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Synthesis and characterization of novel polyaspartimides derived from 2,2′‐dimethyl‐4,4′‐bis(4‐maleimidophenoxy)biphenyl and various diamines
Author(s) -
Liaw DerJang,
Liu Daniel ChunHung,
Liaw BeenYang,
Ho TongIng
Publication year - 1999
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(19990711)73:2<279::aid-app14>3.0.co;2-w
Subject(s) - thermogravimetric analysis , biphenyl , differential scanning calorimetry , polymer chemistry , tetrahydrofuran , thermal stability , polymer , glass transition , dimethylformamide , maleic anhydride , materials science , dimethylacetamide , chemistry , solvent , organic chemistry , copolymer , physics , thermodynamics
A novel bismaleimide, 2,2′‐dimethyl‐4,4′‐bis(4‐maleimidophenoxy)biphenyl, containing noncoplanar 2,2′‐dimethylbiphenylene and flexible ether units in the polymer backbone was synthesized from 2,2′‐dimethyl‐4,4′‐bis(4‐aminophenoxy)biphenyl with maleic anhydride. The bismaleimide was reacted with 11 diamines using m ‐cresol as a solvent and glacial acetic acid as a catalyst to produce novel polyaspartimides. Polymers were identified by elemental analysis and infrared spectroscopy, and characterized by solubility test, X‐ray diffraction, and thermal analysis (differential scanning calorimetry and thermogravimetric analysis). The inherent viscosities of the polymers varied from 0.22 to 0.48 dL g −1 in concentration of 1.0 g dL −1 of N , N ‐dimethylformamide. All polymers are soluble in N ‐methyl‐2‐pyrrolidone, N , N ‐dimethylacetamide, N , N ‐dimethylformamide, dimethylsulfoxide, pyridine, m ‐cresol, and tetrahydrofuran. The polymers, except PASI‐4, had moderate glass transition temperature in the range of 188°–226°C and good thermo‐oxidative stability, losing 10% mass in the range of 375°–426°C in air and 357°–415°C in nitrogen. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 279–286, 1999