EVA对聚丙烯/抗菌沸石共混纤维成形及其性能的影响

通过在聚丙烯/无机粉体共混体系中添加乙烯-醋酸乙烯酯共聚物(EVA),研究了三元共混体系的纺丝成形性能和所得纤维机械性能。结果表明:对于多元复合粉体添加的功能体系而言,纺丝成形温度随复合粉体的添加而提高,但添加EVA可以在一定程度上改进共混体系的可纺性,降低纺丝成形温度;EVA的加入可同时改进聚丙烯(PP)/抗菌沸石(ZA)共混纤维的机械性能,这与ZA/EVA包覆结构的形成有关;相比较而言,在EVA添加量为2％(wt)的情况下,EVA28具有相对于EVA14、EVA21更好的纺丝成形性和较高的纤维机械性能。

Influcence of EVA on the Spinnability and Properties of PP/Inorganic Powder Blend Fiber

The spinnabilities and mechanical properties of polypropylene/inorganic powder blend fiber were studied with the addition of ethylene-vinyl acetate. It was found that the spinning temperature of polypropylene was increased with the addition of inorganic powder, but decreased with the addition of ethylene-vinyl acetate. The spinnability of the blend system was improved vvith the adding of ethylene-vinyl acetate, due to the change of the flow ability of the blend system. The mechanical properties of the blend fiber with addition of ethylene-vinyl acetate were also improved, this maybe due to the formation of a particular core-shell structure in the polypropylene/inorganic powder/ethylene-vinyl acetate blend system, as showed in SIM photograpy. Ethylene-vinyl acetate would act as a bridge between the matrix and the additive under the stress. The blend systme of ethylene-vinyl acetate with vinyl acetate content of 28 adding system showed the best spinnability and mechanical properties compare to the content of 21 and 18, and the results were according to the analysis of rheological properties.