writer：Lan Li, Jiangtao Liu, Guofei Chen,* Lubo Xu, Nafeesa Mushtaq, Lala Rukh Sidra, Ruixin Wang, Xingzhon
keywords：Cardo poly(ether sulfone imide)s, transparent, aromatic nucleophilic substitution polymerization
source：期刊
specific source：High Perform. Polym.
Issue time：2016年

A series of cardo poly(ether sulfone imide)s (PESI-C) containing bulky phthalide groups were prepared via aromatic nucleophilic substitution reaction of phenolphthalein with 4,40-difluorodiphenyl sulfone and 4,40-bis(4-fluorophthalimido) diphenyl ether (BFPI). The glass transition temperatures and 5% weight loss temperatures in nitrogen of the resulting PESI-C increased from 258C to 278C and from 468C to 495C with increasing the content of imide moiety in the polymer chain, respectively. These PESI-C films were transparent and essentially colorless and exhibited good mechanical properties with tensile strengths of 91–124 MPa, elongations at break of 6.9–12.8%, and tensile moduli of 2.2–2.8 GPa, respectively. It is noted that the tensile strengths, elongations at break, and tensile moduli of PESI-C also

increased with increasing the content of BFPI in the copolymerization, indicating that the properties could be adjusted by controlling the ratio of BFPI and 4,40-difluorodiphenyl sulfone.