Premium
Toughening of aromatic diamine‐cured epoxy resins by poly(butylene phthalate)s and the related copolyesters
Author(s) -
Iijima Takao,
Miura Satoru,
Fujimaki Masanori,
Taguchi Takasi,
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(19960705)61:1<163::aid-app18>3.0.co;2-8
Subject(s) - diglycidyl ether , epoxy , materials science , polyester , phthalate , diamine , polymer chemistry , bisphenol a , toughening , toughness , composite material
Aromatic polyesters, prepared by the reaction of aromatic dicarboxylic acids and 1,4‐butanediol, were used to improve the toughness of bisphenol‐A diglycidyl ether epoxy resin cured with p,p′ ‐diaminodiphenyl sulfone. These polyesters contained poly(butylene phthalate)s (PBP), poly(butylene phthalate‐ co ‐butylene isophthalate)s, poly(butylene phthalate‐ co ‐butylene terephthalate)s, and poly(butylene phthalate‐ co ‐butylene 2,6‐naphthalene dicarboxylate)s. All aromatic polyesters used in this study were soluble in the epoxy resin without solvents and were found to be effective as modifiers for toughening the cured epoxy resin. For example, the inclusion of 20 wt % PBP (MW 16,300) led to a 120% increase in the fracture toughness ( K IC ) of the cured resin with no loss of mechanical and thermal properties. The toughening mechanism was discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified epoxy resin system. © 1996 John Wiley & Sons, Inc.