增容剂对硅橡胶/热塑性聚氨酯热塑性硫化胶性能的影响

Effect of compatibilizers on properties of silicone rubber/thermoplastic polyurethane thermoplastic vulcanizates

采用动态硫化法制备了甲基乙烯基硅橡胶(MVQ)/热塑性聚氨酯(TPU)共混型热塑性硫化胶(TPV),考察了增容剂的种类及用量对TPV力学性能及加工流变性能的影响。结果表明,随着增容剂用量的增加,TPV的力学性能呈先上升后下降的趋势。相比于乙烯丙烯酸共聚物和乙烯与乙酸乙烯嵌段共聚物,用聚烯烃弹性体接枝马来酸酐(POE-g-MAH)作为增容剂时TPV的力学性能更为优异。3种增容剂均能提高TPV中MVQ相与TPU相的相容性。当POE-g-MAH的用量为6份时,TPV中MVQ相与TPU相的玻璃化转变温度靠近程度最大,两相界面较为模糊,增容效果最佳。

Methyl vinyl silicone rubber(MVQ)/thermoplastic polyurethane(TPU)blend thermoplastic vulcanizate(TPV)was prepared by dynamic vulcanization.The effects of type and amount of compatibilizers on mechanical properties and rheological properties of TPV were investigated.The results showed that the mechanical properties of TPV increased firstly and then decreased with the increase of compatibilizer amount.The mechanical properties of TPV were better when polyolefin elastomer grafted maleic anhydride(POE-g-MAH)was used as compatibilizer compared to ethylene acrylic copolymer and ethylene and vinyl acetate block copolymer.And all three kinds of compatibilizers could improve the compatibility of MVQ phase with TPU phase in TPV.When the amount of POE-g-MAH was 6 phr,the glass transition temperature of MVQ phase and TPU phase in TPV was the closest,the interface between the two phases was blurred and the capacitance effect was the best.