多壁碳纳米管填充聚偏氟乙烯复合薄膜的介电性能  

Dielectric Properties of PVDF Based Composites Filled by Triethylene Tetramine Modified Multiwalled Carbon Nanotubes

作　　者：李淑琴[1] 王经文[1] 王晔[1] 王芳[1] 肖军[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《南京航空航天大学学报》2008年第1期115-119,共5页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：江苏省自然科学基金(BK2006194)资助项目

摘　　要：为提高多壁碳纳米管(Multiwalled carbon nanotubes,MWCNTs)与聚偏氟乙烯(PVDF)复合的相容性,对MWCNTs进行了三乙烯四胺(Triethylene tetramine,TETA)改性,FTIR表征证明了改性的成功;采用溶液浇铸法制备了改性前后的MWCNTS/PVDF复合薄膜,并测试分析了其介电性能。结果表明TETA-MWCNTs/PVDF复合薄膜的介电性能符合逾渗理论。当MWCNTs的体积分数为0.048时,100 Hz下TETA-MWCNTs/PVDF的介电常数高达3 209,是未改性多壁碳纳米管(U-MWCNTs)/PVDF复合材料介电常数的两倍。SEM分析表明,与U-MWCNT相比,TETA-MWCNTs能更好地分散在基体中,与PVDF之间的界面结合力更强,并可形成更加致密的逾渗网络。Multiwalled carbon nanotubes （MWCNTs） are modified by triethylene tetramine （TETA） to improve the compatibility between MWCNTs and PVDF. The success of modification is confirmed by FTIR. PVDF based composites filled by TETA-MWCNTs and unmodified multiwalled carbon nanotubes （U-MWCNTs） are fabricated by the solution cast method. The dielectric properties of the composites are measured and analyzed. The dielectric properties of TETA-MWCNTs/PVDF composites obey the percolation theory. The dielectric constant of TETA-MWCNTs/PVDF composites can reach 3 209 at 100 Hz, nearly two times larger than that of U-MWCNTs/PVDF composites when the volume fraction of filler is 0. 048. SEM morphologies for the fractured surface of composites confirm that TETA-MWCNTs can disperse more uniformly in PVDF with a tighter interracial bonding with PVDF ma- trix. The result proves that TETA-MWCNTs can form compact continuous percolation networks.

关 键 词：复合材料 多壁碳纳米管 三乙烯四胺 介电常数 

分 类 号：TN957.51[电子电信—信号与信息处理] TN959.73[电子电信—信息与通信工程]