OALib Journal期刊
基于CH-π相互作用的多壁碳纳米管表面POSS粒子非共价修饰研究
DOI: 10.11777/j.issn1000-3304.2015.14311
Keywords: 超支化聚乙烯 ,多面体低聚倍半硅氧烷 ,共聚物 ,多壁碳纳米管 ,非共价修饰 ,CH-π作用
Abstract:
首先以α-二亚胺钯(Pd-diimine)在0.1MPa/35℃下催化乙烯和多面体低聚倍半硅氧烷(POSS)共聚,基于链"行走"机理以一步法工艺获得含有多重POSS的超支化聚乙烯共聚物(HBPE@POSS),随后分别以THF和氯仿为溶剂,在超声下利用所得HBPE@POSS对多壁碳纳米管(MWCNTs)进行表面改性.分别运用核磁共振波谱(1H-NMR)、凝胶渗透色谱(GPC)、广角X射线衍射(WAXD)和热重分析(TGA)技术对所得HBPE@POSS的结构与组成进行了表征,进一步通过紫外-可见吸收光谱(UV-Vis)、透射电子显微镜(TEM)、WAXD、傅立叶红外光谱(FTIR)和TGA技术对MWCNTs的分散浓度、形貌、聚集状态及与聚合物间的非共价作用进行了考察.结果表明,已将POSS引入超支化聚乙烯(HBPE)结构中,比例达39.0wt%;借助超声,所得HBPE@POSS可实现MWCNTs在THF/氯仿中单根稳定分散,最高浓度达987mg/L(THF)和511mg/L(氯仿);利用非共价CH-π作用,可将一定比例的POSS粒子稳固地引入MWCNTs表面.基于该思路,可望在CNTs表面引入更多种类的功能无机纳米粒子,为其表面非共价无机功能化修饰提供新的方法.
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