Morphological comparison of isotactic polypropylene molded by water-assisted and conventional injection molding
writer：Xianhu Liu, Guoqiang Zheng, Kun Dai, et al.
keywords：water-assisted injection molding; lamellar; orientation; polyethylene (PE); SAXS
source：期刊
specific source：Journal of Materials Science
Issue time：2011年
Journal of Materials Science，2011，46（24）：7830~7838
It is well known that water-assisted injection molding (WAIM) process can be fulfilled based on the melt filling stage of conventional injection molding (CIM) process. However, due to the different physical fields involved during WAIM and CIM processes, WAIM part should exhibit unique morphological features compared with the CIM one. In this study, isotactic polypropylene (iPP) parts were prepared by WAIM and CIM, respectively, and their comparative study on morphology were therefore carried out by means of polarized optical microscopy (POM) and two-dimensional (2D) wide-angle X-ray diffraction (WAXD). POM observations illustrated that the WAIM part exhibits a ‘‘skin–core–water channel’’ structure, while the CIM part shows a typical ‘‘skin–core’’