Дисертації з теми "Polymeric Powders"
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Brink, Andrew E. "The synthesis, stabilization and sintering of high performance semicrystalline polymeric powders." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-08062007-094411/.
Повний текст джерелаMa, Da. "Improving the Strength of Binder Jetted Pharmaceutical Tablets Through Tailored Polymeric Binders and Powders." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/101030.
Повний текст джерелаM.S.
Three-dimensional printing is well-known as 3D printing. 3D printing pills are printed from the 3D printer. As of today, we now stand on the brink of a fourth industrial revolution. By the remarkable technological advancements of the twenty-first century, manufacturing is now becoming digitized. Instead of using a large batch process as traditional, customized printlets with a tailored dose, shape, size, and release characteristics could be produced on- demand. The goal of developing pharmaceutical printing is to reduce the cost of labor, shorten the time of manufacturing, and tailor the pills for patients. And have the potential to cause a paradigm shift in medicine design, manufacture, and use. This paper aims to discuss the current and future potential applications of 3D printing in healthcare and, ultimately, the power of 3D printing in pharmaceuticals.
Syzdek, Jarosław Sylwester. "Application of modified ceramic powders as fillers for composite polymeric electrolytes based on poly(oxyethylene)." Amiens, 2010. http://www.theses.fr/2010AMIE0102.
Повний текст джерелаThe primary goal of this work was to study the influence of surface-modified inorganic fillers on the properties of composite polymeric electrolytes based on poly(oxyethylene) of both low and high molecular weight. To study all interesting factors we chose three different aluminas and two titanias characterised by different grain sizes. It appeared that only microsized aluminas are readily modified. Less sensitive to the treatment is nano alumina and the least are titanias. Then obtained powders (26 in total) were applied as fillers for polymeric electrolytes based on poly(oxyethylene) of molecular weight aqual to 500 g•mol-1 (liquid at room temperature) and 5•106 g•mol-1 (liquid at room temperature) and 5•106 g•mol-1(solid at room temperature). Lithium perchlorate was used as a salt, its concentration was fixed to be 1 mol•kg-1. In general, a vast population of samples was prepared and it was shown that starting with the same material, one can obtain totally different products. That can explain many of the discrepancies found in the literature published on this subject over the last 20 years. Apart from that a universal procedure of samples preparation was established and conditions of conductivity improvement determined
Al-Meshal, Mohammed A. S. "Physicochemical and tableting properties of crystallised and spray-dried phenylbutazone containing polymeric additives : effect of polymeric additives (hydroxypropyl methylcellulose and a polyoxyethylene-polyoxypropylene glycol) on the crystalline structure, physicochemical properties and tableting behaviour of crystallised and spray-dried phenylbutazone powders." Thesis, University of Bradford, 1985. http://hdl.handle.net/10454/4207.
Повний текст джерелаShokouhi, Mehr Hamideh. "Application of High-Performance Polyimides in Additive Manufacturing and Powder Coating." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1574204777058183.
Повний текст джерелаRammoorthy, Madhusudhan. "On-line consolidation of thermoplastic powder fusion coated filaments." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/11131.
Повний текст джерелаCheung, Wai Lam. "Bulking of charged pellets of polymeric materials." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261854.
Повний текст джерелаChatham, Camden Alan. "Property-Process-Property Relationships in Powder Bed Fusion Additive Manufacturing of Poly(phenylene sulfide): A Case Study Toward Predicting Printability from Polymer Properties." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/100053.
