Wei-Sheng Guan, Han-Xiong Huang and Bin Wang Poiseuille/squeeze flow-induced crystallization in microinjection-compression molded isotactic polypropylene Journal of Polymer Science Part B: Polymer Physics 51
Microinjection-compression molding (μ-ICM) is a promising technique for replicating microscale parts for various miniaturized systems. In this work, the isotactic polypropylene micropart with hierarchical crystalline morphology is prepared by μ-ICM, which involves intensive Poiseuille and squeeze flows occurring in the injection and compression stages, respectively. A close relationship is demonstrated between the shear/elongational strain rates and crystalline structure, based on which a useful route to manipulate the crystalline structure via varying the compression-related parameters is proposed.
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