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Properties of networks obtained by internal plasticization of epoxy resin with aromatic and aliphatic glycidyl compounds
Author(s) -
Misaki Toshikazu,
Hirohata Takeshi,
Yoshii Minoru,
Hamasaki Takehiko
Publication year - 1989
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.1989.070370913
Subject(s) - epoxy , materials science , izod impact strength test , ultimate tensile strength , composite material , plasticizer , toughness , fracture toughness , natural rubber , elongation , impact resistance
In order to improve the fracture properties of p , p ′‐diaminodiphenylmethane‐cured epoxy resin, various kinds of aromatic and aliphatic glycidyl compounds were investigated as a modifier at an amount of 30 wt %. Several compounds promoted the fracture toughness. In any glycidyl compounds, however, heat resistance was decreased by the modification. The dynamic mechanical properties of the modified epoxy resins were measured. The crosslinking density ρ was calculated from the theory of rubber elasticity, and the mechanical properties of the resins were discussed in regard to the crosslinking density. Tensile strength was scarcely affected by the crosslinking density. Elongation at break and Izod impact strength increased remarkably with decrease in crosslinking density. The fracture toughness K Ic ‐ increased with decrease in crosslinking density except at small ρ.