Preparation of electro conductive nano-composite from surface modified carbon nanotube and their application to sensing material

表面改性碳纳米管导电纳米复合材料的制备及其在传感材料中的应用

基本信息

批准号：
15360357
负责人：
TSUBOKAWA Norio
金额：
$ 8.9万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

1.The grafting of polymers onto carbon nanotube (CNT) and vapor grown carbon fiver (VGCF) by ligand-exchange reaction of polymers containing ferrocene moieties with aromatic ring of these surfaces was successfully achieved in the presence of Al powder and AlCl_3 as catalyst. The percentage of grafting (wt% of grafted polymer to CNT) reached to 60.9%. It was also found that the percentage of poly(vinyl ferrocene-co-methyl methacrylate) grafting increased with increasing vinyl ferrocene content of the copolymer. The copolymer was also grafted onto VGCF and carbon micro coil surface by use of the ligand-exchange reaction.2.The introduction of carboxyl groups onto CNT and VGCF surface was successfully achieved by the ligand-exchange reaction of polycondensed aromatic rings of these surfaces with 1,1'-dicarboxyferrocene. The grafting of hydroxyl and amino group terminated polymers, such as poly(ethylene glycol) (PEG) and poly(ethylene adipate), onto CNT surface was achieved by direct conden … More sation of carboxyl groups of CNT and VGCF with terminal hydroxyl groups of these polymers in the presence of N,N'-dicyclohexylcarbodiimide.3.The introduction of peroxyester groups onto CNT by the trapping of radicals having peoxyester moieties which were formed by the thermal decomposition of Perhexa C in toluene at 70℃ for 10 h was examined. As a result, peroxyester groups were successfully introduced onto CNT surface. The amount of peroxy groups introduced onto CNT was determined to be 9.5 mmol/g by titration. It was found that the radical graft polymerization of vinyl monomers was successfully initiated by the peroxyester groups introduced onto the CNT surface at 100℃ to give the corresponding polymer-grafted CNT. The percentage of grafting of ptoly(methyl methacrylate) reached to 6.6%.4.Poly(vinyl ferrocene-co-methyl methacrylate)-grafted CNT gave a stable dispersion in good solvent for grafted polymer, such as THF. The precipitation of the polymer-grafted CNT was scarcely observed even after 4 weeks. In addition, polymer-grafted VGCF and CNT readily and uniformly dispersed in grafted polymers to give nano-composites.It was found that electric resistance of the composites prepared from PEG-grafted VGCF and CNT drastically increased at melting point of PEG, 50℃. Therefore, the composites from PEG-grafted VGCF and CNT show positive temperature coefficient (PTC) characteristic.The electric resistance of the composites prepared from polymer-grafted VGCF and CNT suddenly increased in organic solvent vapor, such as methanol, THF, and toluene, and returns immediately to initial resistance when the composite was transferred in dry air. The responsiveness of electric resistance was reproducible even after 20 cycles of exposure to methanol vapor and dry air. Less

1。在含有这些表面的芳族环的聚合物的配体转换反应中，聚合物将聚合物嫁接到碳纳米管（CNT）和蒸气生长的碳卵（VGCF）中，这些反应在Al Powder和Alcl_3的情况下成功地实现了这些表面的芳香环。嫁接百分比（嫁接聚合物至CNT）的百分比达到60.9％。还发现，随着共聚物的乙烯基苯基苯基含量的增加，聚（乙烯基二苯基甲基甲基甲基甲基甲基甲基）的百分比增加。还通过使用配体交换反应将共聚物分级到VGCF和碳微型线圈表面上。2。将羧基引入CNT和VGCF表面通过这些表面与1,1'-二甲酰基辅助剂的配体芳族环的配体交换反应成功实现了CNT和VGCF表面。羟基和氨基群的嫁接终止聚合物，例如聚（乙二醇）（PEG）和聚（乙二醇），通过直接凝结物来实现CNT表面…在n'，N's-dycycro的存在下的CNT和VGCF羧基的羧基和VGCF的羧基中，更多的CNT和VGCF的羧基群。过氧化物组通过捕获具有粘液酯部分的自由基在甲苯中的甲苯中的热分解而在70℃中进行10 h形成。结果，过氧化物组成功地引入了CNT表面。通过滴定，引入CNT上的过氧酯组的量确定为9.5 mmol/g。发现乙烯基单体的自由基移植聚合是由在100℃处引入CNT表面的过氧化酯组成功引发的，从而得到相应的聚合物接枝CNT。替托（甲基丙烯酸甲酯）的嫁接百分比达到6.6％.4。poly（乙烯基二苯基二甲基甲基丙烯酸甲酯）嫁接的CNT具有稳定的溶液中，用于接枝聚合物，例如THF。即使在4周后，几乎观察到聚合物接枝CNT的沉淀。此外，聚合物接枝的VGCF和CNT易于分散在移植聚合物中以获得纳米复合材料。它发现在PEG接收的VGCF和CNT在PEG的熔点下，由PEG接触的VGCF和CNT急剧增加了复合材料的电阻。因此，来自PEG植根的VGCF和CNT的组成显示了正温系数（PTC）的特征。由聚合物接枝的VGCF和CNT制备的电阻突然在有机溶剂蒸气中突然增加，例如甲醇，THF，THF，THF和甲苯和甲苯，并立即返回到最初的抵抗力，并在最初的抵抗力中转移到最初的抗材料中，当时是Drys Redred in Dry Reals Rys Reds Rys Reds Reds Rys Reds Reds Reds Reds Reds Red。即使在20个周期暴露于甲醇蒸气和干燥空气中，电阻的反应也可以重现。较少的