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Effect of matrix compositions on modification of bismaleimide resin by N ‐phenylmaleimide–styrene copolymers
Author(s) -
Iijima Takao,
Nishina Tsutomu,
Fukuda Wakichi,
Tomoi Masao
Publication year - 1996
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(19960404)60:1<37::aid-app5>3.0.co;2-w
Subject(s) - copolymer , materials science , glass transition , composite material , flexural strength , styrene , flexural modulus , maleimide , phase (matter) , polymer chemistry , toughness , dynamic mechanical analysis , polymer , chemistry , organic chemistry
The effect of matrix compositions on the toughening of bismaleimide resin by modification with N ‐phenylmaleimide–styrene copolymers (PMS) were examined. The bis‐maleimide resin was composed of 4,4′‐bismaleimidediphenyl methane (BMI), o,o ′‐diallyl bisphenol A (DBA), and triallyl isocyanurate (TAIC). The matrix structure was controlled by changing the equivalent ratio of the two allyl components (DBA and TAIC). Morphologies of the modified resins changed from particulate to cocontinuous and to inverted phase structures, depending on the modifier content. The most effective modification for the cured resins could be attained because of the cocontinuous structure of the modified resins. Inclusion of TAIC led to a decrease in the extent of dispersion of the cocontinuous phase, and the optimum matrix structure to improve the toughness was obtained on 20 eq % addition of TAIC. For example, when using 20 eq % of TAIC and 5 wt % of PMS ( M w 303,000), the fracture toughness ( K ic ) for the modified resins increased 100% at a moderate loss of flexural strength and with retention in flexural modulus and the glass transition temperature, compared to those of the unmodified cured Matrimid resin. © 1996 John Wiley & Sons, Inc.