Synthesis, Curing and Properties of Silicone-Epoxies

  • Huang, Wei (Lab of High-Tech Materials, Institute of Chemistry, Chinese Academy of Science) ;
  • Yuan, Youxue (Lab of High-Tech Materials, Institute of Chemistry, Chinese Academy of Science) ;
  • Yu, Yunzhao (Lab of High-Tech Materials, Institute of Chemistry, Chinese Academy of Science)
  • Received : 2006.11.09
  • Accepted : 2006.11.22
  • Published : 2006.12.30

Abstract

A new kind of silicone-epoxy composite is reported in this research. The silicone-epoxy resin was synthesized by the hydrosilylation of tetramethycyclotetrasiloxane and 4-vinyl-1-cyclohexene 1,2-epoxy with a high reaction yield. It was found that the obtained silicone-epoxy resin shows a high reactive activity to the aluminum complex-silanol catalyst. The resin could be cured under the catalysis of $(Al(acac)_3/Ph_2Si(OH)_2$ at a concentration below 0.1 wt% to give a hard cured resin showing excellent optical clarity, UV resistance and thermal stability. It was also found that the Si-H groups facilitated the curing reaction and the silicone-epoxy resin bearing Si-H group could be cured effectively even if $Ph_2Si(OH)_2h$ was absent. Moreover, the UV resistance and thermal stability were improved significantly by the introduction of Si-H groups. This is possibly due to the reductive property of Si-H groups which can annihilate radical and peroxide effectively. This kind of silicone-containing epoxy composite might have very promising applications as optical resin, optical adhesive and encapsulation materials for electronic devices.

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