United States of America As Represented by the Secretary of the Air Force

My Dotrong

Robert C Evers

Minhhoa Dotrong

George J Moore

Mark Sinsky

Ronald C Tomlinson

High compressive strength, three-dimensional para-oriented benzobisoxazole polymers of the formula: ##STR1## wherein Q is ##STR2## and wherein Z represents repeating units of the formula: ##STR3##

Adamantane based three-dimensional rigid-rod polymers

A two-dimensional, rigid-rod polymer of the formula: ##STR1## wherein x, y and z each has a value of 5 to 40; wherein the sum of x, y and z is about 20 to 100; and wherein PBX is a repeating group of the formula: ##STR2## is prepared by the polycondensation of trimeric acid (TMA) ##STR3## with 4-[5-amino-6-hydroxybenzoxazol-2-yl]benzoic acid (ABA) ##STR4## in polyphosphoric acid (PPA).

Two-dimensional benzobisoxazole rigid-rod polymers

There are provided fusible, rod-like graft copolymers having repeating units of the formula: ##STR1## wherein a ranges from about 0.75 to 0.97 and b is 1-a; wherein Z is a benzbisoxazole or benzbisthiazole moiety, wherein Ar is a linear phenylene or polyphenylene moiety, wherein Ar' is ##STR2## and wherein Y is a poly(etherketone) or a poly(etheretherketone), wherein the poly(etherketone) has repeating units of the formula ##STR3## wherein Q is a divalent phenylene or substituted phenylene moiety and c is an integer having a value of 1 to 4, and the poly(etheretherketone) has repeating units of the formula ##STR4## wherein Q' is a divalent phenylene or substituted phenylene moiety, d is an integer having a value of 1 to 4 and e is an integer having a value of 2 to 5. Also provided are methods for making these graft copolymers.

Graft copolymers of articulated rod-like polymers

Benzobisthiazole polymers with thiophene moieties having repeating units of the formula:

Benzobisthiazole polymers with thiophene moieties

Fusible, rod-like, graft polymers and copolymers having repeating units of the formula: ##STR1## wherein x ranges from 0 to about 0.97, y is 1-x, Y is a poly(etherketone) (PEK) or a poly(etheretherketone) (PEEK), and wherein Ba is a benzobisimidazole or benzobisthiazole moiety are provided. Also provided are methods for preparing the above polymers and copolymers, 2-(2,6-dimethylphenoxy)terephthalic acid and a method for preparing the latter.

Rigid-rod graft polymers and copolymers

There is provided a para-ordered, rigid-rod aromatic heterocyclic copolymer having repeating groups of the formula:

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My Dotrong