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Dissertations / Theses on the topic 'Polyimide siloxanes'

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Published: 4 June 2021
Last updated: 10 February 2022

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1

Moyer, Eric Scott. "Photocrosslinkable polyimide and poly(imide siloxane) homo- and copolymers: synthesis and characterization." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54251.

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Novel, high molecular weight, high glass transition temperature, photocrosslinkable polyimide and poly(imide siloxane) homo- and segmented copolymers were prepared and characterized. The polyimides were synthesized by the classical two step method of first preparing soluble poly(amic acid) prepolymers by the reaction of various aromatic dianhydrides with aromatic diamines. The siloxane modified copolymers were synthesized by reacting single or mixed components of the aromatic dianhydrides with a mixture of aromatic amine and bis(3-aminopropyl) end blocked polydimethyl siloxane oligomers in a c
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2

Kaltenecker-Commercon, Joyce Marie. "Water ingression into poly(imide-siloxane)s /." This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-165710/.

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3

Kaltenecker-Commerçon, Joyce Marie 1965. "Water ingression into poly(imide-siloxane)s." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38345.

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The interaction of water vapor with the surface and bulk of poly(imidesiloxane) copolymers has been characterized in an attempt to determine the important factors in the copolymer's resistance to water ingression. The multi-block copolymers were synthesized from benzophenone tetracarboxylic dianhydride, bisaniline P and pre-formed amine-terminated poly(dimethylsiloxane) oligomers, with phthalic anhydride as an end-capping agent. Similar copolymers had been previously shown to have reduced water sorption, increased surface hydrophobicity, and increased adhesive durability in hot/wet environmen
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4

Schrotter, Jean-Christophe. "Elaboration et caractérisation de matériaux mixtes polyimide-silice : application à la séparation de gaz et corrélations structure-propriétés." Montpellier 2, 1996. http://www.theses.fr/1996MON20130.

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L'elaboration de materiaux mixtes organiques/inorganiques s'inscrit dans le cadre de la demande croissante de materiaux de plus en plus specifiques. En effet, les proprietes des composantes organiques et inorganiques peuvent etre combinees pour adapter le materiau final a des contraintes d'utilisation particulieres dans le domaine de l'electronique, l'optique, la mecanique et la filtration sur membranes. Des membranes mixtes polyimide-silice ont ete synthetisees par des reactions d'hydrolyse, de condensation et de polyimidisation pour des applications de separation de gaz a haute temperature (
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5

Tschen, Molina Francisco. "Synthesis of novel polyimides for the testing of structure-processing and property relations when used to form high temperature polymer matrices." Texas A&M University, 2005. http://hdl.handle.net/1969.1/5006.

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High-performance polymers have found an extreme range of applications in the aerospace industry. Composites which have polymers incorporated in them can usually meet the needs of the design, and are the ideal materials for aerospace applications due to their light weight, high strength, and radar transparency. Phenyl-ethynyl terminated oligomers, for example, have found many uses in the aerospace industry. Phenyl-ethynyl terminated oligomers (AFR-PEPA-N) exhibit glass-transition temperatures of up to 450°C. Unfortunately crystals form due to interactions of the oligomers. These crystals do
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6

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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7

Pechar, Todd W. "Fabrication and Characterization of Polyimide-based Mixed Matrix Membranes for Gas Separations." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/28355.

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A series of mixed matrix membranes based on zeolites incorporated into fluorinated polyimides were fabricated and characterized in this study. The first system consisted of a polyimide (6FDA-6FpDA-DABA) with carboxylic acid groups incorporated into its backbone and amine-functionalized zeolite particles (ZSM-2). FTIR indicated that these functional groups interacted with each other through hydrogen bonding. Both SEM and TEM images revealed good contact between the polyimide and the zeolite. Permeability studies showed a drop in He permeability suggesting there were no voids between the two
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8

Lin, Tingdong. "Surface and interphase studies of the adhesion of a siloxane- modified-polyimide coating on metals." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42154.

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<p>This research focused on the surface modification and interfacial profile studies of a siloxane modified polyimide, BDS [BTDA (3,3\4.4'~ benzophenonetetracarboxylic dianhydride) ~ DDS (3.3'~diaminodiphenyl sulfone) - PSX (polydimethylsiloxane) copolymer], used as a coating material. The BDS coating surface can be modified by pretreatment in an alkaline solution. This surface pretreatment etched away the top siloxane surface layer, activated the surface by exposing and creating polar functional groups, particularly carboxylic acid groups, and roughened the surface. These changes on the coati
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9

Nelamangala, Sathyanarayana Sakshi. "Effect of Graphene on Polyimide/Poly(Dimethyl Siloxane) Copolymer for Applications in Electrochemical Energy Storage." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin157441779879328.

