Materials bieten sich Substanzprüfkörper an, die mit überschaubarem Aufwand eine Auswertung verschiedener Einflüsse - beispielsweise Temperatur und Prüfgeschwindigkeit - erlauben. An in-situ-Prüfkörpern kann der Klebstoff in der Verbindung betrachtet werden. Durch Wechselwirkungen zwischen Klebstoff und Fügeteil bildet sich eine sogenannte Grenzschicht aus, die gradierte Eigenschaften besitzt und die Materialkennwerte - besonders bei dünnen Klebfugen - beeinflusst. Weiterhin erlauben diese Prüfkörper eine Aussage über das Tragverhalten der Klebverbindung. Um das Potenzial der Acrylatklebungen in der Glasarchitektur aufzuzeigen und in der Anwendung zu prüfen, werden Bauteile mit punktförmig geklebten Halterungen untersucht. Absturzsicherungen werden statischen und dynamischen Belastungen unterworfen. An Überkopfverglasungen werden Trag- und Resttragfähigkeitsuntersuchungen durchgeführt. Bauteile im Freien geben Aufschluss über das Alterungsverhalten unter natürlichen klimatischen BedingungenUV and light curing acrylates present a whole host of possibilities for the implementation of glass construction. Their clear and colourless appearance produces a transparent and lightweight construction. Short curing times consisting of no more than mere minutes allow for quick production with minimal downtime within the overall process. Processing can be resumed immediately once bonding has occurred. The advantages of acrylates can be compared to the characteristics and properties of adhesive silicones which have been widely approved by building authorities for specific façade applications (Structural-Sealant-Glazing-Systems - SSGS). The subject matter of this study is the development of auxiliary tools to plan and design adhesively bonded joints of UV and light curing acrylates. These adhesives are, therefore, analysed both generally as bulk material and in applications as a joint between glass and metal. The use of dog bone shaped specimens is recommended to analyze the material behaviour under a variety of influence factors such as temperature and testing rate. The bonded joints of test specimens provide an opportunity to examine the interaction between the adhesive and the materials to which they are adhered. An interface with graded properties is formed based upon the interactions between adhesive joints and each particular substrate. Further on, bonded specimens enable the development of a statement concerning the load-bearing capacity of joints. Constructions having spot bonded joints are tested to demonstrate the potential use of acrylic joints in architectural glass treatments. Safety barriers are tested under both static and dynamic loads. Sloped roof systems are tested to substantiate load-bearing capacity and to verify any residual carrying capacity. Components are exposed to natural weathering in order to examine the affects of ageing on the adhesive
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STRONGONE, VALENTINA. "Preparation and characterization of UV-LED curable composite systems based on carbon fillers." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2875751.
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Henkel, Rouven Christoph. "Der Einfluss der UV-initiierten RAFT-Polymerisation auf die Strukturen und Eigenschaften von Polymernetzwerken." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://hdl.handle.net/11858/00-1735-0000-0023-98E2-6.
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Sung, Jonggeun. "Design and synthesis of plant oil-based UV-curable acrylates for sustainable coating applications." Diss., Kansas State University, 2018. http://hdl.handle.net/2097/38657.
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Doctor of PhilosophyDepartment of Grain Science and Industry
X. Susan Sun
A demand in sustainable polymers has been increased because of the environment concerns and saving finite petroleum resources. Plant oils are promising renewable resources to produce environmentally friendly polymer applications. Soybean oil-based resins such as epoxidized soybean oil (ESO) and acrylated epoxidized soybean oil (AESO) have been well-known functionalized plant oils, but relatively low performances of their polymers and a competition with food production have been disadvantages. Thus, in this study, we designed new plant oil-based acrylates using non-food resources and achieved excellent properties of the acrylates for coatings and thermoset applications. Firstly, we developed coating materials with high mechanical, thermal and coating performances using acrylated epoxidized camelina oil (AECO) as a main acrylate monomer with various meth(acrylates) as reactive diluents Next, acrylated epoxidized cardanol modified fatty acids from camelina oil (AECFA) was successfully synthesized, and a phenolic structure with long aliphatic side chains with acrylic groups was obtained. The novel structure of AECFA provided rigidity into its polymer maintained with flexibility, and AECFA coating material showed better performances in terms of all properties such as mechanical, thermal, viscoelastic, and coating performances, as compared to commercial AESO resin. Finally, acrylated epoxidized allyl 10-undecenoate (AEAU) was developed from 10-undecenoic acid, castor oil derivative. The single fatty ester structure with di-functional acrylates of AEAU had very lower viscosity and showed better thermoset performances than those of triglyceride-based acrylates such as AESO and AECO. Thus, AEAU had a potential to an alternative to AESO for thermoset applications.
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Vogt, Iris [Verfasser]. "Strukturelle Klebungen mit UV- und lichthärtenden Acrylaten = Structural bonded joints with UV and light curing acrylates / vorgelegt von Iris Vogt. [Technische Universität Dresden, Fakultät Bauingenieurwesen, Institut für Baukonstruktion]." Dresden : Inst. für Baukonstruktion, 2009. http://d-nb.info/1007550953/34.
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Bergman, Gerald R. "Evaluation of Exposure to Optical Radiation in Medical Diagnostics and Treatment." University of Toledo Health Science Campus / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=mco1095952844.
