液状ポリブタジエン--不飽和ポリエステルブレンド系イソシアナ-ト架橋物に及ぼすビニルモノマ-の添加効果〔モノマ-による液状ゴムの架橋と補強-5-〕

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In this paper, the prepolymer was prepared by addition reaction of diisocyanate to polymer blend which was composed of liquid hydroxyl-terminated polybutadiene (HT-PB) and unsaturated polyester, and was cured with vinylmonomer and diol. The composite which was a cured mixture consisting of unsaturated polyester and HT-PB with vinylmonomer and diol showed undesirable mechanical properties because the solubility of unsaturated polyester for HT-PB was bad.Therefore, the prepolymer was prepared by addition reaction of diisocyanate to polymer blend obtained by mixing small amounts of unsaturated polyester into HT-PB (HT-PB/unsaturated polyester =75/25), and the prepolymer was cured with diol and vinymonomer [Styrene or methylmethacrylate (MMA)].As the result, it was made clear that the crosslinked composite was reinfored by a highly heat-dependent hard block consisting of unsaturated polyester and vinylmonomer and the morphology of crosslinked polymer was composed of the domain of unsaturated polyester-vinylmonomer copolymer and the domain of homopolymer which were dispersed in rubber matrix.Comparing styrene with MMA as crosslinking agent, the mechanical properties of composite cured with styrene turned out better than MMA. It could be considered that the result described above was attributable to the rate of homopolymerization of vinylmonomer and the rate of copolymerization of vinylmonomer and unsaturated polyester.