PE-HD/GNP/MWCNT纳米复合材料性能

Properties of PE-HD/GNP/MWCNT Nanocomposites

采用熔融共混法制备了高密度聚乙烯(PE-HD)/石墨烯纳米片(GNP)/多壁碳纳米管(MWCNT)纳米复合材料。研究了GNP/MWCNT比例对PE-HD/GNP/MWCNT纳米复合材料流变特性、电学及力学性能的影响。结果表明,3种PE-HD/GNP/MWCNT纳米复合材料的储能模量曲线均在低频区出现“第二平台”。MWCNT含量增大有利于提高纳米复合材料的导电性,GNP/MWCNT比例为2/8时,复合材料呈现出更低的体积电阻率。当GNP+MWCNT含量为0.5份、GNP/MWCNT比例分别为7/3,5/5,2/8时,PE-HD/GNP/MWCNT纳米复合材料悬臂梁缺口冲击强度均呈现最大值,分别为15.05,9.98,10.42 kJ/m2,是纯PE-HD的2.32,1.54,1.60倍。纳米复合材料冲击韧性提高的根本原因在于GNP和MWCNT协同诱发PE-HD基体产生明显的屈服。GNP/MWCNT填料的加入可使3种纳米复合材料的拉伸强度和弯曲强度有所提高。

High density polyethylene(PE-HD)/graphene nanoplatelets(GNP)/multi-walled carbon nanotube(MWCNT)nanocomposites were prepared through melt blending.The effects of GNP/MWCNT ratios on the rheological,electrical and mechanical properties of PE-HD/GNP/MWCNT nanocomposites were investigated.The results show that the storage modulus curves of PE-HD/GNP/MWCNT nanocomposites exhibit“second plateau”in the low frequency region.The electrical conductivities of three nanocomposites are greatly improved with the increase of MWCNT content.When the GNP/MWCNT ratio is 2/8,the composites exhibit lower volume resistivity.When the MWCNT+GNP content is 0.5 phr,the MWCNT/GNP ratios are 7/3,5/5,2/8,the Izod notched impact strength of three composites reaches maxima of 15.05,9.98,10.42 kJ/m2,are 2.32,1.54 and 1.60 times as high as PE-HD matrix,respectively.The synergistic effects of MWCNT and GNP fillers induce PE-HD matrix yield significantly,which is the main reason for the high toughness of nanocomposites.The addition of MWCNT/GNP fillers improves the tensile and flexural strength of PE-HD/GNP/MWCNT nanocomposites.