以高密度聚乙烯(HDPE)为基体,改性的石墨烯为导电填料,采用熔融法制备正温度系数(PTC)的改性石墨烯/高密度聚乙烯复合材料。通过扫描电子显微镜、热重测试仪以及拉伸测试仪等,观察改性石墨烯/高密度聚乙烯复合材的微观形貌,研究改性石墨烯含量对复合材料热稳定性的影响以及拉伸性能的影响。结果表明:石墨烯在HDPE基体中分散性较好,在室温电阻率同为18.5Ω·㎝条件下,改性前复合材料耐电压冲击为250V,改性后复合材料耐电压冲击为400V,改性后的石墨烯加入HDPE,能够明显地提高复合材料增强耐电压性能,在石墨烯用量同为8.0%(体积百分数)条件下,改性前石墨烯的复合材料拉伸强度为25.6MPa,改性后石墨烯的复合材料拉伸强度为27.7MPa,改性后的石墨烯加入HDPE,能够明显提高复合材料的拉伸强度。
The modified graphene/HDPE PTC composites were prepared by melt-mixing method using high-density polyethylene (HDPE) and modified graphene as the filler.Scanning electron microscope (SEM),thermogravimeter and tensile tester were used to observe the microstructure of the composites,and studied the influence of modified graphene content on the thermal stability and tensile properties.Results revealed that the graphene had good dispersity in the HDPE matrix.When the room temperature resistivity was the same as 18.5Ω·㎝,the composite before the graphene modification had a withstand voltage of 250V,and the modified composite had a withstand voltage of 400V.The modified graphene was added to HDPE,and the composite's enhanced withstand voltage performance was significantly improved.When the graphene content was 8.0vol%,the tensile strength of the composite before the graphene modification was 25.6MPa,and the tensile strength of the modified composite was 27.7MPa.When the modified graphene was added to HDPE,the tensile strength of the composite was significantly improved.
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基金资助
国家自然科学基金资助项目(51607109);上海市自然科学基金(16ZR1412400,15ZR1417100);上海市科委科普项目(16DZ2348700);上海第二工业大学重点学科(XXKYS1601);上海第二工业大学研究生项目基金(A01GY17F022)
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