Synthesis and properties of PC-PMMA and PC-SAN block copolymers

초록

Vinyl moiety-terminated. polycarbonate(PC) was synthesized by interfacial polymerization of bisphenol-A using triphosgene catalyst and p-isopropenylphenol as a chain terminator. PC-PMMA and PC-SAN copolymers with varying block lengths and ratios were prepared by addition polymerization of PC controlled molecular weight and MMA or styrene-acrylonitrile monomer having various weight fractions. The yield and molecular weight of SAN polymer increased with increasing polymerization time. Thus, variation of polymerization time controlled the block lengths and ratios of the resulting PC-SAN copolymers. The structure, block lengths and block ratios of these copolymers were investigated from the measurements of GPC, FT-IR, elemental analysis, and H-1-NMR. PC-PMMA and PC-SAN copolymers were extracted with acetone to remove SAN or PMMA homopolymer. When the PC-SAN copolymers were used in compatibilizer of PC/SAN blends, the particle size of dispersed phase was decreased to 4 similar to 7 mu m.

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