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Dissertations / Theses on the topic 'Polymers Polymers Polyimides'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Shokouhi, 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.

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2

Ngo, Thomas T. "Chemistry and characterization of cycloaddition polyimides." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/27107.

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3

He, Zhanqi. "A cycloaddition approach to the curing of polyimides." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/27301.

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4

Dorsey, Kyra. "Formation, morphology, and properties of oriented LaRC-IA filaments." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/10948.

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5

Criss, Jim McRae. "Synthesis, characterization, and study of polyimide processing additives and their effect on polyimide properties." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20015.

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6

Kulkarni, Pallavi P. "Effect of polyhedral oligomeric silsesquioxane on gas transport properties of polyimide /." Connect to full text in OhioLINK ETD Center, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1196883179.

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Dissertation (Ph.D.)--University of Toledo, 2007.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in the Engineering Science Concentration in Chemical and Environmental Engineering." Bibliography: leaves 213-221.

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7

Summers, John D. "Siloxane modified engineering polymers: synthesis and characteristics." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/77847.

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Novel, polyand weight, randomly coupled, poly(imide siloxane) segmented copolymers were prepared and characterized. The copolymers were synthesized in two steps, the first involving the generation of soluble poly(amic acid) intermediates through reaction of various aromatic dianhydrides and aromatic diamines with a series of bis(aminopropyl)polydimethylsiloxane oligomers. These difunctional siloxane oligomers were prepared through the anionic equilibration of octamethylcyclotetrasiloxane with bis(3-aminopropyl)tetramethyldisiloxane in the presence of a siloxanolate catalyst. The aromatic monom

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8

Romeo, Michael Joseph. "Design, synthesis, and characterization of novel, low dielectric, photodefinable polymers." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24782.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Henderson, Cliff; Committee Member: Beckham, Haskell; Committee Member: Hess, Dennis; Committee Member: Koros, William; Committee Member: Tolbert, Laren.

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9

Karangu, Njeri T. "Synthesis, characterization and properties of diacetylene functionalized polyimides." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/27368.

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10

Meyer, Gerald W. "Novel high performance thermosetting polyimides." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05222007-091420/.

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11

Dawood, Bann. "Mixed matrix membranes consisting of porous polyimide networks and polymers of intrinsic microporosity for gas separation." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/mixed-matrix-membranes-consisting-of-porous-polyimide-networks-and-polymers-of-intrinsic-microporosity-for-gas-separation(bb07d633-69dc-471b-a5ae-f1f0888615b6).html.

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This research aimed to develop the fabrication of mixed matrix membranes (MMMs) utilizing a polymer of intrinsic microporosity (PIM-1) with porous polyimide networks, and to explore their effect on gas transport properties. PIM-1 has been chosen as polymer matrix for its high surface area and high sorption of gases. It is also considered as interesting candidate for membrane gas separation. PIM-1 has been synthesized successfully using high temperature methods (40 min, 160 oC) and low temperature methods (72 h, 65 oC). Porous polyimide networks have been chosen as organic fillers as they have

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12

Ali, Majid. "Structure/property relationships in a series of novel polyimides and polyamides." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343604.

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13

Rancourt, James David. "Electrical properties of polyimides modified with metal salts." Diss., Virginia Tech, 1987. http://hdl.handle.net/10919/39288.

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14

Criss, Jim McRae. "Investigation of melt plasticization and solid embrittlement mechanisms in polyimides by addition of imide molecules." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/20056.

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15

Bott, Richard H. "Characterization of modified polyimide adhesives." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53914.

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An addition polyisoimide prepolymer was modified through the incorporation of metal particles. The response of this metal/polymer composite to mechanical vibrations and the passage of electric current was measured. Model aluminum conductor bar joints containing this material were assembled and exposed to elevated temperatures for extended periods of time while the electrical properties of the composites were monitored. In the most favorable systems, no thermal degradation of the electrical properties was observed. Dynamic mechanical behavior of the metal/polymer composites indicated good adhes

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16

Chan, Suk-hang. "Synthesis of diazacrown ether and transition metal containing polymers by atom transfer radical polymerization and other methods /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25212102.

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17

Raeiszadeh, Mehrsa. "Patterning and cross-linking of functionalized polynorbornene polymers." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43722.

