Crosslinked polymers were obtained by crosslinking 4,4'-oxydianiline-4,4'-oxydiphthalic dianhydride polyamic acid (I) with TDI-terminated polyethylene glycol or TDI-terminated poly(ethylene adipate). Crosslinking occurred by reaction of the isocyanate groups with carboxylic and amide groups of I. Theor. amts. of crosslinkers in the polymers was .ltorsim.80%. The crosslinked products were characterized by IR spectroscopy, dynamic mech. anal., and SEM. The results depended on the the and amt. of the crosslinker.