Thermooxidatively stable articulated p-benzobisoxazole and p-ben

Details Thermooxidatively stable articulated p-benzobisoxazole and p-ben Thermooxidatively stable articulated p-benzobisoxazole and p-ben

1981-10-02

1982-11-16

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528184, 528185, 528207, 528208, 528210, 528211, 528336, 528337, 528339, 528341, C08G 7322, C08G 7532

Patent

active

043595677

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 thermooxidative 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.

REFERENCES:
patent: 3313783 (1967-04-01), Iwakura et al.
patent: 4064109 (1977-12-01), Evers
patent: 4084048 (1978-04-01), Naarmann et al.
patent: 4115367 (1978-09-01), Evers
patent: 4142037 (1979-02-01), Evers et al.
patent: 4147858 (1979-04-01), Evers
patent: 4229566 (1980-10-01), Evers et al.

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