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Javadi, Ali. "METHACRYLATED POLY(ETHYLENE GLYCOL)S AS PRECURSORS FOR SUPERPLASTICIZERS AND UV-CURABLE ELECTRICAL CONTACT STABILIZATION MATERIALS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1508331641641639.
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BAZZANO, MARCO. "Development of UV-based polymerization techniques for the production of drug delivery devices." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2705288.
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Production of particles with dimension in the submicron scale underwent a significant increase in the last decades. The idea to exploit these devices to actively target a wide range of applications drove many important efforts in the development of such particles. In particular, the possibility to encapsulate and release active ingredients with desired rates, as well as to specifically target certain areas of the human body, is of huge importance in therapeutic treatments.
Among the broad spectrum of micro and submicron particles, polymeric particles represent an extremely versatile class of devices. Their high biocompatibility and possibility to swell or degrade to enhance release once in contact with body fluid are particularly interesting in drug administration.
This work was focused on the development of new techniques to produce structured polymeric particles in the micro and nano regions. Two rather different polymerization techniques were investigated and modified in order to pursue this goal: miniemulsion and aerosol polymerization. In both cases, polymerization triggering was achieved by UV light in presence of photo-initiator compounds and two reaction mechanisms were investigated: radical and cationic.
Miniemulsion polymerization was studied as a case study of a well-known technique for production of polymeric particles. One major modification was applied to the standard experimental setup: polymerization was confined at the interface between dispersed and continuous phase, thus producing capsules with a polymeric shell and a liquid core. The product was characterized and the impact of process conditions on size and morphology of capsules was evaluated. In particular, ultrasound exposure time was used to design capsules size. After optimization of process parameters, an active ingredient was encapsulated. Its controlled release was evaluated in case of different polymeric shells. Differences were observed using different degrees of crosslinking in the polymeric material, thus showing the possibility to design release rate by varying the ratio between monomer and crosslinker.
Aerosol polymerization was studied as a rather new technique for production of polymeric particles. It is a continuous process that does not require a liquid medium nor, usually, surfactants. For these reasons, it does not imply a cumbersome downstream work of purification. One major drawback of this technique is the challenging particles
structuring process. In our work, phase separation was induced within aerosol droplets to obtain structured particles. Mixtures of ―good‖ and ―bad‖ solvents were used to carefully design solubility of the monomer and its oligomers in the sprayed solution. Thus, it was possible to obtain different porous particles morphologies simply by varying the ratio between the two solvents. Capsules structures were obtained using different approaches in cationic and radical mechanism. Chain transfer mechanism was applied in cationic polymerization by adding an alcohol in the sprayed solution, while the addition of a soft-maker was crucial for the production of polymeric shells in radical polymerization. In both cases, the goal was to delay gelation of the polymeric structure, thus providing more time for the structuring process. Once the particles morphology was designed, an active ingredient was encapsulated within different types of particles and its release was monitored.
Molecular dynamic simulations were carried out to study the mechanisms that control the structuring process in aerosol cationic polymerization. Diffusion of the oligomer in the solvent mixture, as well as its interactions with the solvents, were calculated and the results confirmed the strong impact of solvent composition on the macromolecules transport parameters and, therefore, on their morphology.
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Galland, Sylvain. "Compression-moulded and multifunctional cellulose network materials." Doctoral thesis, KTH, Biokompositer, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133564.
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Cellulose-based materials are widely used in a number of important applications (e.g. paper, wood, textiles). Additional developments are suggested by the growing interest for natural fibre-based composite and nanocomposite materials. The motivation is not only in the economic and ecological benefits, but is also related to advantageous properties and characteristics. The objective of this thesis is to provide a better understanding of process-structure-property relationships in some novel cellulose network materials with advanced functionalities, and showing potential large-scale processability. An important result is the favourable combination of mechanical properties observed for network-based cellulose materials. Compression-moulding of cellulose pulp fibres under high pressure (45 MPa) and elevated temperature (120 – 180 oC) provides an environmentally friendly process for preparation of stiff and strong cellulose composite plates. The structure of these materials is characterized at multiple scales (molecular, supra-molecular and microscale). These observations are related to measured reduction in water retention ability and improvement in mechanical properties. In a second part, cellulose nanofibrils (NFC) are functionalized with in-situ precipitated magnetic nanoparticles and formed into dense nanocomposite materials with high inorganic content. The precipitation conditions influence particle size distributions, which in turn affect the magnetic properties of the material. Besides, the decorated NFC network provides high stiffness, strength and toughness to materials with very high nanoparticle loading (up to 50 vol.%). Subsequently, a method for impregnation of wet NFC network templates with a thermosetting epoxy resin is developed, enabling the preparation of well-dispersed epoxy-NFC nanocomposites with high ductility and moisture durable mechanical properties. Furthermore, cellulose fibrils interact positively with the epoxy during curing (covalent bond formation and accelerated curing). Potential large scale development of epoxy-NFC and magnetic nanocomposites is further demonstrated with the manufacturing of 3D shaped compression-moulded objects. Finally, the wet impregnation route developed for epoxy is adapted to prepare UV-curable NFC nanocomposite films with a hyperbranched polymer matrix. Different chemical modifications are applied to the NFC in order to obtain moisture durable oxygen barrier properties.QC 20131111
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TRUSIANO, GIUSEPPE. "Novel perfluoropolyalkylethers (PFPAEs): from synthesis to applications." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2942114.
