拉伸作用对PP/PA6原位成纤复合体系的影响

INFLUENCE OF DRAW RATE ON PP/PA6 IN SITU COMPOSITE

将聚丙烯（ＰＰ）与尼龙６（ＰＡ６）共混，在挤出加工中ＰＡ６作为分散相可以在ＰＰ基体中成纤。改变挤出物挤出模口后所受的牵引作用的速度，研究了由此产生的材料形态与力学性能的变化规律。发现随牵引速度的提高，ＰＡ６微纤的平均直径变小，尺寸分布更均匀，力学性能也随之提高。差热分析表明，随牵引速度的增大ＰＰ与ＰＡ６的相容性略有提高，Ｘ射线衍射分析表明拉伸作用对ＰＡ６纤维晶体中分子链的取向无影响。

Polypropylene(PP) and polyamide 6(PA6) were blended and extruded with a single screw extruder, PA6 being the dispersed phase could form microfibrils in PP matrix. That the change in morphology and mechanical properties of PP/PA6 in situ composite with the changing draw rate was investigated. The average diameter of PA6 fibrils decreased with the increasing draw rate, and the diameter distribution of fibrils became narrow, the mechanical properties were improved. DSC results show that the compatibility of PP and PA6 is improved slightly with the increasing draw rate. The orientation of PA6 molecular chains didn′t change with the changing draw rate by the X ray diffraction result, the orientation degree was zero.