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10

Bowens, Andrea Demetrius. "Synthesis and Characterization of Poly(siloxane imide) Block Copolymers and End-Functional Polyimides for Interphase Applications." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/29985.

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End-functional poly(ether amic acid)s and poly(siloxane imide) multiblock copolymers, comprised of 2,2'-Bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) / meta-phenylene diamine (MPDA) and hexafluoroisopropylidene-2-bis(phthalic acid anhydride) (6FDA) / meta-phenylene diamine (MPDA) polyimide segments, have been prepared and characterized to explore possibilities for controlling interface properties. Incorporation of polydimethylsiloxane (PDMS) components into polyimide backbone structures can yield advantageous properties such as low energy surfaces and low stress interfaces.
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11

Stovall, Benjamin Joseph. "Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103613.

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Polyimides epitomize one of the most versatile high-performance engineering polymers. Polyimides are inherently mechanically robust, chemically inert, and thermooxidatively stable to 400+ °C depending on their chemical structure, enabling their function in numerous aerospace, electronic, medical, and flame-retardant applications. Polyimides can be highly modular even within synthetic limitations, which promotes and sustains innovative research. One recent interest concerns the innovation of fire suppression foams. Aqueous film-forming foams (AFFFs) are regularly sought when engaging liquid fu
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12

Zhao, Jun-Kai, and 趙俊凱. "The Synthesis and characteriezation of Crosslinkable Polydimethyl- siloxane-Polyimid Copolymer." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/43491489160569501668.

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碩士<br>國立雲林科技大學<br>工業化學與災害防治研究所<br>92<br>There are two parts in this study; First part, we use octamethylcyclotetrasiloxane(D4) and tetramethyltetravinyl- cyclotetrasiloxane(V4) and 1,3-bis[3-amino- propyl]-1,1,3,3, tetramethyl-disiloxane(DSX) and use Pt catalyst making a series polysiloxane of vinyl functional group. The series polysiloxane of vinyl group was determined by FTIR and NMR to decide the functional group and molecule structure and molecular weight. Second part, we use 4, 4’-oxydianile(ODA) and pyromellitic dianhydride(PMDA) and the series polysiloxane of vinyl group to synthesize p
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13

Su, Jen Hung, and 蘇仁鴻. "Study on Polyhedral Oligomeric Silsesquioxane (POSS)/ Siloxane-Contaning Polyimide and Epoxy Nanocomposites." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/91824442774688293336.

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碩士<br>國立交通大學<br>應用化學系所<br>92<br>Three starting materials were synthesized : siloxane-contaning imide with difunctional double bonds (N1), polyhedral oligomeric silsesquioxane (POSS) with monofunctional double bond (POSS-D), and POSS with nadic anhydride (POSS-A). One crosslinked material obtained by the reaction of N1 with POSS-D was compared with another material, which was prepared by the reaction of commercial epoxy ERL-4221 with POSS-A. FTIR was employed to monitor the curing reactions. Thermal characters of materials were performed with DSC, TGA, and TMA. Gel fractions were measured by co
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14

施雅婷. "Effect of Surface Characteristics of Polyimide /Titania Nano Hybrid Films with siloxane diamine." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/11799173734397489750.

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15

Liou, You-Tsz, and 劉祐慈. "Studies on fluorine-containing sulfonated polyimide -siloxane crosslinking structure as a fuel cell protonexchange membrane." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/17971074938666864011.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系碩士班<br>101<br>In this study , we have prepared fluorine-containing sulfonated polyimide – siloxane(FSPIS) from 2,2&apos;&apos;-Bis(trifluoromethyl)benzidine(TFMB), 2,2’-benzidinedisulfonic acid(BDSA), dimethylsiloxane(PDMS)and 1,4,5,8-naphthalenetetracarboxylic dianhydride（NDTA）by a thermal imidization. The crosslinked structure(C-FSPIS）was prepared from the siloxane segments which was attacked on its methyl group using the diperoxide(BPO) initiator. First , we synthesized the FSPIS，and then add different proportions of initiator BPO to the prepare proton exchange m
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