传统注射成型中流动诱导HDPE/UHMWPE共混物的取向结晶
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山东理工大学 材料科学与工程学院,山东 淄博 255100

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TQ325.1

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山东省自然科学基金资助项目(ZR2017BEM026,ZR2020QE075)


Flow Induced Orientation Crystallization in HDPE/UHMWPE Blends by Conventional Injection Molding
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    摘要:

    通过熔融共混将少量超高分子量聚乙烯(UHMWPE)引入到高密度聚乙烯(HDPE)中,并采用高温熔融和再次剪切对共混物进行处理后,使用传统注射成型方法进行成型。采用偏光显微镜(POM)、扫描电子显微镜(SEM)和二维小角X射线散射(2D-SAXS)对注射成型制品中晶体的形态结构进行了研究。发现传统注射成型(CIM)的流场可以诱导共混物形成明显的多层次晶体结构形态,在次表层存在大量的shish-kebab及互锁shish-kebab晶体结构,具有取向片晶结构的过渡层范围显著增大,而具有球晶结构的芯层范围明显缩小。表明在传统注射成型的流场下也能诱导形成丰富的取向片晶和shish-kebab结构,为注射成型制备自增强材料提供了一条新途径。

    Abstract:

    A small amount of ultra-high molecular weight polyethylene (UHMWPE) was mixed with high-density polyethylene (HDPE) by melt blending. The blends were treated by high-temperature melting and re-shearing, followed by being processed through the conventional injection molding method (CIM). And then the crystal morphology of CIM samples was characterized through polarized light microscopy (POM), scanning electron microscopy (SEM), and two-dimensional small angle X-ray scattering (2D-SAXS). It was found that the flow field in CIM induced the formation of multilayer crystal structures in blends obviously, and there was a large of shish-kebabs or interlocked shish-kebabs in the subsurface layer of CIM samples, and the range of transition layer with oriented lamellae increased significantly, while the range of core layer with spherulites decreased dramatically. These results show that abundant oriented lamellae and shish-kebabs can also be induced under the flow field in CIM, which may be a novel way for the preparation of self-reinforced materials by conventional injection molding.

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历史
  • 收稿日期:2022-05-13
  • 最后修改日期:2022-06-21
  • 录用日期:2022-07-21
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