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通过自主设计的多流体多次注射成型装置研究二次剪切应力场和复杂温度场对高密度聚乙烯晶体形态发展的影响.用偏光显微镜(PLM)和扫描电子显微镜(SEM)分析了多流体多次注射成型(multi-fluidmulti-injection molding,MFMIM)和传统注射成型(conventional injection molding,CIM)高密度聚乙烯(HDPE)制品的结晶形态,发现CIM试样不论是皮层还是芯层主要形成的是普通球晶,而在MFMIM中,由于皮层熔体受到二次强剪切应力作用,形成了环带球晶和柱晶的特殊结构.在形态分析的基础上,初步探讨了聚合物多流体多次注射成型制品结晶形态的形成机理.
The effect of secondary shearing stress field and complex temperature field on the morphology of high-density polyethylene (HDPE) crystals was investigated by a self-designed multi-fluid multi-shot injection molding device.The effects of multi-fluid The crystalline morphology of multi-fluid multi-injection molding (MFMIM) and conventional injection molding (CIM) high density polyethylene (HDPE) products was found to be mainly formed by cortical or core layers Is a common spherulite, while in the MFMIM, the special structure of the ring-ring spherulites and the columnar crystals is formed due to the second strong shear stress on the cortical melt. Based on the morphological analysis, the polymer multi-fluid Formation Mechanism of Crystallographic Form of Multiple Injection Molded Products.