Characteristics of LDPE and Oriented Montmorillonite Nanocomposites Produced by Electric Field-inducement  

Characteristics of LDPE and Oriented Montmorillonite Nanocomposites Produced by Electric Field-inducemenl

作　　者：BAI Ge LIAO Ruijin YANG Lijun YUAN Yuan GU Jia 

机构地区：[1]State Key Laboratory of Transmission & Distribution Equipments and Power System Safety and New Technology, Chongqing University, Chongqing 400030, China

出　　处：《高电压技术》2013年第8期1947-1951,共5页High Voltage Engineering

基　　金：Project supported by National Natural Science Foundation of China （50807054）.

摘　　要：In order to make montmorillonite (MMT) nanosheets disperse in low-density polyethylene (LDPE) with highly homogeneous orientation, alternating voltage is applied to molten LDPE with MMT nanosheets. The effect of electric field on the dispersion of MMT in the solidified LDPE is studied. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses suggest that the MMT nano- sheets are aligned with high anisotropy to the electric field direction, which is perpendicular to the LDPE film plane. Differential scanning calorimetry (DSC) results reveal that the crystallization degree of the oriented LDPE/MMT composite increases. Moreover, through a broadband dielectric spectroscopy analyzer, it is found that MMT manifests a significantly influence in the dielectric property of the oriented composite: the dielectric constant and loss tangent of the composite both become larger. Analysis shows that the electric field-induced torque caused by the polarization of MMT flakes is the main force inducing the orientation of the MMT flakes.In order to make montmorillonite （MMT） nanosheets disperse in low-density polyethylene （LDPE） with highly homogeneous orientation, alternating voltage is applied to molten LDPE with MMT nanosheets. The effect of electric field on the dispersion of MMT in the solidified LDPE is studied. X-ray diffraction （XRD） and scanning electron microscopy （SEM） analyses suggest that the MMT nano- sheets are aligned with high anisotropy to the electric field direction, which is perpendicular to the LDPE film plane. Differential scanning calorimetry （DSC） results reveal that the crystallization degree of the oriented LDPE/MMT composite increases. Moreover, through a broadband dielectric spectroscopy analyzer, it is found that MMT manifests a significantly influence in the dielectric property of the oriented composite： the dielectric constant and loss tangent of the composite both become larger. Analysis shows that the electric field-induced torque caused by the polarization of MMT flakes is the main force inducing the orientation of the MMT flakes.

关 键 词：纳米复合材料 LDPE薄膜 电场方向 介电特性 蒙脱土 低密度聚乙烯 扫描电子显微镜 差示扫描量热法 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]