聚丙烯/尼龙6挤出原位成纤后的牵引作用

用挤出机共混挤出聚丙烯和尼龙6，加工中尼龙6作为分散相在聚丙烯中形成微纤。改变挤出物挤出模口后所受的牵引作用的速度会产生材料形态与力学性能的变化。发现随牵引速度的提高，尼龙6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，随牵引速度的增加聚丙烯与尼龙6的相容性略有提高，X-射线衍射分析表明拉伸作用对尼龙纤维晶体中分子链的取向无影响。

Influence of draw rate on PP/PA6 in-situ composite

Polyproylene (PP) and polyamide6 (PA6) were blended and extruded with a single screw extruder. The change in morphology and mechanical properties of PP/PA6 in-situ composite with the changing draw rate was investigated. PA6 being the dispersed phase could from microfibrils in PP matrix. 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 showed that the compatibility of PP and PA6 was 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 0.