Повний текст джерелаDoctor of Philosophy
Powder bed fusion (PBF) is one of seven distinct additive manufacturing (AM, also known as ``3D printing'') technologies. The manufacturing process creates solid, three-dimensional shapes through selectively heating, melting, and fusing together polymer powder particles in a layer-by-layer manner. Currently, organizations are interested in complementing existing manufacturing technology with PBF for one of three general reasons: (1) "complexity is free" PBF has the ability to make shapes that are difficult or expensive to fabricate using other manufacturing technologies. (2) "tool-less manufacturing" PBF only requires a digital design file to fabricate objects. This enables small changes to be easily made via computer-aided design (CAD) programs without the need to invest time and money into tooling (e.g., molds, jigs, fixtures, or other product-specific tools). This enables "mass customized" products (e.g., custom-fit medical devices and implants) to be economically feasible. (3) "material efficiency" AM is attractive as it often generates less waste than subtractive manufacturing techniques like milling. This is particularly a concern for organizations that manufacture parts from expensive, high-performance polymers, such as in the aerospace and medical industries. Despite these benefits, the state of the art for polymer PBF has room for improvement. Specifically, there are many details regarding material behavior during PBF manufacturing that are unknown; any unknown behaviors present challenges to building confidence in production quality. Additionally, approximately 90% of current PBF use is nylon-12 or else another material in the polyamide family of semi-crystalline thermoplastics. This limited selection of commercially available materials compared against other forms of manufacturing contributes to PBF's circular quandary: the manufacturing process physics are not robustly understood because most experimentation and research has been carried out on one family of polymers; however, a wider variety of polymers has not been developed because there is a limited understanding of the process physics. This dissertation presents research toward answering both PBF challenge areas. The first three chapters present investigations into relationships between the properties of a novel, experimental grade poly(phenylene sulfide) (PPS) semi-crystalline thermoplastic polymer powder, the stimuli imposed on this polymer during PBF processing, and the resultant properties of printed parts (i.e., "property-process-property relationships"). The target polymer, poly(phenylene sulfide), is a high-temperature, high-performance polymer that is traditionally melt processed, but has not yet been commercialized for PBF. Prior literature has established mathematical representation for the interaction between manufacturing energy input and the thermal response of the polymer resulting in melting. This framework has been created through studying the polyamide family. Work presented in this dissertation evaluates existing guidelines for PBF process parameter selection using measured thermal behavior of PPS (i.e., a polysulfide, not a polyamide) to predict the range of manufacturing energies affecting geometrically accurate printed parts of high density and strength. In addition, the impact of thermal exposure from repeated PPS powder reuse over the course of multiple PBF prints was evaluated on powder, thermal, and rheological properties identified as critical for PBF printing. Changes to the molecular structure and properties of reused PPS powder were observed to follow different trends than those reported for other materials traditionally used. The effect of thermal exposure on printed parts was also investigated to determine if the observed changes in molecular structure occurring during thermal exposure of the powder would result in changes to mechanical performance properties of printed parts. The importance of rheological flow properties in dictating printed part performance was observed to be a common theme throughout working with PPS. The final chapter presents a novel method for quantitatively predicting particle fusion during PBF and connecting the extent of particle fusion to mechanical properties of printed parts. The presented method is "polymer agnostic" and advances the state of the art in understanding the physics guiding polymer response to stimuli imposed during PBF AM.
DeBenedictis, Mach Austin. "Model development for the electrostatic fluidized bed powder coating process." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/11326.
Повний текст джерелаKozielová, Silvie. "Studium flexibility a adheze cementových lepidel při různém stupni modifikace polymerním pojivem." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392367.
Повний текст джерелаKunda, N. K. "Dry powder inhalation of pneumococcal vaccine using polymeric nanoparticles as carriers." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4462/.
Повний текст джерелаAgirtopcu, Yasin. "Investigations On The Permeability Of Acrylic Powder Structures." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1045343/index.pdf.
Повний текст джерелаTuli, Rinku. "Studies on the surface properties of biodegradable polymer carriers in respiratory delivery of drug from Dry Powder Inhaler formulations." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/53295/1/Rinku_Tuli_thesis.pdf.
Повний текст джерелаBouscher, Robert F. "Advancements in Powder Coating Processing and in Real-time Film Formation Analysis of Thermoset Coatings." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627566578541715.
Повний текст джерелаAzhdar, Bruska. "Improved high velocity cold copaction processing : polymer powder to high performance parts." Licentiate thesis, KTH, Polymer Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-407.
Повний текст джерелаA uniaxial High-Velocity Compaction (HVC) process for polymer powder using a cylindrical, hardened steel die and a new technique with relaxation assist was tested with a focus on the compactibility characteristics and surface morphology of the compacted materials using various heights of relaxation assist device with different compacting profiles.
Relaxation assist device was presented as a new technique to reduce springback, pull-out phenomenon and to improve the compaction process.
