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Preparations and properties of a high performance semicrystalline copolyimide and composites reinforced with glass fiber
Author(s) -
Wang Wei,
Zhou Hongwei,
Chen Dongfeng,
Wu Meimei,
Liu Yuntao,
Chen Chunhai
Publication year - 2014
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.40345
Subject(s) - materials science , differential scanning calorimetry , crystallinity , composite material , glass transition , phthalic anhydride , crystallization , composite number , fiber , dynamic mechanical analysis , glass fiber , isothermal process , rheometry , polymer chemistry , chemical engineering , polymer , organic chemistry , chemistry , catalysis , physics , engineering , thermodynamics
A semicrystalline copolyimide derived from 3,3′,4,4′‐biphenyltetracarboxylic dianhydride ( s ‐BPDA), 1,3‐bis‐(4‐aminophenoxy)benzene (TPER), and 4,4′‐oxydianiline (4,4′‐ODA), end capped with phthalic anhydride (PA), was synthesized. Glass fiber reinforced composite was also prepared by impregnating powdery glass fiber with poly(amic acid) followed by solution imidization techniques. This copolyimide displayed a glass transition temperature of 202°C and a melting temperature of 373°C by differential scanning colorimeter (DSC). Crystallization and melting behaviors were investigated under nonisothermal and isothermal crystallization conditions. Double exothermic peaks were found by DSC when the copolyimide was cooled from the melt and multiple melting behaviors can be observed after the coployimide had been isothermally crystallized at different temperatures. Mechanical properties were investigated by dynamical mechanical analysis (DMA) and tensile experiments. The samples were cured at different temperatures and then tested at different temperatures. Results indicated that the copolyimide and the composite showed excellent mechanical properties. Additionally, this copolyimide also showed lower melt viscosity by rheological analysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40345.