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Toughness of epoxies modified by preformed acrylic rubber particles
Author(s) -
Levita Giovanni,
Marchetti Augusto,
Lazzeri Andrea
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910410115
Subject(s) - materials science , natural rubber , composite material , acrylonitrile , isophorone diisocyanate , copolymer , diglycidyl ether , particle size , toughness , viscosity , epoxy , bisphenol a , polymer , chemical engineering , polyurethane , engineering
A bisphenol‐A diglycidyl ether resin, cured with isophorone‐diamine at 60°C, was modified by means of preformed core‐shell acrylic rubber particles. Blends with rubber contents up to 30 phr by wt were tested. The fracture toughness depended linearly on the amount of rubber and significant improvement was found. No deterioration of temperature resistance was also observed. The viscosity of resin/modifier mixtures was controlled by means of antifoaming agents. A comparison with liquid acrylonitrile‐butadiene copolymers showed that core‐shell particles are efficacious tougheners. The effect of a bimodal particle size distribution was considered. In the size range investigated (0.2+5μm) no synergic effect was observed.