Relevant bibliographies by topics / Polyimide siloxanes

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  1. Dissertations / Theses

Academic literature on the topic 'Polyimide siloxanes'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Dissertations / Theses on the topic "Polyimide siloxanes"

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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