低聚对位芳纶化学修饰多壁碳纳米管的制备及性能  

Preparation and Properties of Multiwalled Carbon Nanotubes Modified by Oligo(para-phenylene terephthanlamide)

作　　者：贾欣桦 曲荣君[1] 孙昌梅[1] 安凯 付饶 牟英蕾 Xin-hua Jia;Rong-jun Qu;Chang-mei Sun;Kai An;Rao Fu;Ying-lei Mu(Department of Chemistry and Material Science,Ludong University,Yantai 26402)

机构地区：[1]鲁东大学化学与材料科学学院,烟台264025

出　　处：《高分子学报》2018年第7期878-885,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号51673089;51373074)资助项目

摘　　要：为改善多壁碳纳米管的表面性能及分散性能,将低聚的氨基为端基的低分子量的对位芳纶(PPTA)与羧基碳纳米管(MWCNTs-COOH)反应,制备了低聚PPTA化学修饰的多壁碳纳米管PPTAMWCNTs-x,并对其结构进行了表征.研究结果表明,与MWCNTs-COOH相比,PPTA-MWCNTs-x在二甲基亚砜(DMSO)、氮甲基吡咯烷酮(NMP)、乙醇等有机溶剂中具有更好的稳定性和分散性,其稳定时间可分别长达216和240 h.本文以廉价的聚氯乙烯(PVC)为样板聚合物,采用浇铸法制备了碳纳米管/聚合物复合材料,比较了改性前后多壁碳纳米管对PVC薄膜力学性能的影响,并探讨了其增强机理.结果显示,与纯PVC薄膜相比,当PPTA-MWCNTs-x添加量为0.25 wt%时,可使PVC复合膜的杨氏模量和拉伸强度分别提高44.4%和79.4%;当PPTA-MWCNTs-x添加量为0.05 wt%时,可使PVC复合膜断裂应变提高203.6%.Carbon nanotubes have excellent mechanical properties. However, their application in polymer composites is limited due to their easy aggregation and inert surface. In order to improve their dispersion and surface performance, multiwalled carbon nanotubes（MWCNTs）, chemically modified using oligo（para-phenylene terephthanlamide） and denoted as PPTA-MWCNTs-x, were prepared, and used to investigate the reinforcement of the mechanical properties of poly（vinyl chloride）（PVC） composite films. PPTA-MWCNTs-x was obtained by the reaction of carboxymethyl multiwalled carbon nanotubes（MWCNTs-COOH） with amino-terminal para-phenylene terephthanlamide oligomers（PPTA）. A typical procedure is as follows： firstly, a desired amount of MWCNTsCOOH was suspended in N-methyl methyl pyrrolidone（NMP）, and the suspension was sonicated to form a homogenous dark-brown solution. In a separated experiment, amino-terminal PPTA oligomer was prepared by reacting PDA with TPC at a ratio of 1.5 to 1 in NMP. The above MWCNTs-COOH dispersion was poured into the PPTA solution just prepared, and the mixture was stirred at desired temperature for a given time in the presence of catalyst of N,N-dicyclohexylcarbodiimde under nitrogen atmosphere. The solid substance obtained was filtered and the product PPTA-MWCNTs-x was obtained. Transmission electron microscopy（TEM）, scanning electron microscope（SEM）, and Fourier transform infrared spectrometer（FTIR） were used to characterize the structure and the morphology of PPTA-MWCNTs-x. The results of FTIR analysis demonstrated that PPTA oligomers were successfully grafted on the surface of PPTA-MWCNTs-x. The dispersion stability of PPTA-MWCNTs-x in some solvents, such as NMP, dimethyl formamide（DMF）, dimethyl sulfoxide（DMSO） and ethanol, was investigated.The results showed that the stability of PPTA-MWCNTs-x in DMF and DMSO was higher than that in NMP and ethanol, and the time, that the dispersion remained stable without phase separation, could reach 216 and 240 h

关 键 词：多壁碳纳米管 低聚对苯二甲酰对苯二胺 化学修饰 PVC复合材料 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ127.11[化学工程—无机化工]