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Skelte, Gabrielle. "Enhancing colour development of photochromic prints on textile : Physical stabilisation during UV-radiation exposure." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12373.
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Textile UV-radiation sensors has lately been introduced to the field of smart textiles. Inkjet printing has been used as means of application due to the effective and resource efficient process. UV-LED radiation curing has been used in combination with inkjet printing in favour of low energy requirements, solvent free solution and reduced risk of clogging in the print heads. The problems arising when exposing photochromic prints to UV-radiations are that oxygen inhibition during the curing and photo-oxidation in the print reduces the prints ability to develop colour. It is the oxygen in the air in combination with UV-radiation that gives the photo-oxidating behavior. The aim of the study is to with the aid of physical protection reduce the effect of oxygen inhibition and photo-oxidation in the prints. Three types of physical treatments were used, wax coating, protein based impregnation and starch based impregnation. Treatments were applied before curing as well as after curing and the colour development after activation during 1 min of UV-radiation was measured with a spectrophotometer. Multiple activations were also tested to see how the treatments affected the fatigue behaviour of the prints over time. The aim was to have as high colour development as possible reflecting reduced oxygen inhibition and photo-oxidation. Results showed significantly higher colour development for samples treated with wax and whey powder before curing, but reduced colour development for amylose impregnation. Over time whey powder before curing showed highest colour development due to highest initial colour development. Lowest fatigue was seen for washed samples containing the chemical stabiliser HALS, showing an increased colour development. In reference to earlier studies the protective properties of wax and whey powder is due to their oxygen barrier properties protecting the print. The tested treatments have shown that it is possible to reduce the effect of photo-oxidation during curing leading to prints giving higher colour development. This gives a great stand point when improving existing and future application of photochromic prints on textiles.
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王沛雯. "Reaserch of UV-curing acrylates." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03564945698761523459.
Full textAbstract:
碩士東海大學
化學工程與材料工程學系
98
The UV-A ultraviolet was applied to cure acrylate resins which are composed of different components and different compositions, respectively. The samples were completely cured at a fixed UV-exposure time of 20 minutes under a circulating nitrogen atmosphere during UV irradiating. When the photoinitiator content was fixed at 1 wt. % and the ratio between oligomers and monomers changed, the temperatures of maximum rate of degradation of the resins with 80MFA oligomer decreased with increasing oligomer percentage. No matter which oligomer is used, the coefficients of thermal expansion of the samples remain constant while the oligomer percentage increases. The glass transition temperatures of the samples with 3000A oligomer increase slightly with increasing oligomer percentage. When the photoinitiator content increased and the amounts of oligomers and monomers were fixed, the temperatures of maximum rate of degradation and the coefficients of thermal expansion of the resins didn’t change regardless of which oligomer is used. The glass transition temperatures of the samples with 3000A oligomer decrease slightly with increasing amount of photoinitiator. Except for the resins with 3000A oligomer, the average surface roughness of the other samples are about 0.3 ~ 0.8 nm, which are quite small, indicating a uniform coating.
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Li, Jiansing, and 李建興. "Study of UV curing gel polymer electrolyte." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/28253018448968688647.
Full textAbstract:
碩士正修科技大學
電機工程研究所
102
In this study, the gel polymer electrolyte was fabricated by using butyrolactone (γ-BL), lithium perchlorate, (LiClO4), UV gel and ethylene glycol (EG). The optical and electrical properties of the gel polymer electrolyte were investigated. And the gel polymer electrolyte was applied to the WO3-NiO complementary electrochromic device (CECD). The electrochromic properties of CECD were investigated. Experimental results reveal that the liquid electrolyte can be obtained using γ-BL, with 1M LiClO4 and adding 5 wt.% EG. And the gel polymer electrolyte can be obtained using liquid electrolyte and UV gel in a weight ratio of 1:3. An ionic conductivity of 1.9948×10-4 S/cm (@RT), The gel polymer electrolyte was applied to the CECD. The better electrochromic CECD biased with a colored voltage of -1.5V exhibited a colored transmittance of 40%, a transmittance change (△T%) of 40% at a wavelength (λ) of 550 nm. The CECD of low temperature exhibited a △T% of 28% after -20℃. In addition, the high temperature exhibited a △T% of 40% after 120℃. The response time of the CECD was found to be about 10 s for colored and bleached state. Finally, the CECD exhibited a △T% of 23% after 10000 cycles.
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CHEN, WEi-LIANG, and 陳維良. "Studies of UV-Radiation Curing Acrylate Resins." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/33394366156658709525.
