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Synthesis and properties of chain‐extended bismaleimide resins containing phthalide cardo structure
Author(s) -
Xiong Xuhai,
Chen Ping,
Yu Qi,
Zhu Nengbo,
Wang Baichen,
Zhang Jinxiang,
Li Jianfeng
Publication year - 2010
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.2900
Subject(s) - phthalide , thermogravimetric analysis , thermal stability , monomer , materials science , differential scanning calorimetry , fourier transform infrared spectroscopy , polymer chemistry , glass transition , phenolphthalein , solubility , chemical engineering , organic chemistry , chemistry , polymer , composite material , physics , engineering , thermodynamics
Three novel bismaleimide (BMI) monomers containing phthalide groups in their structures, i.e. 3,3‐bis[4‐(4‐maleimidophenoxy)phenyl]phthalide, 3,3‐bis[4‐(4‐maleimidophenoxy)‐3‐methylphenyl]phthalide and 3,3‐bis[5‐isopropyl‐4‐(4‐maleimidophenoxy)‐2‐methylphenyl]phthalide, based on phenolphthalein, o ‐cresolphthalein and thymolphthalein, respectively, were designed and synthesized. The chemical structures of the monomers were confirmed from 1 H NMR and 13 C NMR spectroscopy and Fourier transform infrared spectroscopy. These monomers exhibit good solubility in common organic solvents, enabling easy solution processing. The thermal curing behavior of the monomers was investigated using differential scanning calorimetry, displaying broad exothermic peaks and large thermal processing windows. Thermogravimetric analysis and dynamic mechanical analysis were used to characterize the thermal stability and thermal mechanical properties of the resulting BMI resins. The results, in contrast to bisphenol A‐based BMI resin, indicate that the incorporation of the phthalide structure into the polybismaleimide network can effectively improve the thermal properties. Water absorption tests of the cured products demonstrate the chemical structure has an effect on moisture resistance. Copyright © 2010 Society of Chemical Industry