工艺参数对聚丙烯/聚酰胺6共混材料WAIM管件性能及微观形态的影响

基于自行搭建的水辅助注射成型(WAIM)实验平台对聚丙烯/聚酰胺6（PP/PA6）共混材料进行WAIM实验，探究工艺参数对PP/PA6共混材料的WAIM管件的残余壁厚、表观质量及力学性能的影响，并进行了微观形态观测。结果表明，随着熔体温度、模具温度和注水压力的增加，塑件残余壁厚逐渐减小；随着注水延迟时间的增加，塑件残余壁厚逐渐增大；随着模具温度、注水延迟时间的增加，管件拉伸强度逐步增大；随着熔体温度、注水压力的增大，管件拉伸强度逐步减小；工艺参数通过温度场的变化影响熔体的成核和晶体长大从而影响结晶度，结晶度越高，管件的拉伸强度越高。

Effect of Processing Parameters on Quality and Micromorphology of WAIM Pipes Based on Polypropylene/Polyamide 6 Blends

A water-assisted injection molding (WAIM) experiment was carried out for polypropylene (PP)/polyamide 6 (PA6) blends on a lab-developed WAIM experimental platform. The experimental and theoretical methods were combined to investigate the effect of processing parameters on the residual wall thickness (RWT), surface quality and mechanical properties of the pipe obtained from WAIM. The results indicated that the RWT decreased gradually with increasing the melt temperature, mold temperature and water injection pressure, and however it increased with an increase in water injection delay time. Moreover, the tensile strength of the pipe increased gradually with the increase of mold temperature and water injection delay time. Nevertheless, when the melt temperature and water injection pressure were improved, the tensile strength tended to decrease gradually. The processing parameters affected the temperature field and therefore influencedthe nucleation and crystal growth as well as the final crystallinity. The higher the degree of crystallinity, the higher was the tensile strength of the pipes.