摘要
采用原子转移自由基聚合法(ATRP)合成了嵌段共聚物聚苯乙烯/苯乙烯基芘丁酸酯(PS-b-PAH),并将其对碳纳米管(MWNTs)进行非共价键表面修饰(PS-b-PAH/MWNTs),采用浇注成型法制备了MWNTs/环氧树脂(EP)纳米复合材料。透射电镜表明,嵌段聚合物PS-b-PAH包覆于MWNTs表面,形成有机包覆层的厚度为17.7nm。嵌段聚合物修饰有效地改善了碳纳米管在环氧基体中的分散性并提高了PS-b-PAH/MWNTs/EP纳米复合材料的导电性。当PS-b-PAH/MWNTs质量分数为0.8%时,复合材料的阈渗值pc=0.124%(质量分数),较MWNTs/EP(pc=0.625%)降低了5倍;电导率为10-3S/cm,较MWNTs/EP高了3～4个数量级。
The block copolymers of polystyrene-b-pyrene （PS-b-PAH） synthesized by atom transfer radical polymerization（ATRP） were used to noncovalently modify the surface of muhi-walled carbon nanotubes （MWNTs）. A homogeneous polymer layer was formed on the surface of MWNTs, and a wrapped copolymer layer with a thickness of about 17.7nm was found with TEM. The noncovalent modified MWNTs were dispersed very well in the epoxy（EP） resin, which were significantly helpful to improve the electrical conductivity of the epoxy composites. The percolation threshold of the PS-b-PAH/MWNTs/EP nano-composites is 0. 124%, while that of the non- modified MWNTs/EP composites is 0. 625 % , reaching a conductivity value of which is an increase of 3--4 orders of magnitude than that of the non-modified around 10-3 S/cm at 0.8 % loading, MWNTs/EP composites
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2012年第11期72-75,共4页
Polymer Materials Science & Engineering
基金
西北工业大学研究生创业种子基金(Z2012168)
关键词
多壁碳纳米管
苯乙烯基芘丁酸酯
嵌段共聚物
非共价修饰
介电性
muhiwalled carbon nanotubes
polystrene-b-pyrene
block-copolymer
noncovalent modification
electrical conductivity
