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Showing 1 to 7 of 7 for “"Polyphenylenes"”.
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Synthesis of Highly Fluorinated Diels-Alder Polyphenylenes
… analogues. Meanwhile, Diels-Alder polyphenylenes (DAPPs) are known for thermal stability as well as their rigid structure and glassy physical characteristics, which have led to a variety of film and membrane applications. This dissertation merges these two fields by demonstrating a …
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Studies Toward Highly Fluorinated Polyphenylenes by Diels-Alder Polymerization
Diels-Alder polyphenylenes (DAPPs) are chemically and thermally stable polymers, used for dielectric resins, gas separation membranes, and fuel cell proton exchange membranes. Highly fluorinated DAPPs are expected to have better thermal stability and chemical resistance, higher glass transition …
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Dielectric and Kerr Effect Studies of Electro-Active Polymer Complexes
Samples of polyphenylenes have been prepared from benzene, biphenyl and 1,4-dibromobenzene using a variety of synthetic procedures. The nature and composition of the polymers has been studied indirectly by solvent extraction of low-molecular weight material. Chromatographic techniques have shown …
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Perfluoroarylated Cyclopentadienones: Synthesis, Characterization and Polymerization
… the synthesis of highly fluorinated Diels-Alder polyphenylenes. The first section of this chapter describes the three-pot synthesis of a perfluoroarylated bis(cyclopentadienone) monomer. The synthesis begins with the previously reported substitution reaction of decafluorobiphenyl and sodium …
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Cyclopentadiene as a Platform for Polymer Synthesis and Modification of Macromolecular Systems
… 1,3-diethynylbenzene afforded linear Diels-Alder polyphenylenes (DAPPs) having lateral tert-butyl and perfluoro-4-tolyl substituents. The perfluoro-4-tolyl-substituted DAPPs are thermally stable, glassy solids (Tg ~ 230 deg C) that could not be cast into stable films (Mn ~ 10kDa, DPn ~ 10). New …
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Hochverzweigte Polyphenylene als Matrixmaterial für nanoporöse Isolatorsysteme mit niedriger Dielektrizitätskonstante
Neue nanoporöse Materialien mit niedrigen Dielektrizitätskonstanten werden in der Mikroelektronik dringend benötigt. Eine Methode, die Dielektrizitätskonstante eines gegebenen Materials weiter zu reduzieren, ist die Einführung von geschlossenen und luftgefüllten Poren im Nanometerbereich. Die …