The basic phenomena associated with HVC are explained and the general energy principle is introduced to explain pull-out phenomenon during the decompacting stage. In this study, polyamide-11 powders with different particle size distributions have been compacted with the application of different compaction profiles, e.g. different energies and velocities. It was found that the relative green density is influenced more by the pre-compacting (primary compaction step) than by the post-compacting (secondary compaction step).
Experimental results for different compaction profiles were presented showing the effect of varying the opposite velocity during the decompacting stage and how to improve the homogeneous densification between the upper and lower surface and the evenness of the upper surface of the compacted powder bed by using relaxation assists, and the influences of the relaxation assist device on the process characteristics. It was found that the relaxation assist improves the compaction of the polymer powder by locking the powder bed in the compacted form. In addition, the relative times of the compacting stage, decompacting stage and the reorganisation of the particles can be controlled by altering the height of the relaxation assist. It was found that the high-velocity compaction process is an interruption process and that the delay times between the pressure waves can be reduced by increasing the height of the relaxation assist device. Furthermore, the first gross instantaneous springback and the total elastic springback are reduced.
Two bonding strain gauges and a high-speed video camera system were used to investigate the springback phenomenon during the compaction process. Scanning electron microscopy (SEM) and image computer board Camera (IC-PCI Imaging Technology) were used to the study the morphological characteristics, the limit of plastic deformation and particle bonding by plastic flow at contact points, and pull-out phenomena.
QC 20100506
Neel, Christopher Holmes. "Shock compression of a heterogeneous, porous polymer composite." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34689.
Повний текст джерелаHasheminasab, S. Abed. "Bismaleimide Methacrylated Polyimide-Polyester Hybrid UV-Curable Powder Coating." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586906287945286.
Повний текст джерелаKandis, Mouhyieldin. "Observation and modeling of part growth and shape evolution of polymer parts produced by non-isothermal and laser-induced sintering of powders /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерелаFan, Kin-ming, and 范健明. "Heat transfer properties and fusion behaviour of polymer based composite powders in selective laser sintering." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245286.
Повний текст джерелаNguyen, Hanh. "Surface modification of hydrophobic drugs by adsorption of hydrophilic polymers." Thesis, University of Sunderland, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300329.
Повний текст джерелаAzhdar, Bruska. "Novel Technique to Improve High-Velocity Cold Compaction : Processing of Polymer Powders and Polymer-Based Nanocomposite High Performance Components." Doctoral thesis, Stockholm : Department of Fiber and Polymer Technology, Chemical Science and Engineering, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4133.
Повний текст джерелаYildirim, Ismail. "Surface Free Energy Characterization of Powders." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27525.
Повний текст джерелаPh. D.
Lone, Ashfaq Hussain. "Engineering and durability properties of concrete modified by redispersible polymer powder." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420813.
Повний текст джерелаNugent, Paul James. "A study of heat transfer and process control in the rotational moulding of polymer powders." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317138.
Повний текст джерелаDas, Ajay Kumar. "An investigation on the printing of metal and polymer powders using electrophotographic solid freeform fabrication." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0005385.
Повний текст джерелаElversson, Jessica. "Spray-Dried Powders for Inhalation : Particle Formation and Formulation Concepts." Doctoral thesis, Uppsala University, Department of Pharmaceutical Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5904.
Повний текст джерелаSpray drying is a method with a high potential in the preparation of protein particles suitable for pulmonary delivery. However, surface induced denaturation of bio-molecules during atomization and subsequent drying can be substantial and it is therefore important to develop new formulation concept for concurrent encapsulation and stabilization of proteins during spray drying. Hence, with an overall objective to increase the knowledge of the formation of particulate systems for systemic administration of proteins by spray drying, the first part of this thesis, systematically investigated the particle formation by droplet size and particle size measurements. It was described how specific properties, such as the solubility and the crystallization propensity of the solute, can affect the product, e.g. the particle size, internal structures, and possibly particle density. A new method using atomic force microscopy (AFM) for the assessment of the effective particle density of individual spray-dried particles was demonstrated. In the second part, two different formulation concepts for encapsulation of protein during spray drying were developed. Both systems used non-ionic polymers for competitive adsorption and displacement of protein from the air/water interface during spray drying. The aqueous two-phase system (ATPS) of polyvinyl alcohol (PVA) and dextran, and the surface-active polymers, hydroxypropyl methylcellulose (HPMC) and triblock co-polymer (poloxamer 188) used for in situ coating, proved efficient in encapsulation of a model protein, bovine serum albumin (BSA). Inclusion of polymeric materials in a carbohydrate matrix also influenced several particle properties, such as the particle shape and the surface morphology, and was caused by changes in the chemical composition of the particle surface and possibly the surface rheology. In addition, powder performance of pharmaceutical relevance, such as dissolution and flowability, were affected.
