聚丙烯/冷冻胶粉复合材料结构与性能的研究

Study on Morphology and Properties of Polypropylene/ Liquid-Nitrogen-Cryogenic Rubber Powder Compounds

采用熔融挤出的方法制备聚丙烯(PP)、冷冻胶粉(LGTR)、相容剂及增韧剂的共混物,研究了胶粉用量、相容剂种类和用量及增韧剂对共混体系力学性能和微观结构的影响。结果表明,LGTR的加入会降低PP的力学性能,但随着LGTR用量的增加,共混体系的冲击强度上升;相容剂的使用会增加PP与LGTR的相容性,使力学性能提高;热塑性聚烯烃类弹性体(POE)和三元乙丙胶接枝马来酸酐(EPDM-g-MAH)的使用可以有效提高PP/胶粉共混体系的缺口冲击强度,并且增韧剂的使用可以提高PP与LGTR之间的相容性;高密度聚乙烯(PE-HD)/POE并用做增韧体系时,可以进一步提升共混体系的韧性,提高冲击强度。

The polypropylene (PP)-based compounds with liquid-nitrogen-cryogenic rubber powders (LNCRP) were prepared by melt extrusion, and their mechanical properties and morphologies were investigated. The result indicated that the addition of LNCRP resulted in a decrease in mechanical properties but an increase in notched impact strength. The incorporation of compatibilizer could lead to an improvement of mechanical properties. The notched impact strength and compatibility of the compounds were also improved with the addition of polyolefin thermoplastic elastomer (POE) and EPDM grafted with maleic anhydride. In addition, the impact resistance of the compounds could be further improved by using high-density polyethylene and POE as impact modifiers.