Accession Number : ADA307400
Title : Addition-Type Polyimides from Solutions of Monomeric Reactants.
Descriptive Note : Technical note,
Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
Personal Author(s) : Delvigs, Peter ; Serafini, Tito T. ; Lightsey, George R.
PDF Url : ADA307400
Report Date : AUG 1972
Pagination or Media Count : 21
Abstract : The monomeric reactants approach was used to fabricate addition-type polyimide/graphite fiber composites with improved mechanical properties and thermal stability characteristics over those of composites derived from addition-type amide acid prepolymers. A screening study of 24 different monomer combinations was performed. The results of a more extensive investigation of a selected number of monomer combinations showed that the combination providing the best thermomechanical properties was 5-norbornene -2,3 -dicarboxylic acid monomethyl ester/4, 4'-methylenedianiline /3, 3'4, 4' -benzophenonetetracarboxylic acid dimethyl ester at a molar ratio of 2/3.09/2.09.
Descriptors : *MONOMERS, *REACTANTS(CHEMISTRY), *ADDITION REACTIONS, *POLYIMIDE RESINS, THERMOMECHANICS, FIBERS, MECHANICAL PROPERTIES, METHYL RADICALS, POLYMERS, COMPOSITE MATERIALS, THERMAL STABILITY, GRAPHITE, AMIDES, METHYLENES, ESTERS, ANILINES, CARBOXYLIC ACIDS, BENZOPHENONES.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE