Дисертації з теми "Copolymers Electric properties"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-24 дисертацій для дослідження на тему "Copolymers Electric properties".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Henderson, Paul Thomas. "Thiophene : alkylthiophene copolymers from substituted oligothiophenes." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/30555.
Повний текст джерелаTan, Kam Ho. "Synthesis and electrical properties of copolymers and blends of polyacetylene via poly(phenyl vinyl sulfoxide) precursor." HKBU Institutional Repository, 1992. http://repository.hkbu.edu.hk/etd_ra/16.
Повний текст джерелаBriceno, Garcia Ruben Dario. "Crosslinking of ethylene copolymers from epoxy chemistry." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0037.
Повний текст джерелаMost of insulation layers of cables for medium voltage “MV” and high voltage “HV” applications are made of crosslinked polyethylene (XLPE) by peroxide technology. The impact of reaction by-products on properties and the consequential need of a degassing stage during the process are the main problems related to this technology. This study focuses on the development of an alternative crosslinking method without by-products issues. Epoxy-ethylene copolymers were thermally crosslinked by using an amino-acid agent to create covalent cross-links between epoxide functions. Influence of several parameters on kinetic reactions such as crosslinking temperature, amino acid/epoxy proportions, size particle of amino acid and epoxy content in copolymers were studied by characterization techniques such as: dynamic rheology, FTIR spectrometry, SEM microscopy and differential calorimetry. In addition, study of the network structure before and during a thermal aging was done on a pre-constrained and a non-constrained network by different techniques (swelling ratio measurement, FTIR spectroscopy, tensile properties and thermoporosimetry analysis). Finally, a characterization of electrical properties by dielectric spectroscopy and breakdown measurements was done. Results related to reaction kinetic, thermo-mechanical properties and electrical behavior have shown that the developed formulation can be used for cable application
Lightfoot, Philip Kenneth. "The preparation, properties and structure of poly-p-xylyene and its copolymers." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302158.
Повний текст джерелаRyan, Kevin J. "Properties of PEG, PPG and their copolymers influence on the gap-fill characteristics of damascene interconnects." Thesis, State University of New York at Albany, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3566568.
Повний текст джерелаA laboratory scale plating cell was built that provided reproducible bottom-up fill results for the electrochemical deposition of copper in damascene features. Several techniques used in the full wafer plating tool were incorporated into the setup to accurately control the process conditions. These techniques included but were not limited to a voltage controlled `hot-entry' step, a custom coupon holder to allow sample rotation, a secondary thief electrode and an automatic entry system. The results of qualification experiments are presented to demonstrate that precise control was realized along with repeatable partial fill plating results. The qualified setup was then used to perform time-evolved partial fill plating experiments using several different structural configurations of open-source suppressors to investigate their affect on the gap-fill characteristics.
Common open-source suppressors used for copper filling of damascene interconnects include polyethylene glycol (PEG), polypropylene glycol (PPG), or a copolymer structure of both. Differences in the configuration and structure of these suppressors generate variations in polarization strength, surface adsorption rate, and SPS displacement rate. These properties were measured by electrochemical transient analysis and coupled with the results of time-evolved partial fill plating experiments to determine the effect of electrochemical property variations on the gap-fill characteristics. The high polarization strength of PPG, along with its greater dependence on concentration was found to greatly increase the bottom-up growth rate during copper filling, while the improved resistance to accelerator displacement of PEG resulted in better sidewall protection. Both these gap-fill characteristics were evident when PEG and PPG were combined together as a mixture of separate homopolymers or in copolymer structures, although the overall influence was dependent on the size and configuration of each component. These data sets provided a more fundamental understanding of PEG, PPG and their different configurations role in the metallization of damascene interconnects. These data can also be used to infer the relative gap-fill performance to screen new suppressor candidates and reduce the quantity of plating experiments by comparison of the electrochemical properties.
Metera, Kimberly Lorrainne 1976. "Self-assembly, luminescence properties and excited state interactions of block copolymers that contain ruthenium tris(bipyridine)." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111909.
Повний текст джерелаThe solution self-assembly of block copolymers that contain Ru(bpy) 32+ complexes was examined first. Using a series of these block copolymers, a detailed study of the effects of block length, block ratio, polymer concentration and solution conditions on the copolymer self-assembly is presented. Using TEM, a number of morphologies were reproducibly observed including star micelles, large compound micelles, tubules, and interestingly, vesicles. These structures all contain the metal complex Ru(bpy)3 2+ within their core domains.
The luminescence properties of two block copolymers containing Ru(bpy) 32+ were examined: one polymer self-assembled into star micelles, the other into vesicles. Comparison of the unassembled polymer chains and the self-assembled polymers indicated that self-assembly, and confinement of the Ru(bpy)32+ complexes into the core domains of the aggregates, did not seriously adversely affect the luminescence properties of the metal complex. Measurement of the luminescence lifetime decay of the polymers suggested that energy migration occurred among the metal complexes along the polymer chain. The ability of the metal complexes within self-assembled structures to participate in electron transfer reactions with small molecules was also explored. It was found that from within the core domains of self-assembled structures, the Ru(bpy)32+ complexes could still engage in electron transfer reactions with molecules on the outsides or the insides of the aggregates, likely a result of energy migration.
The ability of Ru(bpy)32+ complexes within the cores of micelles to participate in energy transfer was explored. Micelles were formed in aqueous solutions using polymers that possessed both the metal complex and a water-soluble block. Several methods were attempted to encapsulate two molecules, a derivative of coumarin 2 and an Os(bpy)3 2+-based molecule, inside these micelles. It was observed that Ru(bpy) 32+ could act as an energy acceptor from the coumarin derivative, and could act as an energy donor to the osmium-based complex. Encapsulation of the small molecules greatly enhanced the efficiency of energy transfer, by non-covalently bringing the small molecules in close proximity to the Ru(bpy)32+ complexes.
Polymers were synthesized that contained a Ru(bpy)3 2+-based block and were terminated with the molecular recognition unit biotin. These polymers, upon self-assembly, formed micelles with biotin groups on their periphery. The addition of the protein streptavidin, which has a strong binding affinity for biotin, resulted in the aggregation of the self-assembled structures. This established the potential for self-assembled metal-containing aggregates to form higher-order structures.
Early work is presented in Appendix A involving block copolymers that contain hydrogen-bonding groups. Several methods were attempted to elucidate the solution morphologies of these polymers, namely IR, 1H NMR, DLS, and pyrene fluorescence. The transition of this initial work to polymers that contain the Ru(bpy)32+ complex is also described.
POVEDA, PATRICIA N. S. "Estudo do efeito da radiação por feixe de elétrons nas propriedades de filmes de copoliester alifático aromático." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11510.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:02:59Z (GMT). No. of bitstreams: 0
Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
Fragneaud, Benjamin Cavaillé Jean-Yves Terrones Maldonado Mauricio Gonzalez Montiel Alfonso. "Synthesis and characterization of polymer/carbon nanotubes composites impact of polymer grafting on the surface of CNx MWNTs on the electrical and mechanical properties of the nanocomposites /." Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=fragneaud.
Повний текст джерелаDi, Pietro Riccardo, Tim Erdmann, Naixiang Wang, Xuhai Liu, David Gräfe, Johannes Lenz, Josef Brandt, et al. "The impact of molecular weight, air exposure and molecular doping on the charge transport properties and electronic defects in dithienyldiketopyrrolopyrrole- thieno[3,2-b]thiophene copolymers." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36273.
Повний текст джерелаSchmidt, Georg C., Daniel Höft, Katherina Haase, Arved C. Hübler, E. Karpov, R. Tkachov, M. Stamm, et al. "Naphtalenediimide-based donor–acceptor copolymer prepared by chain-growth catalyst-transfer polycondensation: evaluation of electron-transporting properties and application in printed polymer transistors." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-146244.
Повний текст джерелаDieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Fragneaud, Benjamin. "Synthesis and characterization of polymer/carbon nanotubes composites : impact of polymer grafting on the surface of CNx MWNTs on the electrical and mechanical properties of the nanocomposites." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0124/these.pdf.
Повний текст джерелаADes nouveaux matériaux hybrides, provenant du greffage de polystyrène à la surface de nanotubes de carbone dopés azote (CNx MWNTs) ont été synthètisés et utilisés dans l’élaboration de nano-composites à matrice polymère. Dans ces travux de recherche nous avons étudiés l’impacte de ces nanotubes de carbone greffés polystyrène sur les propriétés mécaniques et électriques de matrices polystyrène (PS et poly (butadiène-co-styrène) (PSBS). Les nanotubes greffés ont une meilleure dispersion dans une matrice de polystyrène que les nanotubes sans traitement chimique. Cependant, ce type de fonctionnement ne permet pas de baisser le seuil de percolation électrique, puisque le greffage tend à isoler électriquement les nanotubes. Par ailleurs, nous avons observé une sensible augmentation de l’effet de renfort mécanique de la matrice PS quand les tubes sont greffés ; particulièrement quand les composites sont soumis à de grandes déformations. Dans le cas particulier d’une matrice nano structurée comme le PSBS, nous avons observé un effet de renfort mécanique beaucoup plus important quand les nanotubes étaient greffés. En effet, la couche de PS à la surface des CNx MWNTs connecte les domaines de PS du copolymère, permettant l’apparition d’un réseau percolant rigide avec un seuil de percolation très bas (PC <0. 05 vol%)
Voit, Walter Everett. "Optimization of mechanical properties and manufacturing techniques to enable shape-memory polymer processing." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37136.
Повний текст джерелаThevenot, Camille. "Élaboration de membranes polymères piézoélectriques souples en vue d’applications biomédicales." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0197/document.
Повний текст джерелаThe work presented here focuses on the preparation of a piezoelectric polymer material aimed to be the sensitive element of a strain sensor of biological tissues. This includes the study of the softening of the copolymer P(VDF-TrFE) necessary to be close of the mechanical properties of an artery, without reducing the piezoelectric coefficient. Plasticized P(VDF-TrFE) films with diethyl phthalate (DEP) were made according to different protocols including doctor blade technique or spin-coating and polarization under high voltage to activate the ferroelectric properties. Depending on the preparation conditions, two distinct structures were obtained with physical properties specific to each of them. For the first type of film, the study of the morphology and the hysteresis loops polarization-electric field showed a new structure of the material, with a demixing of the plasticizer in the matrix. In this case, the coercive field is strongly reduced which allows a decrease of the required high polarization voltage up to 40%, even if the film only contains 50wt% of P(VDF-TrFE). The second type of film, obtained after an annealing at lower temperature, has an almost homogeneous structure and properties close to a mixing law. The coercive field remains comparable to that of the pure P(VDF-TrFE) but the flexibility of the material is greatly increased. The study of the mechanical properties showed that the plasticizer can reduce the Young modulus to 40MPa for 30wt% of DEP in the film. In addition, the remanent polarization and the piezoelectric coefficient are also reinforced. In vitro and in vivo experiments, performed on arteries, of sensors based on these films demonstrated the high potential of the material to detect the strain of soft tissues and to function at biologic human frequencies
Hsieh, Li-Ga, and 謝澧佳. "Synthesis and Electroluminescence Properties of Novel Fluorine-based Copolymers Containing Electron-Donor and Acceptor Moieties." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/3q2ccy.
Повний текст джерела國立臺北科技大學
化學工程研究所
96
Polyfluorene is a well known hole-transporting material with high mobility. Attempts have been made to improve the electron-transport and hole-transport properties of polyfluorenes by introducing electron-donor and electron-acceptor moieties, respectively. In part A, we synthesized two fluorene-based copolymers through the incorporation of electron donor triphenylamine and electron acceptor 1,2,4-triazole moieties group into the polymer backbone. The PTPATAZ-F8 and PTAZTPA-F8 copolymers exhibited good thermal stability with 5% loss weight temperature of 403℃ and 411℃, and the glass transition temperatures of 135℃ and 185℃, respectively. The emission maxima of copolymer films on the photoluminescence spectra were 413-435 nm, which corresponded to blue color. From electrochemical results, PTPATAZ-F8 containing triphenylamine main chain showed high ionization potential(HOMO=-5.31) than PTAZTPA-F8(HOMO=-5.72). Electroluminescence device with the configuration of ITO/PEDOT:PSS/ PTPATAZ-F8/LiF/Al was fabricated to evaluate the potential EL application. The device using PTPATAZ-F8 as the active layer showed EL performance with max emission band at 444nm and turn-on voltage at 6V. The maximum luminance was 84 cd/m2 and the maximum luminance efficiency was 0.044 cd/A. The CIE’ 1937 coordinate was located at(0.160, 0.130). In part B, we used the monomers in port A through the incorporation electron acceptor 2,1,3-benzothiadiazole into the polymer backbones. The PTPATAZBT-F8 and PTAZTPABT-F8 copolymers exhibited good thermal stability with 5% loss weight temperatures of 433℃ and 406℃, and the glass transition temperatures of 155℃ and 153℃, respectively. The emission maxima of copolymer films on the photoluminescence spectra were 541-547 nm, which corresponded to yellow-green color. From electrochemical results, the HOMO level of PTPATAZBT-F8 and PTAZTPABT-F8 showed the same as part A. The device using PTPATAZBT-F8 as the active layer showed best EL performance with max emission band at 542nm and turn-on voltage at 5V. The maximum luminance was 696 cd/m2 and the maximum luminance efficiency was 2.02cd/A. The CIE’ 1937 coordinate was located at(0.345, 0.625).
Sommer, Michael [Verfasser]. "Novel semiconductor block copolymers for organic electronic devices : synthesis, properties and applications / vorgelegt von Michael Sommer." 2009. http://d-nb.info/997939192/34.
Повний текст джерелаWang, Chia-Tien, and 王佳田. "The study on Physical Properties and Electronic Properties for Novel Cyclo Olefin Copolymer / Cationic Photo Initiator Proton Exchange Membrane." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/y459dg.
Повний текст джерела國立臺灣科技大學
高分子系
95
This paper explores the applicability of blended cyclo olefin copolymer films containing doping cationic photo initiator in the direct methanol fuel cell operating environment. Experimental tensile strength measurements were used to analyze the dynamic properties of the films, and yielded the finding that dynamic response fell with increasing concentration of photo initiator. A scanning electron microscope was used to perform state observations and elemental analysis; it was found that the ratios of the elements iodine, sulfur, and fluorine increased after illumination, but decreased sharply after water washing. A thermo gravimetric analyzer was used to observe the thermal decomposition process of blended films, and revealed that the decomposition temperature of the film was as high as 460°C, while the photo initiator had a decomposition temperature of 250°C. This indicates that blended films have sufficient thermal stable for use in direct methanol fuel cell systems. Use of an AC resistance meter revealed that both conductance and moisture content increased as photo initiator was added. This shows that addition of a photo initiator can help increase proton transmission properties. The conductance and moisture content of a test plate also both increased after illumination. As for methanol permeability, the ASTM E96 steam permeability test method was used to measure the diffusion of fumes from a methanol-water solution in the film. In addition, an Abbe refractometer was used to measure the concentration of the methanol-water solution used in the previous experiment and gain a better understanding of the film's ability to block methanol molecules. It was found that the diffusion of methanol-containing steam decreases with increasing photo initiator concentration, and also shown that the concentration of the methanol-water solution remaining after the experiment increases with photo initiator concentration. It was revealed that test plates with high photo initiator concentration have good ability to block methanol molecules. Finally, test plates were uniformly better able to block both methanol molecules and steam containing methanol after illumination.
Σφήκα, Βασιλική. "Πρότυπα αμφίφιλα συμπολυμερή τριών συστάδων: φαινόμενα διασύνδεσης". Thesis, 2003. http://nemertes.lis.upatras.gr/jspui/handle/10889/3462.
Повний текст джерелаCosta, Pedro Filipe Ribeiro. "Development of mechanical, electrical and electromechanical properties of copolymer styrene-butadiene-styrene with carbon nanotubes composites." Doctoral thesis, 2013. http://hdl.handle.net/1822/28779.
Повний текст джерелаComposites are an important class of materials as they allow to reinforce or to include specific properties not typically found in nature. In this way, suitable electromechanical materials allow the measurement of large deformations by electrical means can be achieved by the development of composites. Research in electromechanical composites has been based in several polymer matrices with carbon nanoallotropes to increase the electrical conductivity of the composites. Successful development of electromechanical transducer materials has been accomplished, but reliable solutions for the development of large deformation sensors are still to be developed to meet the increasing industrial needs. This work is focused on the study of the electromechanical response of carbon nanotubes/thermoplastic elastomers (CNT/TPE) composites with the main goal of maximizing sensitivity and deformation (> 30%) in order to improve the application range of the composites for sensor applications. The composite materials used in these work are four different tri-block copolymers styrene-butadiene-styrene (SBS) (with reference C401, C411, C500 and C540) where the block copolymer structure is linear or radial and butadiene/styrene ratio ranged between 80/20 to 60/40. The composites materials are prepared by three different processing methods: solvent casting, extrusion and electrospinning. The amount of CNT included in the composites prepared by the different processing methods are 0, 1, 2, 4 and 8 weight percentage (wt%) for solvent casting, 0, 2, 4, 6, 8 and 10 wt% for extruded composites and 0, 0.05, 0.1 and 0.5 wt% for electrospun composites. It was important to find the electrical percolation threshold to obtain suitable electromechanical responses for sensors applications. Different types of CNT such as single walled CNT (SWCNT) and multi walled CNT (MWCNT) were used to study electrical and electromechanical properties of the composites. Chemical treatment of the CNT was also performed to understand the effect of functionalization on CNT dispersion and in the electromechanical response of the CNT/SBS composites. Covalent and non-covalent functionalization on MWCNT has been used for filler concentrations up to 8 wt%. SBS shows maximum strain larger than 1000% both for pure SBS and the both composites prepared by solvent casting and extrusion. On the other hand, composites prepared by electrospinning show a maximum strain of 350%. The ratio of butadiene/styrene in the copolymer and the different copolymer architecture mainly influences the mechanical properties. Initial modulus is larger for matrices with higher amounts of styrene and for CNT/SBS composites increases with increasing CNT content, independently of the composite processing method. Mechanical hysteresis of the composite increases with applied strain (from 5% to 20%) and decreases with increasing the number of stress-strain cycles. Softer matrices (higher amount of butadiene) have lower mechanical hysteresis than harder matrices (higher amounts of styrene), demonstrating the influence of the butadiene/styrene ratio on the mechanical properties of the composites. Morphological evaluation of the composites shows well dispersed clusters of CNT inside SBS matrices for pristine CNT and individual dispersion of functionalized CNT within the SBS matrices. The percolation theory concludes that hopping between nearest fillers is considered as the main mechanism for the composite electrical conduction, the overall composite conductivity is explained by the existence of a weak disorder regime. The amount of pristine CNT inside the SBS matrix improves electrical properties of the composites, the electrical percolation threshold being lower than 1 wt% CNT for composites prepared by solvent casting and electrospinning processing methods, increasing up to 4-5 wt% CNT content for extruded composites. Composites with covalent and non-covalent functionalization, do not present electrical percolation threshold for filler contents up to 8 wt% CNT, where conductivity remains similar to pure SBS matrix. The electromechanical properties of the composites depend on composite fillers content, CNT functionalization state and processing methods. Uniaxial strain and 4-pointbending measurements for solvent casting composites show larger electromechanical response for all matrices with maximized sensibility after initial pre-stress. The Gauge Factor (GF) for solvent casted composites with 4 wt% CNT filler content can reach values of GF~120 for C540 samples under uniaxial strain and GF~100 for C401 samples under 4-point-bending mechanical solicitation. For extruded composites with 8 wt% CNT, they reach a value of ~30 for C401 SBS under uniaxial strain. The maximum deformation with suitable electromechanical response can reach 50% of strain. The proof of concept of the composites for sensor applications has been performed with the development of a glove with finger movement monitoring.
