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Thermal behavior and cured products of mixtures of two different bismaleimides
Author(s) -
Nagai Akira,
Takahashi Akio,
Suzuki Masao,
Katagiri Junichi,
Mukoh Akio
Publication year - 1990
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.1990.070410927
Subject(s) - melting point , differential scanning calorimetry , monomer , materials science , propane , thermal stability , polymer chemistry , enthalpy of fusion , chemical engineering , composite material , thermodynamics , chemistry , organic chemistry , polymer , physics , engineering
Abstract The thermal behavior of a new Bismaleimide, 2,2‐bis[4‐(4‐maleimidophenoxy)phenyl]propane (BBMI) and its mixtures with a conventional monomer, bis(4‐maleimidophenyl)methane (BMI) were investigated by differential scanning calorimetry. The melting point of BBMI was 142°C, lower than that of BMI, although its molecular weight is about twice that of BMI. Each of these bismaleimides and their mixtures showed a melting point when heating, but did not have a distinct freezing point when cooling because of vitrification. The unobserved freezing curve was estimated by calculation based on Schröder's equation using melting point and molar heats of fusion in both bismaleimides. The cured product of BBMI has thermal stability as good as that of BMI. Moreover, the cured product of BBMI has a high flexurai strength and a high flexural elongation owing to the introduction of flexible ether bonds and long phenoxy groups within the monomer structure.