《Table 1 The main processing parameters of injection molding》

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《"Distribution of α-, β-, and γ-Phases in a Multi-flow Injection-molded Hierarchical Structure"》

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An MFVIM device，which can offer a periodic shear field，was developed to prepare i PP samples.Its schematic drawing and working principle have been described in our previous studies[41].Compared with that in our previous work，in the current experiment，vibration pressure was applied only one or two times，and the time interval between two vibrations was sufficiently long to form a spherulite layer.For convenience，the samples subjected to vibration pressure once and twice are designated as VIM I and VIM II，respectively.CIM was also used under similar thermal conditions to prepare samples for comparison.The main processing parameters are illustrated in Table 1.As shown in Fig.1，the sample has rectangular geometry with a dimension of 59，60 and 3 mm.The molding gate is in fan-shape with an end dimension of 59 and 5 mm.The thickness of gate is larger than that of cavity，so as to achieve relatively homogeneous flow.To investigate morphological evolution，the samples were divided into three zones along the flow direction.In addition，one half-width of each specimen was separated into eight layers along the thickness direction for X-ray measurements.