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Synthesis and characterization of two polytrimellitamideimide series with different segment order by direct polycondensation
Author(s) -
Yang ChinPing,
Wei ChiShu
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994
Subject(s) - condensation polymer , imide , polymer chemistry , glass transition , polyamide , amide , polymerization , solubility , materials science , solvent , diamine , chemistry , polymer , organic chemistry
Poly(amide–imide) (PAI) could be synthesized in regular segment order from trimellitic anhydride (TMA) and various aromatic diamines. By different processes, PAI h‐h‐t‐t containing alternating (amide–amide)–(imide–imide) sequences and PAI h‐t containing amide–imide sequences could be obtained through direct polycondensation. Comparison of PAI h‐h‐t‐t and PAI h‐t , which had different sequence orders and were prepared from TMA and 12 diamines, showed that the latter had better solubility and needed less quantity of solvent and salt (CaCl 2 ) during polymerization, but both two series PAI using p ‐substituted diamines (e.g., p ‐phenylenediamine) showed poor solubility. Series PAI h‐h‐t‐t possessed larger initial modulus but smaller elongation at break than series PAI h‐t . For the thermal properties, most of series PAI h‐t had glass transition temperatures higher than corresponding series PAI h‐h‐t‐t , but these two series were similar in the 10% weight loss temperatures and the char yields at 800°C in nitrogen. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1556–1567, 2001