Rigid-rod graft polymers and copolymers
 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. 
The United States of America as represented by the Secretary of the Air Force
C C
C08G C08G
inventional inventional
George J. My Robert C.
Moore Dotrong Evers