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聚烯烃塑性体(POP)由乙烯与丙烯通过独特的茂金属催化剂生产,其力学性能介于弹性体和塑料之间,经常作为增韧材料改善聚丙烯的力学性能。本文通过聚烯烃塑性体与高流动性PP(HFPP)熔融共混,制备具有高透明性的PP材料,并利用透明率测定仪、差示扫描量热仪(DSC)、偏光显微镜(PLM)等对改性前后高流动PP透明性、力学性能、结晶行为和球晶大小等进行表征。通过大量工艺、配方优化,采用POP3000与HFPP进行熔融共混后,其共混物具有良好的透明性。通过对其力学性能分析,POP与HFPP共混物的耐冲击性能,弯曲模量和弯曲强度相对于HFPP显著提高,POP能够减小HFPP球晶尺寸的大小,非等温结晶动力学研究发现Mo法能很好地描述POP/HFPP共混体系的结晶过程。
Polyolefin plastomers (POPs) are produced from ethylene and propylene via unique metallocene catalysts with mechanical properties ranging from elastomers to plastics and often improve the mechanical properties of polypropylene as a toughening material. In this paper, a PP material with high transparency was prepared by melt blending of a polyolefin plastomer and a high fluidity PP (HFPP). The transparency of the PP material was measured by using a transparency tester, a differential scanning calorimeter (DSC), a polarization microscope Before and after modification of high flow PP transparency, mechanical properties, crystallization behavior and spherulite size were characterized. Through a large number of processes, formula optimization, the use of POP3000 and HFPP melt blending, the blend has good transparency. Through the analysis of its mechanical properties, the impact strength, flexural modulus and flexural strength of POP and HFPP blends were significantly increased compared with that of HFPP. POP can reduce the size of HFPP spherulites. Non-isothermal crystallization kinetics showed that the Mo method It can well describe the crystallization process of POP / HFPP blends.