Compósitos são atualmente uma importante classe em materiais e possibilitam obter propriedades únicas não presentes na natureza. Seguindo esta ideia, podem ser desenvolvidos materiais com propriedades electromecânicas para medir grandes deformações mecânicas através da resposta elétrica. A procura destes compósitos eletromecânicos é baseada em diversas matrizes poliméricas com o reforço dos diversos nanomateriais carbonáceos. O presente trabalho é focado no estudo da resposta eletromecânica de compósitos nanotubos de carbono/termoplásticos elastómeros tendo como objectivo principal maximizar a sensibilidade eletromecânica e a deformação (> 30%), alargando o leque de aplicações destes compósitos. Os materiais utilizados neste trabalho são quatro diferentes copolímeros de estirenobutadieno- estireno (com a referencia C401, C411, C500 e C540), utilizados como matriz, tendo o copolímero estrutura linear ou radial e rácio butadieno/estireno varia entre 60/40 e 80/20. Como material de reforço são usados três diferentes tipos de nanotubos de carbono, de parede simples ou múltipla com a referência C150P, NC7000 e AP-SWNT. Os compósitos foram preparados por três métodos: a partir da dissolução num solvente, por electrospinning e extrusão. A quantidade, em massa, de nanotubos de carbono presente nos compósitos foi de 0, 1, 2, 4 e 8% para o processamento a partir da solução, de 0, 2, 4, 6, 8 e 10% para o processamento por extrusão, e de 0, 0.05, 0.1 e 0.5% para os materiais processados por electrospinning. As várias concentrações foram utilizadas de forma a determinar o limite de percolação elétrico dos compósitos, de forma a otimizar a resposta eletromecânica destes. Os nanotubos de carbono também foram alvo de funcionalização, covalente e não-covalente, com o intuito de entender a evolução das propriedades dos compósitos com os diferentes nanotubos e funcionalizações destes. Compósitos até 8% em massa de nanotubos foram processados a partir de um solvente com nanotubos de carbono funcionalizados. As matrizes poliméricas apresentam excelentes propriedades mecânicas com a deformação máxima a variar entre 350% para os materiais processados por electrospinning e mais de 1000% para os compósitos preparados com os restantes tipos de processamento. O rácio butadieno/estireno influencia essencialmente as propriedades mecânicas e o módulo elástico aumenta com a quantidade de estireno e de nanotubos de carbono na matriz, independentemente do processamento utilizado. A histerese mecânica aumenta com a deformação e diminui com o número de ciclos tensãodeformação aplicados no compósito, sendo maior para as matrizes com maior quantidade de estireno no copolímero. A morfologia dos compósitos é similar para os nanotubos de carbono sem tratamento, apresentando uma boa dispersão de agregados de nanotubos de carbono. Os compósitos com os nanotubos de carbono funcionalizados apresentam uma dispersão individual de nanotubos de carbono em vez de uma dispersão de agregados. A teoria da percolação mostra que o hopping entre os nanotubos vizinhos é considerado o principal mecanismo de condução elétrica no compósito, e a condutividade total do compósito pode ser explicada pela existência de um regime de fraca desordem. O aumento de nanotubos de carbono não funcionalizados na matriz polimérica melhora as propriedades elétricas do compósito sendo o limite de percolação elétrico menor que 1% em massa para os compósitos processados a partir do solvente e por electrospinning e cerca de 4-5% para os compósitos processados por extrusão. Os compósitos usando nanotubos de carbono funcionalizados não apresentam percolação elétrica. As propriedades eletromecânicas do compósito dependem da quantidade de nanotubos de carbono na matriz e do método de processamento. As medidas para a deformação unidireccional e a flexão de 4 pontas para compósitos processados a partir de solução no solvente apresentam uma boa resposta eletromecânica para as quatro matrizes poliméricas, tendo a sua sensibilidade maximizada após pré-deformação. O Factor de Gauge para os compósitos com 4%, em massa, de nanotubos de carbono é cerca de 120 e 100 para a matriz C540 medida pelo método de deformação unidireccional e de flexão de 4 pontas, respectivamente. Para compósitos processados por extrusão, com 8% em massa, o Factor de Gauge máximo é cerca de 30, para a matriz C401 medido na deformação unidireccional. A deformação máxima com uma boa resposta eletromecânica é de 50% nestes compósitos. A prova de conceito da utilização destes compósitos para aplicações de sensores foi realizada através do desenvolvimento de uma luva com a monitorização do movimento dos dedos.
Lin, Yung-Chou, and 林永洲. "Synthesis, Characterization, and Opto-electronic Properties of Donor-Acceptor Conjugated Copolymer Based on Poly-3-octylthiophene Derivatives." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/43139325637936060323.
Повний текст джерела國立中央大學
化學研究所
92
Abstract A novel series of conjugated copolymers comprising alternating π-excessive alkylthiophene (or bis(3-octylthiophene)) and π-deficient 2,6-pyridine (or 3,8- phenanthrolin) moieties were synthesized using a palladium-catalyzed Stille coupling reaction or Nickel-catalyzed Suzuki coupling reaction. They are characterized by 1H-NMR, FT-IR, ESCA, EA, gel permeation chromatography(GPC), thermogravimetric analysis(TGA), differential scanning calorimeter (DSC), UV-Vis absorption, fluores- cence spectroscopies, and time-resolved photoluminescence spectroscopy (TR-PL). These copolymers were highly soluble in common organic solvents and showed good thermal stability. The electronic and optical properties of these copolymers were closely related to the structures of the polymer backbone. Copolymers containing 2,6-pyridine or 3,8- phenanthrolin moieties not only exhibited blue shifts in UV-Vis absorption and fluorescence spectra but also enhanced the quantum yield significantly compare to their thiophene analogues. The λmax of poly-3-octylthiophene derivatives underwent a blue shift and intensity decreasing with increasing temperature. This thermochromic behavior was reversible. The quantum efficiency of copolymers containing 3,8- phenanthrolin increased with increasing solvent polarity, from less polar toluene to highly polar NMP. TR-PL spectra revealed that copolymers contained pyridine moiety will have a longer life time and therefore higher quantum efficiency. A single layer PLED devices was fabrication by using POTPyOT as a luminescence layer demonstrated that these novel copolymers might be promising materials for applications in light-emitting diodes.
Mukhopadhyay, Tushita. "Studies on Correlation between Microstructures and Electronic Properties of Organic Semiconductors." Thesis, 2017. http://etd.iisc.ernet.in/2005/3794.
Повний текст джерелаHuang, Yu-Tang, and 黃郁棠. "The Study of Electrical and Optical Properties ofSemiconductive Polymer in Organic Thin Film Transistors Aligned with Nano-grooved Block Copolymer Template." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46583723643933055408.
Повний текст джерелаChuang, Ching-Heng, and 莊靖恆. "Morphology and Electronic Properties of Semiconducting Polymer and Branched Polyethylene Blends and the synthesis of Self-Healing and elastic random copolymer." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8wkqrq.
Повний текст джерелаWang, Jen-Fu, and 王仁甫. "PART A: Theoretical Analysis on the Geometry and Electronic Properties of Acceptors-based Poly(heteroarylene methine)sPART B: Synthesis and Characterization of New Fluorene-based Donor-acceptor-Donor Alternating Copolymers for Transistor Applications." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/23582947253974714246.
Повний текст джерела國立臺灣大學
高分子科學與工程學研究所
94
Abstract The electronic structures and electronic properties of conjugated polymers have been tuned by modifying the chemical structures in many studies for specific aims. In this study, we divide two parts to discuss: (A) theoretical analysis on the geometries and electronic properties of acceptors-based poly(heteroarylene methine)s, and (B) synthesis the fluorene-based copolymers with donor-acceptor-donor systems(1:1) and their application on the thin-film transistors. In the PART A of this study, a comprehensive understanding on the relationship between theoretical geometries and electronic properties of acceptor-based poly(heteroarylene methine)s was explored by the density functional theory (DFT) at the B3LYP level with 6-31G basis set. The optimized geometries: bond length alternation and dihedral angle were investigated and correlated with the electronic properties: HOMO, LUMO, band gap and bandwidth. The results suggested that poly(heteroarylene methine)s had smaller band gap relative to the their homopolymers, due to the coexistence of aromatic and quinoid form and the lower LUMO energy levels. The geometries of these poly(heteroarylene methine)s were significantly affected by the fused ring size, side groups, and heteroatoms. The electronic properties of HOMO, LUMO, band gap and bandwidth were significantly controlled by the dihedral angle, bond length alternation, and the acceptor strength. The smaller bond length alternation and stronger acceptor strength result in the smaller band gap. In the PART B of this study, we synthesize the fluorene-based donor-acceptor-donor copolymer for thin film transistor applications. The copolymer was synthesized through the palladium-catalyzed Suzuki coupling reaction. The optical and electrochemical properties of PFO-DTTP determined by UV-vis and CV suggest small band gaps of 1.82 and 1.67 eV, respectively, due to the strong intramolecular charge transfer. Beside, the thin film transistor device fabricated by PFO-DTTP in DCB has field-effect mobility of 1.38*10-5 cm2/(Vs) and the maximum on/off ration observed of 5.91*103, which is slightly higher than the common TFT materials of F8T2. It suggests the significance of intramolecular charge transfer on the transistor characteristics.
Jen-Fu, Wang. "PART A: Theoretical Analysis on the Geometry and Electronic Properties of Acceptors-based Poly(heteroarylene methine)s PART B: Synthesis and Characterization of New Fluorene-based Donor-acceptor-Donor Alternating Copolymers for Transistor Applications." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2807200615182600.
Повний текст джерела