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A challenging application space exists for high-aspect-ratio, high-fidelity dielectrics in micro-electro-mechanical system (MEMS), microelectronic, and photonic applications. Photosensitive polymers are widely used in these fields because they are relatively easy to process and pattern, and have good mechanical properties. Photosensitive polynorbornene (PNB)-based dielectrics have been shown to have high sensitivity, excellent photodefinition properties, and high mechanical strength making them suitable for MEMS, microelectronic packaging, and photonic applications. PNB-based dielectrics can

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18

Rajarathinam, Venmathy. "Imprint lithography and characterization of photosensitive polymers for advanced microelectronics packaging." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34722.

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To enable fast and reliable processors, advances must be made in the interconnections on the printed circuit board and in the interconnections from the chip to the printed circuit board. Processing techniques have been demonstrated to fabricate a copper-clad encapsulated air dielectric layer to enable low loss off-chip electrical signal lines using sacrificial polymers and the three dimensional patterning capabilities of imprint lithography. The inclusion of an air gap can eliminate the dielectric loss allowing the signal to propagate over longer lengths. Additionally, the low dielectric co

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19

Witsch, James Michael. "Poly(amide acid) infusion with Copper(II) Chloride to form polyimide microcomposite films." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/34822.

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20

Joseph, Ronald Matthew. "Synthesis and Characterization of High Performance Polymers for Gas Separation and Water Purification Membranes and as Interfacial Agents for Thermplastic Carbon Fiber Composites." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/96219.

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This dissertation focuses on the synthesis and characterization of high performance polymers, specifically polybenzimidazoles (PBIs) for gas separation applications and polyimides (PI) for water purification and as interfacial agents for thermoplastic carbon fiber composites. Two methods for improving the gas transport properties (for H2/CO2 separation) of a tetraaminodiphenylsulfone (TADPS)-based polybenzimidazole were investigated. Low molecular weight poly(propylene carbonate) (PPC) and poly(ethylene oxide) (PEO) were incorporated as sacrificial additives that could be removed via a cont

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21

Minervino, Matteo. "Effets de la thermo-oxydation sur le comportement mécanique de matériaux composites pour applications aéronautiques." Phd thesis, ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00926658.

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L'oxydation conduit à une modification des propriétés mécaniques de la matricepolymère, associée à sa fragilisation, et à la création de déformations résiduelles (retrait) quiinduisent l'amorçage et le développement d'endommagements.Avec l'objectif de prévoir l'amorçage de ces endommagements, il est nécessaire de calculerl'état des contraintes à différentes échelles du matériau vieilli. Il faut donc disposer demodèles de comportement du polymère et du composite dépendant du niveau d'oxydation.Deux types de difficultés se présentent : l'une associée à la nature locale de ce phénomène,difficilem

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22

Al-Khudary, Nadine. "Material thermal conductivity measurement by the 3-omega method : application to polymers characterization using inkjet printing technology." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10135/document.

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Dans le domaine de l'électronique souple, les substrats flexibles à base de polymères sont de plus en plus utilisés. Si dans les prochaines années, les structures de propagation mises en œuvre sur ce type de substrat véhiculent une puissance, alors la connaissance de la conductivité thermique de ces matériaux est essentielle. Dans ce travail, nous mesurons la conductivité thermique de matériaux de type polymère en utilisant la méthode 3 omégas. Des mesures ont été effectuées sur du polydiméthylsiloxane (PDMS). Un procédé technologique particulier est utilisé pour la fabrication des échantillon

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23

Vivod, Stephanie L. "INFLUENCE OF TRIFLUOROMETHYL SUBSTITUENTS ON STRUCTURAL AND THERMAL STABILITY OF POLYIMIDE AEROGEL MATRIX." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron155855118490992.

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24

Jayaraman, Saikumar. "Synthesis and characterization of high Tg nanofoams based on pyromellitic dianhydride and 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane polyimide block and graft copolymers." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05222007-091419/.

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25

Gopalanarayanan, Bhaskar. "Analysis of Thermoplastic Polyimide + Polymer Liquid Crystal Blends." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc279285/.

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Thermoplastic polyimides (TPIs) exhibit high glass transition temperatures (Tgs), which make them useful in high performance applications. Amorphous and semicrystalline TPIs show sub-Tg relaxations, which can aid in improving strength characteristics through energy absorption. The a relaxation of both types of TPIs indicates a cooperative nature. The semicrystalline TPI shows thermo-irreversible cold crystallization phenomenon. The polymer liquid crystal (PLC) used in the blends is thermotropic and with longitudinal molecular structure. The small heat capacity change (ACP) associated with the

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26

Teo, Nicholas J. "Nano, Micro and Macro Scale Control of Porous Aerogel Morphology." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron154989595598542.

