Zhang Junwen, Zhang Yiwei, Li Yanjiang, Luo Mengna, Zhang Jie
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2024 Apr 10;16(8):1032. doi: 10.3390/polym16081032.
As one of the most widely applied general-purpose plastics, high-density polyethylene (HDPE) exhibits good comprehensive performance. However, mechanical strength limits its wider application. In this work, we introduced the engineering plastic PA6 as a dispersed phase to modify the HDPE matrix and applied multiple shears generated by vibration to the polymer melt during the packing stage of injection molding. SEM, 2D-WXRD and 2D-SAXS were used to characterize the morphology and structure of the samples. The results show that under the effect of a strong shear field, the dispersed phase in the composites can form in situ microfibers and numerous high-strength shish-kebab and hybrid shish-kebab structures are formed. Additionally, the distribution of fibers and high-strength oriented structures in the composites expands to the core region with the increase in vibration times. As a result, the tensile strength, tensile modulus and surface hardness of VIM-6 can reach a high level of 66.5 MPa, 981.4 MPa and 72, respectively. Therefore, a high-performance HDPE product is successfully prepared in this study, which is of great importance for expanding the application range of HDPE products.
作为应用最广泛的通用塑料之一，高密度聚乙烯（HDPE）具有良好的综合性能。然而，机械强度限制了其更广泛的应用。在本工作中，我们引入工程塑料PA6作为分散相来改性HDPE基体，并在注塑成型的保压阶段对聚合物熔体施加由振动产生的多重剪切作用。采用扫描电子显微镜（SEM）、二维广角X射线衍射（2D-WXRD）和二维小角X射线散射（2D-SAXS）对样品的形态和结构进行表征。结果表明，在强剪切场作用下，复合材料中的分散相可形成原位微纤维，并形成大量高强度的串晶和混合串晶结构。此外，随着振动次数的增加，复合材料中纤维和高强度取向结构的分布扩展至芯部区域。结果，振动注塑成型6次（VIM-6）的样品的拉伸强度、拉伸模量和表面硬度分别可达到66.5 MPa、981.4 MPa和72的高水平。因此，本研究成功制备了高性能HDPE产品，这对于扩大HDPE产品的应用范围具有重要意义。
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