Synthesis and characterization of polyaniline–organoclay nanocomposites
Synthesis and characterization of polyaniline–organoclay nanocomposites
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DOI：
10.1002/app.27180
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发表时间：
2008-02
影响因子：
3
通讯作者：
N. Salahuddin;M. Ayad;M. Ali
中科院分区：
文献类型：
--
作者：
N. Salahuddin;M. Ayad;M. Ali
制备了聚苯胺（PANI）-有机粘土纳米复合材料。苯胺单体插层到蒙脱土（MMT）改性，然后在层间距苯胺的后续氧化聚合。通过蒙脱土中的钠离子与四种不同分子量的乙二胺和三胺中的鎓离子进行阳离子交换，制备了有机粘土。红外光谱证实了带正电荷的鎓基团（NH 3+）和带负电荷的MMT表面之间的静电相互作用。X射线衍射分析提供了结构信息。在某些类型和含量的有机粘土下，纳米复合材料中没有d 001衍射带。采用扫描电子显微镜和透射电子显微镜测定粘土在聚苯胺中的分散性。采用热重分析法研究了聚苯胺在纳米复合材料中的热降解行为。重量损失表明纳米复合材料中的PANI链比原始PANI更热稳定。这种改善是由于高纵横比的纳米层作为屏障的存在下，从而屏蔽从纳米复合材料的降解聚苯胺的扩散。在一定浓度下，复合材料的电导率比纯蒙脱土提高了30倍以上。© 2007 Wiley Periodicals，Inc.应用聚合物科学杂志，2008年
Polyaniline (PANI)–organoclay nanocomposites were prepared. Intercalation of aniline monomer into montmorillonite (MMT) modified by polyoxyalkylene was followed by subsequent oxidative polymerization of the aniline in the interlayer spacing. The organoclay was prepared by cation exchange process between sodium cation in MMT and onium ion in four different types of polyoxyalkylene diamine and triamine with different molecular weight. Infrared spectra confirm the electrostatic interaction between the positively charged onium group (NH3+) and the negatively charged surface of MMT. X-ray diffraction analysis provides a structural information. The absence of d001 diffraction band in the nanocomposites was observed at certain types and contents of organoclay. Scanning electron microscopy and transmission electron microscopy were employed to determine the dispersion of the clay into PANI. The thermal degradation behavior of PANI in the nanocomposites has been investigated by thermogravimetric analysis. The weight loss suggests that the PANI chains in the nanocomposites are more thermally stable than pristine PANI. This improvement is attributed to the presence of nanolayers with high aspect ratio acting as barriers, thus shielding the diffusion of degraded PANI from the nanocomposites. The electrical conductivity of the nanocomposites was increased 30 times more than that of pure MMT at a certain concentration. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008