Full textAbstract:
碩士東海大學
化學工程學系
94
As a rule, polymers start to polymerize by thermal heating; however, UV curable resins make use of the suitable wave band in UV instead of heating to cure the resins from liquid state to solid state. The advantage of using UV is due to a rapid reaction and a short period in process. UV curable resins represent the value in practice just as the resins must be completely cured in a short time. This research utilized acrylate resins, DR-1 and T5-A, which are cured by the UV-A wave band in UV. In consequence, the result shows that DR-1 is better reacted with a shorter period. In addition, we also chose glass, silver, gold, silicon, and aluminum foil as a substrate, and we found that acrylate resins can be cured by aluminum foil and glass in a shorter time. Oxygen has a great impact on curing resins. In the existence of oxygen, it needs to take a long time for the whole process. Therefore, adding nitrogen during UV irradiating can contribute to reduce the amount of oxygen and take less time for curing resins.
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Lin, Tingchieh, and 林鼎傑. "Study On Multistep UV Curing Imprint Technology." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/53372138957394283933.
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碩士華梵大學
機電工程學系博碩專班
100
Nanotechnology has become very popular in recent years. It influences not only on a single type of industry but wide range of applications. However the traditional semiconductor manufacturing processes encountered bottleneck due to the resolution limit of the photolithography and nanoimprint technology provides an good alternative which is suitable for manufacturing nano-level precision components. This paper mainly invest gated acrylic mold used in the study of multi-level UV nano-imprint process and the use of UV-curable nanoimprint machine with acrylic mold to produce multi-level embossing structure with different molding process parameters to improve the results. Comparisons were then made to compare the corresponding angles between mother molds and their molded structures to make sure that the paramters of the imprinting process have been optimized.
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TING-YU, YA, and 游雅婷. "UV-curing POSS-based Nanocomposites : preparation and properties." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/15499857431835165937.
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碩士中原大學
化學工程研究所
97
A novel UV-curable polyimide/POSS nanocomposite has been prepared by introducing POSS into polyimide. POSS with eight acrylic functional groups can be cured by UV light to form crosslinking structure. UV curing material can not only shorten the reaction time but also energy saving. Environmentally friendly UV materials will be the trend of new generation materials. In this paper, properties of Polyimide/POSS nanocomposites with different POSS contents were determined. The kinetics the nanocomposite was analyzed by UV-DSC. Thermal properties of the nanocomposites were examined by thermogravimetric analyzer (TGA) and Dynamic Mechanical analysis (DMA). Surface morphology was analyzed by Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM). Mechanical properties were determined by Instron testing machine.
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Jhong, Yao-Yang, and 鍾曜陽. "UV curing of spiro orthoesters/dimethacrylate IPNs system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/43307931092549827689.
Full textAbstract:
碩士國立臺灣科技大學
高分子工程系
93
Polymers with structures of interpenetrating networks (IPNs) have been synthetized by UV-induced polymerization of a mixtures of spiro orthoester (SOE) monomers and diacrylate (Bis-GMA-TEGDMA) , SOEs/diacrylate. The reaction mechanisms of the cationic/free radical polymerization of SOEs/diacrylate initiated by the photoinitiator, diphenyliodonium hexafuorophosphate (DAI, λmax=254nm), and the consumption of each monomer (degree of conversion) during reaction were investigated measured by FT-IR. As the SOE is an expanding monomer, it can be used as a low-profile additives to lower the shrinkage during curing of the diacrylate. Therefore, the volume shrinkage during curing and thermal property of IPNs composites (Bis-GMA-TEGDMA-SOEs) were examined in detail.
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Cheng, Wei-Yuan, and 鄭磑元. "Study of Aliphatic Urethane Acrylate UV-curing Coatings." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b38ybp.
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碩士國立臺北科技大學
有機高分子研究所
105
This purpose is discussed the physical properties of the radical light-cured coating performance on ABS materials. Use with different acrylic monomers and acrylic resin light curable coatings reach on the physical properties of ABS materials adhesion, hardness, abrasion more improved. Radical curing system having acrylic group 1,6-Hexanediol Diacrylate(HDDA)、Dipentaerythritol Hexaacrylate(DPHA), added photoinitiator (1-hydroxycyclohexyl phenyl ketone) and leveling agent(Polyether modified silicone), and is to 600mj/cm2 of UV light energy. Cross hatch test paint adhesion on ABS materials, In pencil hardness meter test paint on ABS materials, In RCA abrasion meter test paint on ABS materials, In Fourier transform infrared spectrometer (FTIR) to test for different coating composition, In Dynamic Mechanical Analysis (DMA) to test Glass Transfer Temperature (Tg), In Thermogravimeteric Analysis (TGA) to test Degraded Temperature (Td), With a variety of match to reach the photo curable coating properties can be improved. As test results, DPHA were improved properties of hardness and abrasion obviously.
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TSAI, JIA-TZE, and 蔡鎵澤. "Study on the UV curing of organic monomer." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/sg92ev.