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27

Sébileau, Jean-Charles. "Elaboration d'assemblages multicouches polymère/métal par frittage "Spark Plasma Sintering" pour des applications d'allègement de structure." Thesis, Mulhouse, 2018. http://www.theses.fr/2018MULH1038/document.

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Les assemblages multicouches polymère-métal, combinant la faible densité du polymère à la résistance du métal, se présentent comme une solution à fort potentiel pour répondre aux problématiques d’allégement de structure dans le secteur des transports. Plus particulièrement, ces travaux s’intéressent à l’élaboration de multicouches basés sur l’utilisation de polymères thermoplastiques thermostables associés à un alliage d’aluminium via un procédé de la métallurgie des poudres appelé « Spark Plasma Sintering » (SPS). Dans un premier temps, la mise en forme par SPS du polymère seul a été étudiée.

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28

Cao, Yuanmei. "Antireflective Polyimide Based Films." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1335501090.

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29

Cano, 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.

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Dissertation (Ph.D.)--University of Akron, Dept. of Polymer Engineering, 2005.<br>"August, 2005." Title from electronic dissertation title page (viewed 09/24/2005) Includes bibliographical references.

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30

Shinko, Andrew. "Structure and Morphology Control in Polymer Aerogels with Low Crosslink Density." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1430399529.

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31

Gu, Senlong. "BUILDING BLOCKS AND THEIR EFFECTS ON POLYMER AEROGEL PROPERTIES." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1468493203.

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32

Farrell, Erin. "DEVELOPMENT OF EMULSION-TEMPLATED POLYIMIDE AEROGEL MONOLITHS AND SHEETS." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1626970735475996.

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33

Lin, Linda. "Molecular orientation studies of spin-coated polyimide films." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/11032.

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34

Ellison, Matthew M. "Metal/polymer interactions in polyimide adhesives." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-08282003-155323/.

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35

Wood, Karen H. "The thermal cure of phenylethynyl-terminated polyimides and selected model compounds." W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539623896.

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The ability to process high performance polymers into useful adhesives and high quality composites has been significantly advanced by synthetic techniques in which oligomers terminated with reactive groups cure or crosslink at elevated temperature after the article has been fabricated. Several matrix resin systems of considerable interest to the aerospace community utilize phenylethynyl terminated imide (PETI) technology developed at the Langley Research Center to achieve this advantage. This work addresses the cure chemistry of PETI oligomers.;The thermal cure of selected oligomers and model

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36

Soisson, Arnaud. "Développement de polymères hydrophobes résistants à haute température pour l’encapsulation de module de puissance." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV024.

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L’objectif de cette thèse était de concevoir denouveaux matériaux polymères hydrophobes pour la protectionde composants semi-conducteurs, résistants à hautetempérature, aux forts champs électriques et aux atmosphèresagressives. Dans ce contexte, les polyimides d’addition sontapparus comme la famille de polymères la mieux adaptée pourl’application envisagée. La synthèse de l’encapsulant étantréalisée directement dans les boîtiers des modules, elle ne peutdonc pas contenir de solvant organique exogène. Ainsi, nousavons développé de nouvelles voies de synthèse sans solvantde poly(aminobismaléimid

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37

Almazrou, Yaser M. "EFFECTS OF MOBILE NANOPARTICLES ON THE MORPHOLOGY AND TOPOGRAPHY OF POLYSULFONE/POLYIMIDE THIN FILMS." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1531145752009354.

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38

Wickman, Kristy. "The Synthesis of Polyimides Containing Oxyalkylene Units." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1405623715.

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39

Delozier, Donavon Mark. "Preparation and characterization of polyimide/organoclay nanocomposites." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539623403.

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The purpose of this research was to prepare nanocomposite materials comprised of exfoliated clay particles in a polyimide matrix. Poly(amide acid)/organoclay solutions and polyimide/organoclay films were prepared and the clay dispersion was characterized by visual inspection, XRD, and TEM. Mechanical measurements and certain thermal characterization measurements were also obtained. The research began by attempting to repeat the procedures set forth in the literature. Most of the polyimide/organoclay nanocomposites were being prepared by mixing prepared poly(amide acid) solutions with organocla

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40

Robillard, Kerri Ann. "The Imidization Reactions of PMR-15 Polyimide." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539625735.

