Chauhan, P. M. S.; Niyer, R.; Bhakuni, D. S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 38 - 42
申请人:The United States of America as represented by the Secretary of the Air
公开号:US05514769A1
公开(公告)日:1996-05-07
A crosslinkable polymer having repeating units of the formula: ##STR1## wherein Ar is selected from the group consisting of ##STR2## These polymers are useful in the preparation of molecular composites with rigid-rod polymers, including para-oriented benzobisazole polymers, such as benzobisthiazole, benzobisoxazole and benzobisimidazole polymers.
Wholly aromatic thermotropic copolyesters with controlled flexibility
申请人:United States of America as represented by the Secretary of the Air Force
公开号:US06355765B1
公开(公告)日:2002-03-12
A wholly aromatic copolyester having repeating units of the formula:
wherein Ar1 is
wherein Q is selected from the group consisting of —H, —CH3, —CF3, —Cl, —Br, and —C6H5;
wherein Ar2 is selected from the group consisting of
wherein X is selected from the group consisting of —Br, —Cl, —CH3 and —C6H5;
wherein Ar3 is
wherein Ar4 is selected from the group consisting of
wherein m has a value of 0.05 to 0.95 and n has a value of 100-m, is characterized by accessible nematic-isotropic transition temperatures providing outstanding orientational order and mechanical properties.