抄録
Epoxy resin is widely used in various industries due to its superior properties. Advancement of all the properties of epoxy resin is required by recent technology development, especially the poor toughness and heat resistance. Moreover, excellent adhesive properties for metals (e.g.; copper, gold, aluminum, silver etc.) to which it is hard to adhere, have also been desired for epoxy resin in the electric and electronics industrial fields in recent years. In order to achieve both an increase in the adhesive strength to metal and an improvement in the toughness of cured epoxy resin, the introduction of polymers containing sulfur, which has strong interaction with metals, was investigated. A polyester and polythioesters containing sulfur were employed as modifiers for epoxy resin. The effect of the added modifiers was evaluated by single-lap shear, Charpy impact and fracture toughness testing. The sulfur-containing polymers have a beneficial effect on the enhancement of the epoxy resin/metal junction. The most effective example was the addition of 20 phr of the MPS_7 polythioester to epoxy resin increased its adhesive strength to copper from 5.7 to 17 MPa. The addition of these modifiers was also effective in improving the impact strength of epoxy resin.
