Accession Number : ADA305338

Title :   Development of Polyphenylquinoxaline Graphite Composites.

Descriptive Note : Final rept.,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA

Personal Author(s) : Shdo, Jose G.

PDF Url : ADA305338

Report Date : JUN 1976

Pagination or Media Count : 61

Abstract : Six polyphenylquinoxalines (PPQ) containing pendant cyano (CN) groups were synthesized. The polymers were characterized in terms of inherent viscosity, glass transition temperature, softening temperature and weight loss due to aging in air at 316 deg C (600 deg F). The potential for crosslinking PPQs by trimerization of pendant CN groups was investigated. A polymer derived from 1 mole 3,3',4,4'-tetraaminobenzophenone, .2 mole p-bis(p'-cyanophenoxyphenylglyoxalyl)benzene and .8 mole p-bis(phenylglyoxalyl)benzene was selected for more extensive characterization in HM-S graphite fiber-reinforced composites. Mechanical properties were determined using composites made from HM-S fiber and polymer and composites made from HM-S fiber, polymer and a potential CN group trimerization catalyst. Composite mechanical properties, interlaminar shear strength and flexure properties, were determined over the temperature range of +21 deg C to 316 deg C. jg

Descriptors :   *COMPOSITE MATERIALS, *GRAPHITE, *PHENYL RADICALS, *QUINOXALINES, MECHANICAL PROPERTIES, BENZENE, AGING(MATERIALS), POLYMERS, FIBER REINFORCED COMPOSITES, GLASS, TRANSITION TEMPERATURE, CATALYSTS, VISCOSITY, LAMINAR FLOW, WEIGHT REDUCTION, FLEXURAL PROPERTIES, SHEAR STRENGTH, SOFTENING.

Subject Categories : Laminates and Composite Materials
      Organic Chemistry
      Polymer Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE