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Transparent and organosoluble cardo polyimides with different trans / cis ratios of 1,4‐diaminocyclohexane via aromatic nucleophilic substitution polymerization
Author(s) -
Tang Yongmei,
Li Lan,
Ma Kai,
Chen Guofei,
Wang Wei,
Fang Xingzhong
Publication year - 2018
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5556
Subject(s) - polyimide , solubility , glass transition , materials science , polymerization , polymer , thermal stability , polymer chemistry , nucleophilic substitution , cyclohexane , phenolphthalein , condensation polymer , organic chemistry , chemistry , nanotechnology , composite material , layer (electronics)
Two series of cardo polyimides were prepared from 1,4‐bis(4‐fluorophthalimide)cyclohexane with different trans / cis ratios and phenolphthalein/ o ‐cresolphthalein via aromatic nucleophilic substitution reaction. The inherent viscosities of the synthesized polymers were found to be 0.55–0.66 dL g −1 in N , N ′‐dimethylacetamide. The cardo polyimides showed excellent solubility in organic solvents, high glass transition temperatures ( T g ) of 275–312 °C and moderate thermal stability with 5% weight loss temperatures ( T d5% ) of 415–441 °C in nitrogen and 370–436 °C in air. The polyimide films exhibited high optical transparency with cut‐off wavelengths of 350–355 nm and moderate mechanical properties. The different properties of the polymers caused by trans and cis configurations of 1,4‐diaminocyclohexane were also investigated. It was found that with an increasing content of trans configuration of 1,4‐diaminocyclohexane in the polyimide backbone, T g of the polyimides increased as well as T d5% , while the solubility gradually decreased. The polyimide films had good optical transparency regardless of trans / cis configuration. © 2018 Society of Chemical Industry