PEW-g-MAH的制备及其对PP/Talc的改性

由线型低密度聚乙烯裂解反应制备了低相对分子质量聚乙烯蜡，考察了工艺条件的影响因素。得出了反应温度、反应时间与相对分子质量、熔点、软化点之间的关系。在锅中用熔融接枝法制备马来酸酐接枝聚乙烯蜡，研究了反应时间、温度、引发剂和马来酸酐用量对产物接枝率、接枝效率的影响。结果表明在引发剂质量分数0．1％、马来酸酐质量分数4％、反应温度150℃、反应时间3h的条件下，聚乙烯蜡的接枝率达到1.49％。接枝的聚乙烯蜡可作为一种新型偶联剂用于改性聚丙烯与填料复合材料的力学性能，使改性后的聚丙烯复合材料的悬臂粱缺口冲击强度提高了50％。

PREPARATION OF PEW-g-MAH AND ITS MODIFICATION ON PP/TALC COMPOSITES

The polyethylene wax (PEW) was gained by pyrolysis from linear low density polyethylene (LL-DPE). Relations between the reaction time or temperature and molecular weight,melting point,and softening temperature of PEW were gained through investigating factors in pyrolysis. The maleic anhydirde (MAH) was grafted to PEW by melting grafting in reacting pot. The effects of grafting time, temperature, the amount of initiator and maleic anhydride on grafting rate and grafting effect were primarily investigated. The results indicate that the grafting rate of the PEW-g-MAH arrives at 1. 49% when grafting time is 3 h, temperature is 150 'C , the amount of initiator is 0. 1%, and the content of MAH is 4%. MAH-g-PEW can be used as a kind of novel coupling agent to modify the mechanical performance of polypropylene and filler composites. Izod notched impact strength of composites with filler modified PEW-g-MAH increases by 50%.