铋粉对PP熔融流变性能及成纤性能的影响

采用熔融共混法制备铋/聚丙烯共混材料(Bi/PP),利用旋转流变仪对其熔融流变特性进行测试分析。再通过熔融纺丝法制备初生纤维,采用扫描电镜、单纤维强力仪等对初生纤维的结构及性能进行表征。研究表明:共混材料表现非牛顿流体特性;共混材料的表观黏度与温度及剪切速率呈负相关;相同温度下,随铋粉含量增加,共混物的表观黏度也相应上升,铋粉在PP基体中的分散性较好但团聚增多,初生纤维内部孔隙结构增多,力学性能有所降低。

Influence of Bi powder on melt rheological and fiber forming properties of PP

Bismuth(Bi)/polypropylene(PP)blends were prepared by melt blending,and its melt rheological properties were investigated by rotational rheometer.The structure and properties of as-spun fibers were characterized by scanning electron microscopy and fiber strength tester.The results showed that Bi/PP exhibited non-newtonian fluid properties.The apparent viscosity of Bi/PP was negatively correlated with temperature and shear rate.At the same temperature,the apparent viscosity of the blend increased with the increase of Bi powder,but its agglomeration increased.Although Bi powder had good dispersibility in PP matrix.Moreover,the internal pore structure of asspunfiber increased with the increase of Bi powder,resulting in decreased mechanical properties.