Azhdar, Bruska. "Improved high velocity cold compaction processing : Polymer powder to high performance parts /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-407.
Повний текст джерелаKong, Xiangji. "Development and characterization of polymer- metallic powder feedstocks for micro-injection molding." Phd thesis, Université de Franche-Comté, 2011. http://tel.archives-ouvertes.fr/tel-00844736.
Повний текст джерелаLiu, Xin. "Numerical modeling and simulation of selective laser sintering in polymer powder bed." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI012/document.
Повний текст джерелаMany industrial and academic interests concerning the additive manufacturing processes are developed in the last decades. As one of the most promising technique of additive manufacturing, the Selective Laser Sintering (SLS) has been valued by both industry and academic. However, it remains that several phenomena are still not well understood in order to properly model the process and propose quality improvement of parts made. The goal of this Ph.D. project is to develop a framework of numerical simulation in order to model the SLS process in polymer powder bed, meanwhile understanding multiple physical phenomena occurring during the process and studying the influence of process parameters on the quality of final product. In contrast to traditional approach, based on the equivalent homogeneous material in numerical modeling of partial differential equations derived from conservation laws, we propose a global model to simulate powder-based additive manufacturing by using the Discrete Element method (DEM). It consists in a coupling between four different physical models: radiative heat transfer, discrete heat conduction, sintering and granular dynamics models. Firstly, the submodel of radiative heat transfer concerns the interaction between the laser beam and powder bed. Several phenomena are considered, including the reflection, transmission, absorption and scattering. Besides, a modified Monte Carlo ray-tracing method is developed in order to study the influence of scattering on the distribution of the deposited laser energy inside the powder bed Furthermore, the submodel of discrete heat conduction describes the inter-particles heat diffusion. Moreover, the sintering submodel concerns the phenomena of coalescence and air diffusion. It describes the melting kinetics of grains, driven by surface tension and the release of entrapped gases inside powder bed. Finally, the granular dynamics submodel concerns the motions and contacts between particles when depositing a new layer of powders. The coupling between these submodels leads to propose a global numerical framework, validated by comparing the results to both simulated and experimental ones from literatures. A parametric study is then proposed for model validation and process analysis. The Influence of different material and process parameters on the evolution of temperature, relative density and materials structure and characteristics are investigated. The results exhibit accurate modeling of the complex phenomena occurring during the SLS process, and the work constitute a great potential in modeling and optimization of additive processes
Hupfeld, Tim [Verfasser], and Stephan [Akademischer Betreuer] Barcikowski. "Nanoparticle-functionalized polymers for laser powder bed fusion / Tim Hupfeld ; Betreuer: Stephan Barcikowski." Duisburg, 2021. http://d-nb.info/1237221455/34.
Повний текст джерелаGrosvenor, Martin Paul. "The physico-mechanical properties of electrostatically deposited polymers for use in pharmaceutical powder coating." Thesis, Online version, 1991. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.303452.
Повний текст джерелаSchultz, Jeffrey Patrick. "Modeling Heat Transfer and Densification during Laser Sintering of Viscoelastic Polymers." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11091.
Повний текст джерелаPh. D.
Yarmolenko, O. V., A. V. Yudina, G. Z. Tulibaeva, A. V. Cherniak, V. I. Volkov, and A. F. Shestakov. "Influence of Inorganic Nano-powders on the Structure and Conductive Properties of the Network Polymer Electrolytes for Lithium Batteries." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35511.
Повний текст джерелаKowalski, Sebastian. "Rheology based investigation of a polymer-mineral powder mix for low pressure injection moulding." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/80dadd89-fb07-4918-8b88-5fd642b79cac/blobholder:0/2005LIMO0015.pdf.
Повний текст джерела. The rheological properties of a ceramic paste, comprising several immiscible polymers : paraffin wax, EVA, carnauba wax, mixed with a mineral submicronic powder were investigated at 130°C. It is a prerequisite to master a forming process such as injection moulding and this was one of the pursued objectives. The other one was to relate these properties to the physico-chemical composition. Several parameters were modified i. E. - the vol. Solid fraction, the polymer blend composition and the nature of the powder. It was proved that EVA and carnauba molecules adsorb on ZrO2 surface, in a volume ratio 2/1 and the powder makes inclusions in the liquid paraffin. For a vol. Fraction >50%, a solid-liquid transition occurs - paste shows a thixotropic behaviour-analyzed with a model developed by Piau. A capillary rheometer was used to estimate the extensional viscosity, which is very sensitive (contrary to shear viscosity), and clearly related to the amount of adsorbed EVA
Sajja, Mani Bhushan. "Eco-friendly paving blocks from alkali-activation of basalt powder." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Знайти повний текст джерелаCano, Camilo I. "Polyimide Microstructures From Powdered Precursors: Phenomenological and Parametric Studies on Particle Inflation." Akron, OH : University of Akron, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1123710711.
Повний текст джерела"August, 2005." Title from electronic dissertation title page (viewed 09/24/2005) Includes bibliographical references.
Shen, Yubin. "The chemical and mechanical behaviors of polymer / reactive metal systems under high strain rates." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45804.
Повний текст джерелаOtto, Christian [Verfasser], and Volker [Akademischer Betreuer] Abetz. "Electrically Conductive Composite Materials from Carbon Nanotube Decorated Polymer Powder Particles / Christian Otto ; Betreuer: Volker Abetz." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1150183748/34.
Повний текст джерелаJankech, Filip. "Elastomerní plniva jako potencální surovina pro betony a malty." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-295668.
Повний текст джерелаJaníček, Vít. "Studium vlhkostně-transportních vlastností polymer-cementových stěrek pro vnější kontaktní zateplovací systémy budov." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392337.
Повний текст джерелаWestbeld, Julius. "Investigation of support structures of a polymer powder bed fusion process by use of Design of Experiment (DoE)." Thesis, KTH, Lättkonstruktioner, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243867.
Повний текст джерелаI detta examensarbete undersöks stödstrukturer för en polymer-pulverbaserad process kallad XXXXXXXX. Dessa strukturer är väsentliga för de flesta aditiv tillverkning. Med hjälp av metoden "Design of Experiment" (DoE) undersöks effekten av flera faktorer på fem industriellt viktiga egenskaper för stödstrukturer. DoE beskriver både planeringen och analysen av experiment. Experimenten planeras i en fraktionerad faktoriell 211-5 design med 64 provexemplar vilket resulterar i en upplösning av IV. Dataanalysen genomförs med hjälp av ANOVA-metoden, med vilken signifikansen av effekter och interaktionseffekter kan undersökas.
Muhsin, Mohammad Didare Alam. "Preparation and in vitro evaluation of a polymer based controlled release dry powder inhaler formulation for pulmonary delivery." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/71806/1/Mohammad%20Didare%20Alam_Muhsin_Thesis.pdf.
Повний текст джерелаZakharova, K., A. Mednikova, V. Rumyantsev, and T. Genusova. "Synthesis of Boron Carbide from Boric Acid and Carbon-Containing Precursors." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35601.
Повний текст джерелаLambrechts, Jacobus Johannes. "Investigation into the influence of different Kollidon® polymers on the properties of powder mixtures intended for tableting / Jacobus Johannes Lambrechts." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2877.
Повний текст джерелаThesis (M.Sc. (Pharmaceutics))--North-West University, Potchefstroom Campus, 2009.
Subianto, Surya. "Electrochemical synthesis of melanin-like polyindolequinone." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16427/1/Surya_Subianto_Thesis.pdf.
Повний текст джерелаSubianto, Surya. "Electrochemical synthesis of melanin-like polyindolequinone." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16427/.
Повний текст джерелаZhuang, Rong-Chuan. "Synthesis of polymers and oligomers containing fluorinated side groups for the construction of hydrophobic surfaces." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1120215670616-23184.
Повний текст джерелаCommon, Audrey. "Développement d'un procédé propre assisté par CO2 supercritique pour la production de particules de polyamide : caractérisation et faisabilité." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0113/document.
Повний текст джерелаPolymer powders are widely used in industry and are traditionally manufactured by processes using organic solvent or by grinding low molecular weight polymers with a post-polymerization step. This thesis aimss at the generation of polymer powders with a single-step continuous process, based on the use of supercritical CO2, hence without organic solvent. Before developing this process, the characterization of the mixture CO2/polymer was done. Solubility measurements were carried out and fitted with the Sanchez-Lacombe equation of state. Moreover, a capillary rheometry technique was implemented on-line, allowing the measurement of the viscosity of the polymer alone or in mixture with CO2, under process conditions. The modeling of swelling as a function of time led to the evaluation of the diffusion coefficient of CO2 into the polymer. Afterwards, two experimental devices were designed. A batch process with a pressurized autoclave was used to determine the influence of experimental parameters on powder production, with small amounts of material. Formation of small fibrous particles was obtained. In parallel, the continuous process was studied on an extruder adapted to CO2 introduction and equipped with mixing devices. This study, which led to foam manufacture, was used to evaluate efficiency and homogeneity of the mixing. Residence time distributions were determined by Raman spectroscopy on the die in order to evaluate the flowing in the extruder under different conditions. The equipment was also fitted with a specific nozzle allowing co-injection of hot air. Production of fibrous particles with two different size ranges was obtained
Machado, Jaison Carlosso. "Desenvolvimento e controle de qualidade de micropartículas poliméricas contendo praziquantel para o tratamento pediátrico da esquistossomose." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/181180.
Повний текст джерелаSchistosomiasis is a parasitic disease acute and chronic caused by blood worms (nematodes worms) of the genus Schistosoma. Man acquires schistosomiasis through the active penetration of the worms in skin. The importance of treatment of this disease is not only the fact of curing the disease or decreases the parasite load of patients, well as prevent progression to more severe forms. For the treatment of schistosomiasis praziquantel is the drug of choice, this is due to its wide spectrum, its efficacy, safety and the relation cost / treatment. The single dosage form available in Brazil is tablet at a dose of 600 mg, which can be subdivided into four parts of 150 mg to facilitate dose adjustment. However when the subdivision of the tablets occurs the disruption of the coating. This fact provides a drug exposure and consequently of its bitter taste. This characteristic complicates the administration of the drug mainly in children, affecting the treatment and control of disease. An alternative for this problem is the development of microparticulate polymeric systems which associated with the drug would prevent direct contact with the taste buds and thus promote an improvement in palatability. For this was used a modified technique interfacial deposition of preformed polymer followed by spray drying. Three polymer matrices with different release characteristics have been used, Eudragit RL 100 – time dependent release, and Eudragit E100 and L30D-55 – pH dependent release. Furthermore, two types of drug carrier systems have been prepared, polymeric microspheres and microcapsules. These systems obtained were evaluated and characterized in order to select the best proposal formulation aimed at masking the taste of the drug. According to the results we selected a system comprising microcapsules formed from L30D-55 polymer. From then was inserted into this system in the pharmaceutical form, powder for oral suspension, where different proposals formulations containing two auxiliary sweeteners, aspartame and saccharin, separately, and their respective placebos were evaluated in an in vitro method for determining the taste, the electronic tongue. The different formulations tested presented excellent ability to mask the unpleasant taste of the drug and thus present an excellent alternative for increasing adherence to therapy, especially for children, because of the ease of administration, according on dose adjustment of body mass and the much more palatable to children's taste.
KIYAN, LUDMILA de Y. P. "Aplicação da radiação gama para incorporação do pó de borracha em formulações de borracha EPDM e nitrílica." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23177.
Повний текст джерелаMade available in DSpace on 2014-12-19T17:14:06Z (GMT). No. of bitstreams: 0
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP