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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 211 (1993), S. 113-120 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe neuer Polyimide mit Phenylchinoxalin-Einheiten wurde durch Lösungspolykondensation von 2,2-Bis(1,3-dioxo-1H,3h-isobenzofuran-5-yl) hexafluoropropan (Hexafluorisopropyliden-diphthalsäure-anhydrid) mit Phynylchinoxalin-Einheiten enthaltenden aromatischen Diaminen synthetisiert. Aus diesen, in polaren Amiden löslichen Polymeren lassen sich transparente, flexible Filme mit niedriger Dielektrizitätskonstante und hoher thermischer Stabiltät (Zersetzungstemperaturen oberhalb 400°C) herstellen.
    Notes: A series of new polyimides with phenylquinoxaline units have been synthesized by solution polycondensation of 2,2-bis(1,3-dioxo-1H,3H-isobenzofuran-5-yl)hexafluoropropane (hexafloroisopropylidene-diphthalic anhydride) with aromatic diamines containing preformed phenylquinoxaline units. These polymers are soluble in polar amidic solvents and can be processed into transparent, flexible films, having low dielectric constants and high thermal stability with decomposition temperatures above 400°C.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 227 (1995), S. 19-26 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(phenylchinoxalin-imid-amid)e wurden durch Polykondensation von aromatischen Diaminen mit Dicarbonsäuredichloriden hergestellt, wobei die Diamine Phenylchinoxalin-Einheiten und die Dichloride Imidringe und Perfluorpropylideneinheiten enthielten. Diese Polymeren besitzen eine hohe thermische Stabilität; ihre Glasübergangstemperaturen liegen im Bereich 225-290°C, und sie zersetzen sich oberhalb 400°C. Ein Vergleich mit ähnlichen heterocyclischen Polymeren läßt den Schluß zu, daß der Abbau mit der Zersetzung von Amidgruppen beginnt. Aus Lösung gegossene Filme der Polymeren weisen gute elektrische Isolationseigenschaften auf, ähnlich denen eines Standardfilms (Film H). Ihre hervorragendste Eigenschaft ist jedoch ihre bemerkenswerte Löslichkeit in polaren aprotischen Lösungsmitteln, was für ihre praktische Anwendung von Bedeutung ist.
    Notes: Poly(phenylquinoxaline-imide-amide)s have been synthesized by solution polycondensation of aromatic diamines containing preformed phenylquinoxaline units with diacid dichlorides incorporating preformed imide rings and perfluoroisopropylidene units. These polymers show high thermal stability; they decompose above 400°C and have glass transition temperatures in the 225-290°C range. Comparison of these compounds with related heterocyclic polymers leads to the conclusion that the decomposition of the former ones begins with the destruction of amide groups. Films prepared from polymer solutions showed good electrical insulating properties, comparable to those of a standard film (Film H). The highest quality of these poly(phenylquinoxaline-imide-amide)s is their remarkable solubility in polar aprotic solvents, which is very important for practical applications.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2014-01-01
    Print ISSN: 0014-3057
    Electronic ISSN: 1873-1945
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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