[C_(16)min]Br修饰的多壁碳纳米管及其与低密度聚乙烯复合材料的制备及介电性能  

Preparation and Dielectric Properties of Polyethylene Based Composites Filled with Ionic Liquid-Functionalized MWNT

作　　者：徐佩[1,2] 卢旭鑫[1] 汪传斌 杨善中[1] 孙晓红[1] 丁运生[1] 

机构地区：[1]合肥工业大学化工学院,安徽合肥230009 [2]远东电缆有限公司,江苏无锡214257

出　　处：《高分子材料科学与工程》2013年第12期160-163,共4页Polymer Materials Science & Engineering

基　　金：安徽省自然科学基金资助项目(1308085QB40);中央高校基本科研业务费专项资金(2013HGQC0016;2011HGBZ1323)

摘　　要：为改善多壁碳纳米管(MWNT)在低密度聚乙烯(LDPE)中的分散性及复合材料的界面特性,采用溴化-1-十六烷基-3-甲基咪唑基离子液体([C16min]Br)对MWNT进行表面改性,并用Raman光谱对改性效果进行了表征。将经过修饰的碳纳米管(MIL)与LDPE熔融共混得到MIL/LDPE复合材料,采用场发射扫描电子显微镜(FESEM)和阻抗分析仪(LCR)对复合材料的结构与介电性能进行了分析。结果表明,相比与MWNT/LDPE(渗流阈值为5.2%,介电常数为82,介电损耗为0.93),MIL/LDPE(渗流阈值为9.1%,介电常数为169,介电损耗为0.51)介电常数增大,介电损耗降低。并且在低温时,MIL/LDPE介电常数随温度的变化甚小,显示出良好的温度-介电常数特性。Multiwalled carbon nanotubes （MWNT） were modified by imidazolium ionic liquid （IL） to improve the dispersibility of MWNT and the interphase property between MWNT and LDPE. The physical cation-n interaction between the IL and the MWNT was evidenced by Raman spectroscopy. LDPE based composites filled with IL- functionalizedMWNT （MIL） and MWNT were fabricated by the melt mixing and hot pressing method. The structure and dielectric properties of the composites were measured and analyzed. Compared with MWNT/LDPE composites, the MIL/LDPE composites exhibit a lower loss tangent and a higher dielectric permittivity. The interphase between MIL and LDPE is in charge of the improvement of dielectric permittivity, and the nonconducting organic segment of the IL supports the low loss tangent in the MIL/LDPE composites. The temperature dependence of complex permittivity is minimal in the MIL/LDPE composites at low temperature.

关 键 词：咪唑基离子液体 碳纳米管 低密度聚乙烯 介电性能 

分 类 号：TB332[一般工业技术—材料科学与工程]