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Studies on modified phenolic resin. Iv: Properties of phenolic resin modified with 4‐hydroxyphenyl‐ maleimide/ n ‐butylacrylate copolymers
Author(s) -
Matsumoto Akihiro,
Hasegawa Kiichi,
Fukuda Akinori
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990300110
Subject(s) - copolymer , glass transition , maleimide , materials science , hexamethylenetetramine , thermal decomposition , flexural strength , polymer chemistry , monomer , composite material , decomposition , polymer , chemistry , organic chemistry
Three 4‐hydroxyphenylmaleimide/ n ‐butylacrylate (HPMI/ n ‐BuA) copolymers with different monomer ratios were synthesized. Their average molecular weights, glass transition temperatures ( T , g ), and thermal decomposition temperatures were measured. It was found that these copolymers had higher average molecular weights and higher thermal decomposition temperatures than novolac. Modified phenolic resins were prepared by transfer moulding from moulding compounds consisting of novolac, the copolymer, hexamethylenetetramine (hexamine), and glass fibre. Properties of the three kinds of modified phenolic resins were examined by flexural test, impact test, dynamic thermomechanometry, and observation of morphology. It was found that phenolic resin modified with HPMI/ n ‐BuA (1/3‐6) copolymer and modified with HPMI/ n ‐BuA (1/7‐0) copolymer showed good toughness and good heat resistance. It was also found that the heat resistance of modified phenolic resins was improved by after‐cure, but the mechanical properties were decreased by after‐cure: similar behaviour was observed for unmodified phenolic resin.