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以端羟基丁腈橡胶和聚醚二醇、甲苯二异氰酸酯为原料制备出预聚体,加入混合扩链剂氢氧化甲基丙烯酸锌盐、二甲硫基甲苯二胺和过氧化二异丙苯,在聚氨酯固化过程中氢氧化甲基丙烯酸锌盐在过氧化二异丙苯的引发下发生自由基聚合形成离子聚合物,同时离子聚合物自由基活性链与聚氨酯软段结构中的不饱和双键反应形成交联,制备了离子聚合物邻接交联型聚氨酯弹性体。研究了离子聚合物对聚氨酯氢键化作用和高温力学性能的影响。结果表明,随温度升高聚氨酯氢键化NH官能团的伸缩振动谱带逐渐向高波数方向移动,离子聚合物邻接交联型聚氨酯的氢键化作用破坏较慢,复合材料的高温拉伸强度保持率相对较高。
A prepolymer was prepared from hydroxyl-terminated nitrile rubber, polyether glycol and tolylene diisocyanate, and a mixed chain extender, zinc hydroxide methacrylate, dimethylthiotoluenediamine and dicumyl peroxide , During the curing of polyurethane, the zinc hydroxide of zinc hydroxide undergoes free radical polymerization under the initiation of dicumyl peroxide to form an ionic polymer, and at the same time, the free radical active chain of the ionic polymer and the unsaturated bis Bond reaction to form a cross-linked, prepared an ionic polymer adjacent cross-linked polyurethane elastomer. The effects of ionic polymers on the hydrogen bonding and the mechanical properties at high temperature were studied. The results show that the stretching vibration bands of NH functional groups of polyurethane gradually shift to high wavenumbers as the temperature increases. The hydrogen bonding of the adjacent polymer to the cross-linked polyurethane is slower, and the high temperature tensile strength of the composites remains The rate is relatively high.