聚丙烯汽车内饰材料低温高速拉伸性能的研究

Study on Low-Temperatured High-Speed Tensile Properties of Polypropylene Automotive Interior Materials

将共聚聚丙烯(PP)、滑石粉(Talc)以及乙烯-辛烯共聚物(POE)在双螺杆挤出机中制备了车用聚丙烯材料,并采用高速拉伸、扫描透射电子显微镜(STEM)等方法研究了相容剂的加入对材料力学性能以及相形态的影响,同时采用逾渗理论探讨了增韧机理。结果表明,相容剂有效提高了材料在-30℃下的低温韧性。加入相容剂后,低温下材料的断裂伸长率明显提高,并且拉伸断裂形式从脆性断裂转变为韧性断裂。STEM测试结果表明,共混物呈现明显的海-岛结构,PP为连续相(海)。加入相容剂后,橡胶相POE在连续相中的粒径明显降低,并且分散更加均匀,说明相容剂的加入有效改善了共混物的相容性。

Polypropylene （PP） materials for automotive interior were prepared by using polypropylene, talcum powder and ethylene/octene copolymer （POE）. And the effect of the addition of compatibilizer on the mechanical properties and phase morphology of the materials was studied by high speed tensile test and scanning transmission electron microscopy （STEM）. The test results show that the compatibilizer improves the toughness of the material at low temperature of -30 ℃ significantly. After adding the compatiblizing agent, the breaking elongation at low temperature of the material is obviously increased, and the tensile fracture form is characterized by ductile fracture from brittle fracture. The STEM test results show that the blends show the apparent sea-island structure with PP as the continuous phase. After adding the compatibilizer, the grain diameter of POE as rubber phase in the continuous phase is decreased obviously and more evenly dispersed, the compatibility of the blends is improved effectively.