Effect of Copolyetherimide on Preparation of Epoxy Resin Microspheres

A new kind of copolyetherimide(COPEI) is synthesized, and effect of contents of this kind of COPEI resin on morphology of blends of COPEI/the diglycidyl ether of bisphenol A(the Epikote 828)/ 4,4'-diamino diphenyl sulphone(DDS) and preparation of epoxy resin microspheres are researched . The results show that when COPEI resin is added to the blends, different phase structures are gotten. When content of COPEI resin is above 30 wt% , utter phase dispersions occur, furthermore with increasing of contents of COPEI resin, the dimensions of disperse phases (epoxy resin phases) gradually reduce, and the diameter and distribution of epoxy resin microspheres prepared also reduce gradually. The infrared spectral regions of epoxy resin microspheres show that there are not obvious impacts between pure epoxy resin and microspheres. The results of DSC of epoxy resin microspheres show that glass transition temperatures of epoxy resin microspheres are lower than that of pure epoxy resin, and with reducing of contents of COPEI resin in the blends, there is a more and more low tendency among glass transition temperatures of epoxy resin microspheres.