Spectroscopic characterization of a new type of conducting polymer-clay nanocomposite
Spectroscopic characterization of a new type of conducting polymer-clay nanocomposite
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DOI：
10.1021/ma025571l
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发表时间：
2002-09-24
期刊：
影响因子：
5.5
通讯作者：
Temperini, MLA
中科院分区：
文献类型：
--
作者：
do Nascimento, GM;Constantino, VRL;Temperini, MLA
导论.导电聚合物的导电性很大程度上取决于其链的排列。1，2改善聚合物本体性质的一种方法是将其限制在纳米级环境中。纳米复合材料是具有两种或更多种不同化合物的多相材料，它们以纳米方式组织，并且可以显示出单个相中不存在的电子，机械，磁性和光学特性，但这种协同作用的基本原因尚未完全理解。以无机主体结构和聚苯胺形成的3，4纳米复合材料是研究最多的体系之一。在这样的系统中，聚合物链通过无机结构合理地彼此隔离，为探索插入刚性基质中的单链的光谱性质提供了独特的机会。7 FTIR、EPR和其他技术已被大量用于表征这些复杂系统。在用于限制导电聚合物的无机主体中，经常使用粘土。5、6、8在文献中有几篇文章使用不同的合成策略在蒙脱土（一种天然粘土）9 r13的层之间制备聚苯胺，并且根据作者，然后形成聚苯胺的翠绿亚胺盐形式（ESr PANI）。到目前为止，拉曼光谱已经很少探索，以调查这些类型的杂化材料的性质。在这项工作中，我们提出了第一次的共振拉曼（RR）表征的聚合物粘土纳米复合材料形成的苯胺聚合在蒙脱石粘土Swy 2蒙脱石（MMT）的存在下，使用两种不同的合成路线在文献中报道。9，11这些路线之一导致ESrPANI，而另一种导致新型导电聚合物/粘土纳米复合材料。
Introduction. The conductivity of a conducting polymer depends strongly on the arrangement of its chains. 1, 2 One way to improve the bulk properties of a polymer is to confine it in nanoscale environments. Nanocomposites are multiphase materials with two or more different compounds organized in the nanometer regime and can show electronic, mechanical, magnetic, and optical properties that are not present in the individual phases, but the basic reason for this synergism is not yet completely understood. 3, 4 Nanocomposites formed with inorganic host structures and polyaniline have been one of the most studied systems. 5, 6 In such systems, the polymeric chains are reasonably isolated from one another by the inorganic structure, providing an unique opportunity to explore spectroscopic properties of single chains intercalated in a rigid matrix. 7 FTIR, EPR, and other techniques have been largely used to characterize these complex systems. 5r7 Among the inorganic hosts employed to confine conducting polymers, clays are frequently used. 5, 6, 8 There are several works in the literature using different synthetic strategies to prepare polyaniline between the layers of montmorillonite, a natural clay, 9r13 and according to the authors, the emeraldine salt form of polyaniline (ESr PANI) is then formed. Up to now, Raman spectroscopy has been little explored to investigate the nature of these types of hybrid materials. In this work, we present for the first time the resonance Raman (RR) characterization of a polymerrclay nanocomposite formed by the aniline polymerization in the presence of smectite clay Swy2 montmorillonite (MMT) using two different synthetic routes reported in the literature. 9, 11 One of these routes leads to ESrPANI while the other leads to a new type of conducting polymerrclay nanocomposite.