HTBN型聚氨酯弹性体的热性能和动态力学性能研究

Study on Thermal Performances and Dynamic Mechanical Properties of HTBN Polyurethane Elastomer

以端羟基聚丁二烯-丙烯腈共聚物(HTBN)为主要原料,采用浇铸工艺制备聚氨酯弹性体(PUE),通过热重分析仪(TG)、动态热机械分析仪(DMA)研究了聚醚(酯)多元醇种类、相对分子质量、用量以及二异氰酸酯种类对PUE的耐热性能、动态力学性能的影响。实验结果表明:主链含有杂原子(—O—)或氨基甲酸酯键密度过高均会对PUE的耐热性能产生一定影响;聚醚(酯)多元醇的引入导致PUE的储存模量、损耗模量变化温区加宽,聚醚多元醇的引入致使分子间作用力减小,PUE的储存模量、损耗模量下降,聚酯多元醇的影响刚好相反。

Polyurethane elastomer （PUE） was prepared employing casting method using hydroxy - terminated butadiene-acrylonitrile copolymer （HTBN） as the main raw materials. The effects of the kinds, molecular weight and dosage of polyether polyol（ polyester polyol）and the kinds of diisocyanate on the heat resistance and the dynamic mechanical properties of PUE were studied by the thermogravimetric analyzer （TG） and dynamic thermomechanical analyzer （DMA）. The results showed that the hetero - atom （ - O - ） contained in main chain or too high urethane link density will affect the heat resistance of PUE. The range of storage modulus and loss modulus of PUE changing with temperature widened due to the introduction of polyether （ester） polyol. The introduction of polyether polyol led to the intermolecular force decreasing, and the storage modulus and loss modulus of PUE reducing.