Second-generation PMR-type polyimides (PMR-II polyimides) of enhanced thermo-oxidative stability prepared by substitution of para-aminostyrene (PAS) end caps for nadic-ester (NE) end caps used in prior PMR-II polyimides. Laminates unidirectionally reinforced with graphite fibers and made with PAS-capped resins exhibited thermo-oxidative stabilities significantly greater than those of similar laminates made with NE-capped PMR-II resins. One new laminate exhibited high retention of weight and strength after 1,000 h of exposure to air at 371 degrees C.


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    Titel :

    Improved PMR Polyimides For Heat-Stable Laminates


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    01.04.1994



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Soluble, thermally-stable aromatic polyimides

    St. Clair, T. L. / St. Clair, A. K. / Smith, E. N. | NTRS | 1977



    Thermally Stable Polyimides from Solutions of Monomeric Reactants

    T. T. Serafini / P. Delvigs / G. R. Lightsey | NTIS | 1972


    Thermally stable polyimides from solutions of monomeric reactants

    Serafini, Tito T. / Delvigs, Peter / Lightsey, George R. | TIBKAT | 1971


    Thermally Stable Polyimides from Solutions of Monomeric Reactants

    P. Delvigs / G. R. Lightsey / T. T. Serafini | NTIS | 1971