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碩士南臺科技大學
化學工程與材枓工程系
107
In this study, CDFMB photocurable films were prepared by radical polymerization and the effects of different wavelengths of UV light sources, environmental conditions, photoinitiation dose, irradiation time, coating conditions and prepolymer conditions on the hydrophobicity of photocurable films were investigated. And use the contact angle measuring instrument to measure the change of the contact angle. The results showed that optimum curing conditions for the UV-C wavelengths under nitrogen, without addition of a photoinitiator, spin coating parameters revolutions 500 rpm for 5 seconds, the illumination time of 2 minutes, the contact angle of 82.43 degrees, prepared of the prepolymer, and then cured under the same conditions, the contact angle of 85.37 degrees. The optimum curing conditions for the UV-B wavelengths under nitrogen, without addition of a photoinitiator, spin coating parameters revolutions 500 rpm for 5 seconds, the illumination time of 5 minutes, the contact angle of 75.92 degrees,prepared of the prepolymer, and then cured under the same conditions, the contact angle of 77.88 degrees. The optimum curing conditions for the UV-A wavelengths under nitrogen, addition of 3% photoinitiator, spin coating parameters revolutions 500 rpm for 5 seconds, the illumination time of 7 minutes, the contact angle of 63.88 degrees,prepared of the prepolymer, and then cured under the same conditions, the contact angle of 68.16 degrees. Finally, experimental results show that the coating illumination time of three wavelengths contact angle little effect, while a larger impact on contact angle synthesis of a prepolymer of the three wavelengths, and the UV-C lamp source is optimal for synthesizing the prepolymer and UV curing.
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Tang, Huei-Wen, and 譚慧雯. "Photopolymer of light-curing resin with UV light reaction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99t88b.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
104
In this thesis, we propose a kind of acrylic light-cured resin which was reacted to a wavelength of 250 nm ultraviolet as the 3D printer application of the process technology of digital light processing, DLP. The acrylic light-cured resin of the study used triethylene glycol diacrylate (Tri-ethylene glycol diacrylate, C12H18O6, abbreviated TEGDA) as acrylic oligomers, 1,6- hexamethylene diacrylate (Hexamethylene diacrylate, C12H18O4, Acronym HDDA)as a reactive diluent monomer and benzoin dimethyl ether (2,2-Dimethoxy-2-phenylacetophenonce, C16H16O3, called DMPA) as the photoin-itiator to irradiate and complete the cure at a fixed optical power of ultraviolet light-emitting diode (UVLED). Then to discuss the light-cured reaction of the den-sity of photoinitiator and reactive-diluted monomer to acrylic oligomers. According to the experimental data, the maximum solubility in acrylic HDDA/TEGDA mixed resin of photoinitiator DMPA is 2.0% and the viscosity in diferent formula ratio of HDDA / TEGDA mixed resin is 9 mp•s the resin under print accuracy influenced by resin viscosity. The viscosity of the whole mixture is up to 14 mp•s along with the increase of TEGDA weight percentage. When DMPA is 0.5% of the content, it is able to react and no matter what the ratio of HDDA/TEGDA mixed resin is, it can reach the hardness of 70. When DMPA increases to 2.0% with 30% of TEGDA, the hardness can be measured by 70 while UV light irradiates 35 minutes. When TEGDA is 70%, the hardness is 71 with 55 minutes of UV irradiation. This is because too much DMPA leads reaction only happened on the surface. The ultraviolet is absorbed by the surface of resins on the initial stage and interferes with the reaction of inner resins. However, a small amount of ultraviolet can still enter the inner reaction and that’s the reason why the curing time increases.
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Zhao, Tuz-Ming, and 趙子銘. "The study on photoinitiator at Cationic UV-curing Technologies." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/a2n5t3.
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Chen, Kuan-Yu, and 陳冠宇. "UV-curing Imprinting of Double-sided Aspheric Microlens Array." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/56056199759406307699.
Full textAbstract:
碩士國立臺灣大學
機械工程學研究所
104
In this research, UV curing imprint process is developed to fabricate a 4-inch double sided aspheric microlens array (5×5). Aluminum mold for aspheric microlens was first manufactured. Transparent PDMS mold core was replicated using the aluminum mold as the master. The PDMS mold cores were embedded in the PMMA mold base which was designed with alignment mark. A compressing machine customized for UV curing process with real-time optical alignment system was implemented for UV curing imprintng. After the UV-curable resin was coated on the cavity, the molds were slowly clamped and the cavity was filled. After the resin was cured with UV light, aspheric microlens array with convex profile on one side and concave profile on the other side was fabricated, the cycle time is 110 s. For the convex profile, the degree of replication was 98.58%, and 98.26% on the concave profile. As far as uniformity is concerned the coefficient of variation of diameter is 0.31%, while the coefficient of variation of height is 0.41%. The optical properties of the double-sided aspherical microlens were measured. The original light source of 1.2 mm diameter is reduced to 45 m as the spot diameter. The average effective focal length 1.433 mm and its coefficient of variation is 0.0065%, indicating the formability and uniformity. The G patterns is present a complete and clear optical image. This study demonstrates the potential of UV curing imprinting for forming double-sided aspheric microlens arrays for optical application.
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Chou, Ming-wei, and 周洺偉. "The study on photoinitiator at cationic UV-curing technologies." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/6p9n5n.
Full textAbstract:
碩士國立臺北科技大學
化學工程研究所
95
Alicyclic diepoxy resin was cured with different initiators, UVI 6992 and 6976, under UV radiation. The conversion and thermal properties of the cured films were investigated by a FTIR, DSC, and TGA. The transmission of the epoxy film was measured by a UV/VIS spectrometer. It was found that when the epoxy resin cured with the initiator, UVI 6992, the transmission is larger than 90% after wave length of 470 nm, and it is not changed apparently with addition of an antioxidant. On the other hand, with UVI 6976, the transmission of the cured film is lower, which is about 80% after wave length of 670nm, but increases by adding the antioxidant. The cause is worthy of further study. The results can be extended to develop the encapsulate materials of photo-electro devices.
