Accession Number : ADD009938

Title :   Thermooxidatively Stable Articulated P-Benzobisoxazole and P-Benzobisthiazole Polymers.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Evers,Robert C

Report Date : 16 Nov 1982

Pagination or Media Count : 9

Abstract : Articulated p-benzobisoxazole and p-benzobisthiazole polymers which contain a limited number of 3,3'-biphenyl or 2,2'-bipyridyl segments are synthesized, with inherent viscosities as high as 14 dl/g being recorded. The 3,3'-biphenyl or 2,2'-bipyridyl segments in the p-benzobisoxazole and p-benzobisthiazole polymers impart flexibility to the polymers without adversely affecting the thermooxidative stability. While the resultant articulated polymers exhibit liquid crystalline behavior in methanesulfonic acid and form strong cast films from that solvent, they also exhibit thermoxidative stability comparable to other p-benzobisthiazole and p-benzobisoxazole polymers. The resultant films are useful for the fabrication of high strength laminates to be used in severe environment structural applications. (Author)

Descriptors :   *Patents, *Heat resistant plastics, *Benzoxazoles, *Thiazoles, *Synthesis(Chemistry), Polymers, Viscosity, Pyridines, Oxidation resistance, Organic solvents, Sulfonic acids, Liquid crystals, Laminates, Structural properties, Flexible materials

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE