Development of Polyphenylquinoxaline Graphite Composites.
BOEING AEROSPACE CO SEATTLE WA
Pagination or Media Count:
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-bisp-cyanophenoxyphenylglyoxalylbenzene and .8 mole p-bisphenylglyoxalylbenzene 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
- Laminates and Composite Materials
- Organic Chemistry
- Polymer Chemistry