Structural Studies of Monomeric Model Compounds and Related Ordered Polymer Systems: The Crystal and Molecular Structures of 2,6-Diphenylbenzo (1,2-d:5,4-d')-Bisoxazole and 2,6-Diphenylbenzo (1,2-d:4,5-d') Bisthiazole.

摘要

The Materials Laboratory at Wright-Patterson Air Force Base is presently investigating the applicability of ordered polymer systems as self-reinforced polymer composites. The preparation of high strength materials consisting of rod-like polymers, such as Kevlar, requires a high degree of orientation of the rods. Of the numerous rod-like polymer systems that have been studied to date, the paraconfigured aromatic heterocyclic class of polymers, such as the polybenzoxazoles (PBO) and the polybenzthiazoles (PBT), are especially promising since precipitated films and fibers of these materials exhibit high tensile strengths and good thermal oxidative stabilities. These systems are also excellent alternatives to the more widely known aromatic polyamides, such as Kevlar and Nomex.