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Synthesis of organosoluble and light‐colored cardo polyimides via aromatic nucleophilic substitution polymerization
Author(s) -
Liu Jiangtao,
Chen Guofei,
Mushtaq Nafeesa,
Fang Xingzhong
Publication year - 2015
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3574
Subject(s) - materials science , glass transition , solubility , ultimate tensile strength , polymerization , polyimide , nucleophilic substitution , nucleophilic aromatic substitution , polymer chemistry , polymer , transmittance , chemical engineering , composite material , organic chemistry , layer (electronics) , chemistry , optoelectronics , engineering
A series of cardo polyimides (PIs) containing large‐volume cardo groups were prepared via aromatic nucleophilic substitution polymerization of bisphenols and bis(fluorophthalimide)s. This series of cardo PIs show excellent solubility in a variety of organic solvents. The glass transition temperatures ( T g s) of these PIs are recorded from 217°C to 293°C, the 5% weight loss temperatures ( T 5% ) reach up to 495–536°C in air and 487–531°C in nitrogen, respectively. Flexible films, which could be cast from the polymer solutions, exhibit good mechanical properties with tensile strengths of 118–127 MPa, elongations at break of 10.6–15.4% and tensile moduli of 2.3–2.8 GPa. Their films with cut‐off wavelengths from 342 to 423 nm are essentially colorless, and the transmittance of these cardo polyimide films is over 80% between 450 and 800 nm. It is noted that cardo PIs possess better solubility, higher glass transition temperature, and better optical transparency than linear PIs. Copyright © 2015 John Wiley & Sons, Ltd.