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Citation: Chen Li, Huang Ying. Modification of Epoxy Molding Compounds with Epoxy-terminated Polydimethylsiloxane[J]. Chinese Journal of Applied Chemistry, ;1995, 12(5): 67-72. shu

Modification of Epoxy Molding Compounds with Epoxy-terminated Polydimethylsiloxane

Chen Li ,
Huang Ying

Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080

Received Date: 12 December 1994
Revised Date: 7 June 1995

This paper concerns with lowering the internal stress of epoxy molding com-pounds by incorporation of epoxy-terminated polydimethylsiloxanes. When the modifier was blended with epoxy resin and novolac resin curing agent directly,surface bleeding of the polysiloxane occurred. When the polysiloxane was first prereacted with the novolac resin to form a block copolymer and then blended with the epoxy resin,the polysiloxane bleeding was prevented,the polysiloxane phase was smaller in size and the domain distribution in the resin matrix was more even. The main factors influencing the internal stress were investigat-ed. It was found that the domain size of the polysiloxane phase depended on the synthetic conditions of the copolymers,the length of polysiloxane chain and the content of polysilox-ane in the cured resin. The flexural modulus of the epoxy molding compounds depended mainly on the interface area between the polysiloxane phase and the resin matrix, while the thermal expansion coefficient below T_g was dependent not only on the interface area between the two phases,but also on the interaction between the resin/filler matrix and polysiloxane phase to a great extent.
- polysiloxane,
- epoxy resin,
- internal stress,
- mechanical property,
- morphology
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