New technique improves melt flow of polyimide. Uses chemical imidization or cyclodehydration techniques that do not cause significant decrease in molecular weight. Process involves dissolution of polyamide acid in amide solvent or mixture of ether and amide solvent at low percentage of solids followed by treatment of this solution with aprotic organic base, such as triethylamine or pyridine, for period of time prior to treatment with organic dehydrating agent. Latter treatments facilitates formation of polyimide. Useful for production of polyimide molding materials. Expected to have widespread application in preparation of easily processed adhesives, molding powders, and matrix resins.


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    Titel :

    Developing Crystallinity In Linear Aromatic Polyimides


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1988-10-01



    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



    Soluble Aromatic Polyimides For Film Coating

    St. Clair, Anne K. / St. Clair, Terry L. | NTRS | 1989



    Aromatic Polyimides With Low Dielectric Constants

    St. Clair, Anne K. / St. Clair, Terry L. / Pratt, J. Richard | NTRS | 1994