Y. Gao et al., Preparation and characterization of soluble copoly(aryl ether ketone)s containing hindering structures, J APPL POLY, 78(1), 2000, pp. 20-24
New copoly(aryl ether ketone)s have been synthesized by polycondensation of
2,2',3,3',6,6'-hexaphenyl-4,4'-diphenol, 2,2'-p-hydroxyphenyl-iso-propane,
and 4,4'-difluorobenzophenone. The technology of C-13-NMR was used to dete
rmine contents of the two bisphenols in the copolymers. Chain structure was
characterized by illustrating average block length (L-A, L-C) in terms of
portion of the triads (AKA, CKC, AKC). The obtained copoly(aryl ether keton
e)s have the properties of excellent solubility, high heat-resistance, good
tensile strength, and good selectivity for gas permeability. (C) 2000 John
Wiley & Sons, Inc.