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首页> 外文期刊>Journal of Applied Polymer Science >PMMA/o-MMT Nanocomposites Obtained Using Thermally Stable Surfactants
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PMMA/o-MMT Nanocomposites Obtained Using Thermally Stable Surfactants

机译：使用热稳定的表面活性剂获得的PMMA / o-MMT纳米复合材料

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In the preparation of polymer/montmorillonite (MMT) nanocomposites, the commonly used compatibilizers (cations of long carbon-chain alkyl ammonium salts) present the drawback of a poor thermal stability. During bulk processing of nanocomposites elevated temperatures are usually required and, if processing temperature is close to decomposition temperature of the surfactant, decomposition will occur altering the interface between filler and polymer. To solve this problem, organically modified MMTs with thermally stable imidazolium surfactants have been prepared. A series of nanocomposites were obtained by dispersing o-MMT in poly(methyl methacryate) (PMMA) matrix via an in situ free radical polymerization. The nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, gel permeation chromatography, thermogravimetric analysis, dynamic mechanical analysis, and nanoindentation measurements. The results showed that nanocomposite thermal stability depended on both the kind of used surfactant and degree of exfoliation. Under the same values of molecular weight, the nanocomposites containing imidazolium cations showed a better thermal stability with respect to the nanocomposite obtained using a standard alkylammonium surfactant. Dynamic mechanical and Nanoindentation measurements showed an improvement of mechanical properties, such as modulus and hardness, with respect to pure PMMA. Solution blending treatments on these nanocomposites led to obtaining of further improvement of the thermal performance. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41393.
机译：在聚合物/蒙脱土（MMT）纳米复合材料的制备中，常用的相容剂（长碳链烷基铵盐的阳离子）具有热稳定性差的缺点。在纳米复合材料的批量加工期间，通常需要升高的温度，如果加工温度接近表面活性剂的分解温度，则分解将发生，从而改变了填料与聚合物之间的界面。为了解决该问题，已经制备了具有热稳定的咪唑鎓表面活性剂的有机改性的MMT。通过原位自由基聚合将o-MMT分散在聚甲基丙烯酸甲酯（PMMA）基质中，获得了一系列纳米复合材料。通过X射线衍射，透射电子显微镜，凝胶渗透色谱，热重分析，动态力学分析和纳米压痕测量来表征纳米复合材料。结果表明，纳米复合材料的热稳定性取决于所用表面活性剂的种类和剥落程度。在相同的分子量值下，相对于使用标准烷基铵表面活性剂获得的纳米复合材料，含咪唑鎓阳离子的纳米复合材料表现出更好的热稳定性。动态机械和纳米压痕测量显示出相对于纯PMMA的机械性能有所改善，例如模量和硬度。在这些纳米复合材料上的溶液共混处理导致热性能的进一步提高。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41393。

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