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Preparation of poly(amide‐imide)s derived from biphenyltetracarboxylic dianhydrides
Author(s) -
Shiotani Akinori,
Kohda Masafumi
Publication year - 1997
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/(sici)1097-4628(19970214)63:7<865::aid-app6>3.0.co;2-o
Subject(s) - thermogravimetric analysis , imide , polymer chemistry , differential scanning calorimetry , condensation polymer , materials science , glass transition , inherent viscosity , polyamide , polymer , dicarboxylic acid , bpda , chemistry , intrinsic viscosity , polyimide , organic chemistry , composite material , physics , layer (electronics) , thermodynamics
Four new diimide‐dicarboxylic acids (I–IV) were prepared by condensation of s‐ or a‐BPDA with para‐ or meta‐aminobenzoic acid. A series of aromatic poly(amide‐imide)s containing these diimide‐dicarboxylic units was prepared by three methods: (1) acid chloride method, (2) triphenylphosphite method, and (3) one‐pot method. A typical polymer of the series is readily soluble in polar aprotic solvents such as N‐methyl‐2‐pyrrolidone (NMP), dimethylsulfoxide (DMSO), and pyridine (py) and could be cast into tough and flexible films. These were characterized by inherent viscosity, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) measurements. The glass transition temperatures of these polymers were in the range of 220–290°C, and the 5% weight loss temperatures were 450–500°C. Films prepared by casting from polymer solutions exhibited good tensile properties. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 865–873, 1997