以磷酸酯化合物为内给电子体的球型齐格勒纳塔催化剂,在本体-气相聚合装置上制备了己烷可溶级分含量不同的高熔融指数的聚丙烯釜内合金,考察了其微观形态与力学性能.结果表明,随己烷可溶组分含量的增加,冲击强度明显增加,冲击强度从4.4 kJ/m2增加至52.7 kJ/m2,弯曲强度和拉伸强度略有减小.拉伸强度从28.6 MPa下降至19.5 MPa,弯曲强度从37.2 MPa下降至21.5 MPa.扫描电子显微镜照片显示,橡胶相均匀分散在聚丙烯基体中形成“核-壳”结构.
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