PP/Talc/MA-SEBS复合材料的力学性能研究

The Mechanical Properties of PP/Talc/MA-SEBS Composite

选用MA-SEBS为增容剂,制备了PP/滑石粉(Talc)/MA-SEBS复合材料,研究了Talc和MA-SEBS的含量对复合材料力学性能的影响。结果表明,单纯加入一定量Talc可以明显提高PP冲击强度,再加入MA-SEBS后,复合材料的冲击强度进一步增加。MA-SEBS除了作为相容剂,也充当增韧剂。刚性粒子Talc使材料的弯曲强度明显增大,弯曲模量随Talc含量增加而增大;而弹性体MA-SEBS使材料弯曲性能明显变差。单纯加入Talc对PP的拉伸性能无负面影响;若同时加入Talc和MA-SEBS,材料的拉伸强度明显下降,且MA-SEBS含量越大降幅越大。

PP/Talc composites compatibilized by MA-SEBS（maleic anhydride grafted styrene-（ethylene-co-butylene）-styrene copolymer） were prepared by melt extrusion,followed by injection molding.The effects of Talc and MA-SEBS on mechanical properties of PP/Talc/MA-SEBS composites were systematically investigated.The results indicated that Talc mixing into PP could obviously improve the impact strength of PP at room temperature.After the entry of MA-SEBS to the PP/Talc composites,the impact strength increased even more.MA-SEBS acted as a toughening agent as well as a compatilizer,enhancing the toughening effect of Talc.The rigid Talc particles made the flexural strength increase markedly,and the flexural moduls go up with the increase of Talc content;and elastomer MA-SEBS got the flexural performance of composites obviously deteriorated.Talc had no bad effect on the PP tensile properties;if adding Talc and MA-SEBS at the same time,the tensile strength would go down,and tend to decrease with increasing MA-SEBS content in the composites.