β晶型等规聚丙烯/POE增韧体系的结晶和力学性能

THE MECHANICAL AND MELTING CRYSTALLIZATION PROPERTIES OF β-FORM POLYPROPYLENE/POE BLENDS

研究了在β晶聚丙烯中加入不同质量分数POE的增韧体系的力学性能,通过差示扫描量热法(DSC)对聚丙烯的晶型进行了研究。结果表明,β晶型等规聚丙烯/POE增韧体系具有高的冲击强度,经过0.3%β晶成核剂处理的聚丙烯与质量分数为25%的POE增韧体系的冲击强度是未经处理的聚丙烯/POE增韧体系的1.5倍,是纯聚丙烯的12倍;与单纯的POE增韧聚丙烯相比,消除了脆韧转变点;试样在拉伸前后呈现明显的β晶型向α晶型的转变。

The effect of various POE content on the mechanical properties of 0.3%β-form crystalline nucleated agent treated PP/POE blend were investigated for fixed filler loading of 0～25%, and the β-form crystalline of the blend were analyzed by DSC. The result reveals that nucleated agent treated PP/POE sample exhibits a greater notched Izod impact strength. With the increase of POE content, brittle-ductile transition（BDT） of the untreated PP/POE occurs in the impact tensile test. While the treated PP/POE blend does not exhibit such transition. The transition of β→α form of treated PP/POE blend in tensile strength test were also discussed.