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《工程塑料应用》 2019年第12期
DOI:10.3969/j.issn.1001-3539.2019.12.010
PE-LD/PE-UHMW复合材料的制备工艺及拉伸性能
杜增锋,王旭,郑宏亮,汪东升
安徽工程大学纺织服装学院,安徽芜湖 241000 
Preparation Process and Tensile Properties of PE-LD/PE-UHMW Composites
Du Zengfeng, Wang Xu, Zheng Hongliang, Wang Dongsheng
College of Textile and Clothing, Anhui Polytechnic University, Wuhu 241000, China 
摘要:以低密度聚乙烯(PE-LD)薄膜为基体,超高分子量聚乙烯(PE-UHMW)纤维为增强体,采用热压成型的方法制备PE-LD/PE-UHMW复合材料层合板。在成型压力为2 MPa、保压时间为10 min的工艺条件下,研究了不同热压温度、不同纤维体积分数对复合材料拉伸性能的影响。采用差示扫描量热仪和X射线衍射仪对层合板进行了热分析和晶型转变表征。采用扫描电子显微镜对层合板的断裂处观察,分析复合材料的破坏机理。结果表明,在热压的过程中,由于PE-UHMW纤维熔融再结晶,形成了新的晶型。最佳的热压温度为140℃,在此条件下,随着纤维体积分数的增大,复合材料的拉伸强度呈现出先增大后减小的趋势,当PE-UHMW纤维体积分数为20%时达到最大,其值为(286.17±7.42) MPa,断裂伸长率为(8.84±0.86)%。在不损伤PE-UHMW纤维主体力学性能的前提下,纤维表面发生熔融,有利于纤维与基体之间界面结合力的增强,从而提高PE-LD/PE-UHMW复合材料的力学性能。 
Abstract:Ultra-high molecular weight polyethylene (PE-UHMW) fiber bundles were used as reinforcements and low-density polyethylene (PE-LD) films were used as matrix, PE-LD/PE-UHMW composite laminates were prepared by hot press forming. The effects of different hot pressing temperature and different fiber volume fraction on the tensile properties of the composites were studied under the conditions of molding pressure of 2 MPa and holding time of 10 min. The laminates were subjected to thermal analysis and crystal structure characterization using a differential scanning calorimeter and an X-ray diffractometer. The fracture mode of the fractured laminate was observed by scanning electron microscopy, and the failure mechanism of the composite was analyzed. The results show that, during the hot pressing process, a new crystal form is formed due to melt recrystallization of PE-UHMW fibers. The optimum hot pressing temperature is 140℃. At this temperature, with the increase of fiber volume fraction, the tensile strength of the composites increases at first and then decreases. When the fiber volume fraction is 20%, the maximum tensile strength is reached and is (286.17±7.42) MPa, the elongation at break is (8.84±0.86)%. On the premise of not damaging the mechanical properties of PE-UHMW fiber, the melting of PE-UHMW fiber surface is beneficial to the enhancement of the interfacial bonding force between the fiber and the matrix, the mechanical properties of PE-LD/PE-UHMW composites are improved. 
关键词:超高分子量聚乙烯;低密度聚乙烯;层合板;熔融结晶;破坏机理 
Keywords:ultra-high molecular weight polyethylene; low-density polyethylene; laminates; melting crystallization; failure mechanism 
基金:安徽工程大学国家自然科学基金预研基金项目(2015yy02),安徽省高校优秀青年骨干人才国内外访学研修项目(gxfx2017045),安徽工程大学科研启动基金项目(2012YQQ008) 
本文引用格式:
杜增锋,王旭,郑宏亮,等. PE-LD/PE-UHMW复合材料的制备工艺及拉伸性能[J].工程塑料应用,2019,47(12):56-60.
Du Zengfeng,Wang Xu,Zheng Hongliang,et al. Preparation process and tensile properties of PE-LD/PE-UHMW composites[J].Engineering Plastics Application,2019,47(12):56-60. 

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