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Shih, Wen-Chuan, and 施文權. "The Fabrication of UV-Curing Peel-Off Dicing Tape." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/ynm28b.
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碩士國立虎尾科技大學
光電與材料科技研究所
101
By (1)the analysis of chemical composition and glass transition temperature of pressure sensitive adhesive products, (2)the formulation design and UV adhesion assessment of pressure sensitive adhesive and oligomer, (3)to serve initiators and to assess UV adhesion hardening rate, this study develops UV curable adhesive tape (Dicing tape) dedicated for wafer dicing. Compatibility of pressure sensitive adhesive and oligomer induced residue significantly after tape was peer and the phenomenon of the residue reduces with satisfying compatibility of pressure adhesive and oligomer. The ratio of peer strength of dicing tape increased with extending amount of monomer and crosslinker, but crosslinker contributed to ration of peer strength dramatically. The experiment revealed that PSA3-oligomer was more compatible to PSA3-oligomer3 and dicing tape which was made by PSA3-oligomer showed superior ratio of peer strength. The reduction of adhesion after UV curing is due to the UV polymerization oligomer which degraded to a very low adhesion. So the serve of the oligomers is very important. A high functional group (greater than 2) and a molecular weight less than 10000 are better. The photointiator1 is better. Using T17''s formula, the goal of this study was achieved. The species and amount of photo-initiator affected the degree of the polymerization reaction substantially and exhaustive polymerization reaction generated marvelous ratio of peer strength. Measuring the degree of UV-curing reaction by Photo-DSC, the reaction of the formula of photo-initiator (B, C and D) was improved and heat of reaction was up to 113 J/g. DSC data reveled that PSA did not participate in the UV-curing reaction. The mechanism of UV-curing reaction of dicing tape was that polymerization of oligomer, monomer and crosslinker formatted new chemical bond to restrain anchorage of pressure sensitive adhesive, which restricted the peer strength of the dicing tape. The results of this research will not only enhance the competitiveness of the domestic industry, but also enhance the domestic independence of the basic materials.
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YANG, ZHONG-LIN, and 楊忠霖. "Synthesis and UV Curing of Polysiloxane‐containing Epoxy Resins." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/k89hjm.
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碩士國立雲林科技大學
化學工程與材料工程系
107
UV-curable polydimethylsiloxane containing epoxy groups was synthesized by modification of polydimethylsiloxane containing pendant or end functional silicon-hydrogen bonds with allyl glycidyl ether. It was crosslinked by cationic UV curing. Producing an elastic circuit board is our purpose. We hope the material features high temperature resistant and low moisture absorption. FT-IR and 'H-NMR were used to analysis the chemical structure of polydimethylsiloxane. Physical properties of the material were examined by tensile test, hygroscopicity test and thermogravimetric analysis. The structures of polydimethylsiloxane contain epoxy were characterized by FT-IR and H-NMR spectra, that show epoxy groups were successfully connected. The results show that the pendant functional polydimethylsiloxane-epoxy ( G-PDMS ) blended the end functional polydimethylsiloxane-epoxy( PDMS-G2 ) can improve elongation at break ( % ), which increased from 16.74% to 60.67%. The 10% weight loss temperature of polydimethylsiloxane-epoxy resins were above 300 °C, and the hygroscopicity of resins were below 0.8 %, these properties satisfied necessary of circuit board process.
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陳雅雯. "Finite Element Analysis on UV Curing of the Optical Films." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/63f366.
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Chen, Meng-Chuan, and 陳孟詮. "Optical Design and Development for Focus-Variable UV Curing System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/435w38.
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碩士國立中興大學
精密工程學系所
100
UV curing has been developed more than 50 years in the world. It is the most extensive radiation curing technology at present, but it is also a target to be strongly developed around the world. However, the development is relatively weak in our country, and most of them are still using the traditional high-pressure mercury lamp. Furthermore, the traditional high-pressure mercury lamp has many disadvantages. For this problem, this paper put forward an exploratory design on focus-variable UV curing optical system with LED ring array. We select focal length of 145mm and 330mm, and then successfully achieve the uniformity of illumination more than 80% and reach the goal of focus-variable function. In addition, we study the influence of the reflector for UV curing system in market. We found reflector can really improve the divergence of light. In this study, when the angle of the reflector is 25°, the system can have the maximum illumination. Also the light efficiency can achieve optimal utilization of light, as the angle is 35°.
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Wu, Tsai-Jung, and 吳采蓉. "Parameters Optimization of UV-Curing Rapid Prototyping Using Taguchi method." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/89955481470128834121.