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41

Yan, Han. "Electrospinning-Derived Carbon/Graphite Nanofiber Mats from a Polyimide-Mesophase Pitch Blend Precursor for Flexible Thermal Management Thin Films." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1309678439.

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42

Sturgill, G. Kip. "Stabilization of polyimide blends through solid-state crosslinking." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/10080.

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43

Zhai, Chunhao. "Polyimide Aerogels and Their Applications in Removal of Airborne Nanoparticles." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1464284202.

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44

Ammar, Ali M. "The Morphology and Mechanical Properties of Polysulfone/Polyimide Nanocomposite Films." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342388267.

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45

Li, Yuntao. "Synthesis and cure characterization of high temperature polymers for aerospace applications." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3075.

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The E-beam curable BMI resin systems and phenylethynyl terminated AFR-PEPA-4 oligomer together with an imide model compound N-phenyl-[4-(phenylethynyl) phthalimide] were synthesized and characterized. E-beam exposure cannot propagate the polymerization of BMI system until the temperature goes up to 100oC. However, a small amount of oligomers may be generated from solid-state cure reaction under low E-beam intensity radiation. Higher intensity E-beam at 40 kGy per pass can give above 75% reaction conversion of BMI with thermal cure mechanism involved. NVP is a good reactive diluent for BMI re

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46

Ghassemi, Hossein. "Synthesis and properties of novel polyimides utilizing hydrazine." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28451.

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Hydrazine reacts with phthalic anhydride to give a mixture of cyclic hydrazide and N-aminophthalimide. However, the N-aminoimide is exclusively formed in high yield by the reaction of 1,8-naphthalic anhydride with hydrazine. N-aminoimides act as amines and react further with cyclic anhydrides to yield stable bisimides containing an N-N linkage. The syntheses of several bis(N-aminoimide)s from the corresponding bisanhydrides which contain the naphthalic anhydride moiety have been described. Novel high molecular weight polyimides have been synthesized by the reaction of these bis(N-aminoimide)s

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47

Comer, Anthony C. "DYNAMIC RELAXATION PROPERTIES OF AROMATIC POLYIMIDES AND POLYMER NANOCOMPOSITES." UKnowledge, 2011. http://uknowledge.uky.edu/cme_etds/1.

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The dynamic relaxation characteristics of Matrimid® (BTDA-DAPI) polyimide and several functionalized aromatic polyimides have been investigated using dynamic mechanical and dielectric methods. The functionalized polyimides were thermally rearranged to generate polybenzoxazole membranes with controlled free volume characteristics. All polyimides have application in membrane separations and exhibit three motional processes with increasing temperature: two sub-glass relaxations (ƴ and β transitions), and the glass-rubber (α) transition. For Matrimid, the low-temperature ƴ transition is purely non

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48

Shamsipour, Hosna. "Preparation, characterization and properties of polymers incorporating spiro-centers." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/preparation-characterization-and-properties-of-polymers-incorporating-spirocenters(955d17cf-7797-48d2-90c7-6c6894038541).html.

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This research aimed to develop new polymeric materials for use in membrane or adsorption processes for carbon dioxide capture. In particular, it explored the synthesis, characterization and properties of polymers incorporating a spiro-center. A dianhydride containing a spiro-center (An-1), suitable for use in the preparation of polyimides, was synthesized using a previously reported procedure. The spiro-center makes the structure of the resulting polymers (PIM-PIs) similar to polymers of intrinsic microporosity (PIMs), which are known for their high internal surface area and outstanding membra

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49

Ward, Jason Keith. "Crosslinkable mixed matrix membranes for the purification of natural gas." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39465.

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Mixed matrix nanocomposite membranes composed of a crosslinkable polyimide matrix and high-silica molecular sieve particles were developed for purifying natural gas. It was shown that ideal mixed matrix effects were not possible without sieve surface modification. A previously developed Grignard procedure was utilized to deposit magnesium hydroxide nanostructures on the sieve surface in order to enhance polymer adhesion. Analyses of Grignard-treated sieves pointed to the formation of non-selective voids within the surface deposited layer. These voids were suspected to lead to lower-than-ex

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50

Miller, Sandi G. "Effects of Nanoparticle and Matrix Interface on Nanocomposite Properties." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1216947385.

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