成型方式对XLPE/OMMT纳米复合材料介电性能的影响  

Effect of molding method on dielectric properties ofXLPE/OMMT nanocomposites

作　　者：常锦涛 董瑞雪 李秀峰[1] 韩圣斌 李昊泽 马涛 CHANG Jintao;DONG Ruixue;LI Xiufeng;HAN Shengbin;LI Haoze;MA Tao(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Zibo Power Supply Company,Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]国网淄博供电公司,山东淄博255000

出　　处：《绝缘材料》2024年第3期42-49,共8页Insulating Materials

摘　　要：为了研究压制成型法和挤出成型法对纳米复合材料介电性能的影响,分别采用两种成型方式制备了交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合材料。探讨了不同复合材料中有机化蒙脱土的层间距变化对复合材料电阻-温度特性、介电常数和介质损耗以及电气强度的影响。结果表明:成型加工过程中的力场作用会影响OMMT的插层分散效果;挤出成型过程中的拉伸应力使试样中OMMT片层沿拉伸方向进行取向,形成了规整排列单元,载流子的迁移运动受到阻碍,从而改善了试样的电阻-温度特性;聚合物分子链段的运动受限于取向的片层间,使试样中偶极子的极化率降低,使得介电常数和介质损耗因数减小;同时,OMMT的有效插层与聚合物形成的杂化结构使电子产生漫反射现象,延长了电子运动路径,提高了挤出成型试样的电气强度。In order to study the effects of compression molding and extrusion molding on the dielectric properties of nanocomposites,these two molding methods were used to prepared the crosslinked polyethylene/organic montmorillonite(XLPE/OMMT)nanocomposites,respectively.The effects of the interlayer spacing change of OMMT in different composites on the resistance-temperature characteristics,dielectric constant,dielectric loss,and electric strength of the composites were discussed.The results show that the force field effect during the molding process can affect the intercalation dispersion effect of OMMT.The tensile stress during extrusion molding makes the OMMT sheets in the sample orient along the tensile direction,and form a regular arrangement unit,which hinders the migration of carriers,thereby improving the resistance-temperature characteristics of the sample.The movement of polymer molecular segments is limited between the oriented lamella,which makes the dipole in the sample decrease,and the dielectric constant and dielectric loss factor decrease.At the same time,the effective intercalation of OMMT and the hybrid structure formed by the polymer cause diffuse reflection of electrons,extending the electron motion path,and improving the electric strength of the extruded sample.

关 键 词：交联聚乙烯 蒙脱土 成型方式 微观结构 介电性能 

分 类 号：TM215[一般工业技术—材料科学与工程]