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碩士國立彰化師範大學
機電工程學系
98
UV curing polymers have been widely using by the biomedical industry in recent years since it is likely to be a green process, not necessary of adding any organic solvent. Rapid prototyping (RP), a mold-less process, is capable of fabricating product fast to reduce the cycle time of developing product. Therefore RP is suitable for personal made-to-order health industry such as scaffold manufacturing in the regenerative medicine. The motivation of this research is to combine the advantages of UV curing and RP technologies to fabricate the small biomedical parts using a novel UV curing RP machine developed by ourselves. This thesis is one of the researches in advance after accomplishing the equipment development and assembly. The purpose of the research is to find optimal parameters of UV curing RP processes using Taguchi method, and then use these ones to do pilot production in order to validate the accuracy and precision as well as the process capability of the equipment. In addition, tensile tests with different stain rates were performed to evaluate the mechanical properties of biomedical polymer (Loctite 3311) after curing. The results show the optimal parameters for the UV curing RP processes are - 18.9 mm Z axle at initial position, 2500 pulse/sec moving speed for each axle, 30 sec stay after dripping, and 0.5 mm feed amount of Z axis after solidification. The precision of X, Y, and Z axis for the curing process is all ± 0.005 mm (± 2.5σ), according to the measuring results of fabricating a rectangular solid (11mm x 4mm x 2.36mm). Furthermore, the process capability index for each axis is 0.833 (CP and CPk both). The yield of fabricating the rectangular solid is 74 % (± σ), and the CP and CPK are 0.034 and 0.2109 respectively for the machine. On the other hand, it is not easy to identify the yield strength of curing material from stress-strain curve after tensile tests. Meanwhile, there is a large deformation (strain) before breaking of the material. As the results, the material for the process maintains the typical behavior of biomedical polymer after curing. The average yield and breaking strength of the samples are 17 N/mm2及22.6 N/mm2 respectively. Moreover, the breaking strength slightly increases when increasing strain rates. Key words: Ultraviolet Solidification, Rapid Prototyping, Taguchi Method, Process Capability Index.
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Liao, Chieh, and 廖頡. "Study on the UV Curing Polyurethane Spacer for Flexible Display." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/88747048874800967912.
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HSU, CHIN-CHI, and 許進吉. "Research of UV Curing Film by Vacuum Polymer Spray System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/886p2j.
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碩士國立中央大學
光電科學與工程學系
107
Volatile Organic Compounds, VOCs, are environmental source of pollution, which mainly emitted by using solvent in industry of painting. Nowadays, the workplace of painting is most in atmosphere, if we exposure in this place, it may damage the human body. In order to reduce the solvent used in painting, in other words, reduce the contact with VOCs, this study established a vacuum polymer coating system to improve the spraying environment and use solvent-free coatings to move the process of industrial coating in the atmosphere to vacuum. Recycling and exhausting systems are established in the vacuum chamber to reduce the possibility of contact with the human body; Using UV-curable materials, it is desirable to achieve a solvent-free UV-curing solution, reducing the viscosity use in a vacuum spray system, atomizing by pressure , achieving a coating effect with a minimum spray amount and rapidly curing into a film. Complete the sample and establish the process of the vacuum spray system. The study began with improvements in the materials and environment in the coating industry. The research will discuss in two parts: Part of the material: monomer trifunctional and monomer difunctional. The UV curing solutions formulated in a solvent-free form; the sprayed part has an experimental vacuum of 2×10-2 torr, and the coating material sprayed with a nozzle by a pressure. The substrate cosmetic bottle be coated into a liquid film, and then uses a high-speed camera observe the distribution of the spray during the spraying process. Thereafter, the liquid film irradiated by UV lamp formed a UV curing film. This experiment compares the effects of different viscosity on adhesion and atomization, and UV curing film formation, observes the atomization phenomenon, solves the film formation problem, and successfully produces a film with a smooth and non-porous film surface. In the heat curing and UV process on the market, there are lower temperature and less energy consumption. The UV illumination time of the coating is 50 seconds, the hardness can reach 6H or more, and the adhesion is the highest level of 5B, which is friendly environment and high. Efficiency (no solvent), low VOCs emissions process.
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Fan, Gang-Yu, and 范剛瑜. "The Study on Kinetics of UV Curing Film Containing Siloxanes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/879n7u.
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FuShunHsu and 許富舜. "UV curing resin added investigate the thermal properties of alumina." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2833ff.
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碩士國立臺北科技大學
有機高分子研究所
103
Some properties of manufacturing semiconductor packaging materials are important to note: heat conductivity, low dielectric constant, etc. Due to high melting point, high hardness, good insulation and excellent corrosion resistance, Alumina can be used in harsh conditions such as corrosive and high temperature environments. So Alumina is often used in application of semiconductor packaging material. On the other hand, ultraviolet curing resin is use ultraviolet of suitable wavelength to replace heat source and transform resin from liquid to solid. The benefits of ultraviolet hardening resin are fast reactivity and short curing time. The purpose of this research is synthesized epoxy resin (epoxy)/aluminum oxide (alumina, Al2O3) composites by UV curing resin. Using 5um, 15um, 40um alumina particles in different particle sizes of alumina powder ratio (30,50,80wt%) discussing optimum molding conditions like suitable UV curing band and light initiator addition ratio. Measuring thermal properties uses thermal mechanical analyzer (TMA) and thermal gravimetric analysis (TGA). TMA analyze the effect of powder content to composite and the change of glass transition temperature (Tg). TGA analyze composite material’s heat resistance. In another way, analyze the thermal conductivity trend of different portions of alumina powder’s particle size by using laser flash method.
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Chen, Chin-Lung, and 陳進龍. "The study of application on acrylate of UV curing ink." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/7j524d.
