Cp. Gao et al., THERMALLY CROSS-LINKABLE POLYIMIDES CONTAINING THE 1,2-DIPHENYLCYCLOPROPANE OR DIPHENYLACETYLENE MOIETY, Journal of polymer science. Part A, Polymer chemistry, 34(3), 1996, pp. 413-420
Poly(ether imide)s containing the 1,2-diphenylcyclopropane or diphenyl
acetylene moiety have been synthesized from two new dianhydrides by so
lution condensation. Characterization of and crosslinking studies on t
hese polymers were carried out utilizing DSC, TGA, and NMR. The polyme
rs can be thermally crosslinked when heated above 350 degrees C and th
e glass transition temperatures (T-g) of the polymers increase after c
rosslinking. The resulting crosslinked networks are insoluble in all s
olvents tried. Thermogravimetric analysis shows that no significant we
ight loss accompanies the cross-linking reaction. (C) 1996 John Wiley
& Sons, Inc.