Functionalization of multiwalled carbon nanotubes with polyamide 6 by anionic ring-opening polymerization
Functionalization of multiwalled carbon nanotubes with polyamide 6 by anionic ring-opening polymerization
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DOI：
10.1016/j.carbon.2007.07.021
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发表时间：
2007-10
期刊：
影响因子：
10.9
通讯作者：
Mei Yang;Yong Gao;Hua-ming Li;A. Adronov
中科院分区：
文献类型：
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作者：
Mei Yang;Yong Gao;Hua-ming Li;A. Adronov
以己内酰胺钠为催化剂，己内酰胺官能化的多壁碳纳米管（MWCNTs）为引发剂，通过己内酰胺的阴离子开环聚合，实现了MWCNTs与聚酰胺6的共价官能化。引发剂前体，异氰酸酯官能化的多壁碳纳米管，通过直接反应的商业羟基官能化的多壁碳纳米管与过量的甲苯2，4-二异氰酸酯制备。发现这种阴离子开环聚合在相对低的反应温度（170°C）和短的反应时间（6 h）下以高效的方式发生。利用FTIR光谱跟踪MWCNTs上异氰酸酯基团的引入和消耗。热重分析表明，聚酰胺6成功地从MWCNT表面生长，最终产物的聚合物重量百分比为约10%。40- 65重量%。利用透射电子显微镜对聚合物官能化的多壁碳纳米管进行成像，显示出在多壁碳纳米管表面上呈现的相对均匀的聚合物涂层。
Covalent functionalization of multiwalled carbon nanotubes (MWCNTs) with polyamide 6 was accomplished by anionic ring-opening polymerization of ε-caprolactam in the presence of sodium caprolactamate as a catalyst and caprolactam functionalized MWCNTs as an initiator. The initiator precursor, isocyanate functionalized MWCNTs, was prepared by directly reacting commercial hydroxyl functionalized MWCNTs with excess toluene 2,4-diisocyanate. This anionic ring-opening polymerization was found to occur in a highly efficient manner at relatively low reaction temperature (170°C) and short reaction times (6h). FTIR spectroscopy was utilized to follow the introduction and consumption of isocyanate groups on the MWCNTs. Thermogravimetric analysis indicated that the polyamide 6 was successfully grown from the MWCNT surface, with the final products having a polymer weight percentage of ca. 40–65wt%. Transmission electron microscopy was utilized to image the polymer-functionalized MWCNTs, showing relatively uniform polymer coatings presented on the surface of MWCNTs.