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碩士國立臺北科技大學
化學工程研究所
97
This research paper is applies in the plastic plate (for example PP, PE, PET and so on) makes the finishing materials the ultraviolet ray printing ink, it uses the UV ultraviolet radiation for the acrylic ester monomer, has an active free radical R • initiation chain type polymerization the light initiator. Because of it for radiation curing characteristic, to plastic material quality low superficial heat energy, and the polymerization speed receives the populace to like quickly applies all kinds of plastic plate massively. But the plastic material quality''s has the low surface energy, the radiation curing printing ink level is still challenges to certain plastic material quality adhesiveness, this research is to has the difficulty plastic, proposes the possible solution plan. Demonstrated after the experimental result that discusses and proposed the most suitable acrylic ester monomer and the widowed polymer''s formula, presents the good adhesiveness printing ink, to the plastic parent metal''s 3 correspondences is applications and so on contraction, volume expansion and surface tension. 1. Shrinkage: Should make the viscosity diluents as far as possible for the printing ink by the low function base acrylic ester monomer. 2. Volume swelling: For the printing ink formula, the use certain acrylic ester monomer should be as far as possible small to the plastic parent metal''s volume expansion. 3. Surface tension: Should be suitable as far as possible for the printing ink for the low superficial wet ability plastic parent metal. More over, when the printing ink formula is fixed, the radiation curing in the plastic parent metal, needs to each different rank plastic separately to make the appraisal to confirm its adhesiveness, because of each kind of re-vertex''s production process or the treating processes, possibly has the different parameter change. Whenever adjustment plastic surface energy, permeable surface treatment in advance, not only may promote the adhesion, moreover guarantees the adhesiveness reappearance rate.
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WU, YEN-CHENG, and 吳晏城. "Optimal Parameter Design for UV Curing Process of Optical Thin Film." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/66358252896770863908.
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碩士逢甲大學
工業工程與系統管理學研究所
94
The production operation of modern industry is facing the competition way of a small amount, diversification, and quickly response. UV curing process of optical thin film is according with this kind of characteristic. This study use Taguchi method as the main tactics to probe into three key quality characteristics of optimal parameters design for UV curing process of optical thin film, and then utilize Cause and Effect diagram to combine with the practice experience of the factory to find out 6 control factors. We choose L18 (21X37) table from Taguchi standard orthogonal arrays and dummy level to carry out the experiment. The optimal parameter can be gotten by testing analyses, thin film transport tempo, ηincreased 13dB, quality nonconformities are reduced to original 1/20 , the lamps and lanterns arrange the direction, η increased 11.9dB, quality nonconformities are reduced to original 1/15. Finally, we used additive model to predict process improvement results by optimal parameter, the results of energy density have the better effect of 18.6dB and peak irradiance have the better effect of 19.3dB. In order to identify the experimental result of optimal parameter according to Taguchi method, we obtained the process improvement effect of 11.02dB for energy density; peak irradiance has improvement effect of 5.93 dB. This experiment got the optimal parameter by Taguchi method and better effect for process improvement of UV curing process of optical thin film.
50
張簡宗彬. "Preparation and Charaterization of SBS Membrane Modified by UV-curing Grafting." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/74856850513962846585.
Full textAbstract:
碩士中原大學
化學工程研究所
85
In this study, SBS-g-DMAEMA membrane was prepared by UV-induced graft polymerization using styrene-butadiene-styrene copolymer (SBS) as substrate, dimethylamino ethyl methacrylate (DMAEMA)as monomer and benzoin ethyl ether as photoinitiator. By changing the reaction conditions, such as monomer concentration, irradiation time and irradiation temperature, SBS-g-DMAEMA membranes with different degree of grafting were obtained. The permeabilities, selectivities, diffusivities and solubilities for gases of Oxygen and Nitrogen through these modified membranes were determined from the steady-state and the time-lag data method, respectively, at different temperatures. Simultaneously, thermal properties of these modified membranes were examined by using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). From the experimental results, the amount of DMAEMA grafting on the membrane increases with the increase of temperature, monomer concentration and irradiation time. The energy of activation was evaluated to be 2.388 kcal/mole. The characterization of FT/IR-ATR absorption band of the grafted copolymer is located at in 1718 cm(-1) and 2760 cm(-1). An ESCA analysis of the grafted copolymer membrane surface show the contents of the clement of the C, O, N. Furthermore, from the data of DSC curves of these modified membranes, we can know that the glass transition temperature increases with the increasing of the amount of grafting onto membrane. TGA showed that the thermal stability of these modified membranes are worse than of SBS membrane. From the experimental results, the permeabilities and diffusivities of the membranes for gases of oxygen and nitrogen through these modified membranes were decreased with the increasing amount of the grafting and lowering the operating temperature. Furthermore, selectivities and solubilities decreases with the increasing of the amount of grafting. The value of the selectivity of O2/N2 and permeability for the 4.72 mg/cm(2) grafting of the modified membrane was 5.58 and 7.13 barrers, respectively, at 5℃. From the solubilities of the oxygen in the modified membrane, amount of monomer increasing can assist to dissolve of the oxygen and to promote the selectivity of O2/N2. From this study, the SBS-g-DMAEMA membrane have the potential of the oxygen enrichment membrane.