writer：Jiangtao Liu, Guofei Chen,* Junchao Guo, Nafeesa Mushtaq, Xingzhong Fang.*
keywords：Phenolphthalein, Cardo poly(ether ketone imide)s, Aromatic nucleophilic substitution, polymerization
source：期刊
specific source：Polymer
Issue time：2015年
A series of cardo poly(ether ketone imide)s (PEKI-C) containing large-volume bulky phthalide groups were prepared by aromatic nucleophilic substitution reaction of commercially available phenolphthalein and 4,40-bis(4-fluorophthalimido)diphenyl ether/4,40-difluorobenzophenone. The glass transition temperatures (Tgs) increased from 221 to 278 ^oC with increasing the content of 4,40-bis(4-fluorophthalimido) diphenyl ether moiety in the copolymerization. The 5% weight loss temperatures (T5%) of PEKI-C (a-e) reached up to 472-495 ^oC in nitrogen and 466e481 C in air. Flexible films, which could be easily cast from the polymer solutions, exhibited good mechanical properties with tensile strengths of 73-124 MPa, elongations at break of 9.7e12.8%, and tensile moduli of 2.2e2.8 GPa. Their films with cut-off wavelengths from 336 to 368 nm were transparent and essentially colorless. It is noted that the Tg, T5%, tensile strengths, elongations at break, and tensile moduli of PEKI-C (a-e) increased with increasing the content of 4,40-bis(4-fluorophthalimido)diphenyl ether in the copolymerization.