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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Intercalation and exfoliation relationships in melt-processed poly(styrene-co-acrylonitrile)/montmorillonite nanocomposites
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Intercalation and exfoliation relationships in melt-processed poly(styrene-co-acrylonitrile)/montmorillonite nanocomposites

机译：熔融加工的聚苯乙烯-丙烯腈/蒙脱土纳米复合材料的插层和剥落关系

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摘要

The effects of surfactant structure on the morphology and mechanical properties of melt processed mixtures of poly(styrene-co-acrylonitrile) (SAN) with montmorillonite (MMT) organoclays were examined. The composite which exhibited the greatest change in gallery height, the highest modulus, and greatest aspect ratio (similar to 50) was produced from an organoclay with the lowest molecular weight surfactant, dimethyl hydrogenated tallow ammonium. For ammonium ion surfactants with similar to 18 carbon hydrophobic tail(s), stack swelling, as measured by wide angle X-ray scattering (WAXS), was more strongly related to the reduced surfactant molecular weight than polarity or aromaticity of the head group substituents. A surfactant with a shorter tail length (similar to 12 vs. 18 carbon tail length) resulted in unswollen stacks in the composite.The swelling of the organoclay galleries seems to be explained by a balance of some favorable interactions of SAN with the montmorillonite platelet surface, versus repulsive mixing of aliphatic surfactant substituents with polar SAN. The repulsive nature of the latter increases as molecular weight of the head group substituents increases. A third factor is the platelet-platelet attraction that seems to explain the lack of swelling in the case of the shorter tail surfactant.Mechanical properties are also reported; and the composite moduli were found to compare to theoretical predictions using the Halpin-Tsai theory based on aspect ratios determined by transmission electron microscopy (TEM). The experimental aspect ratios do not seem to correlate with the WAXS gallery shifts. This and other evidence suggest that exfoliation in melt-processed SAN/MMT composites is not explained by intercalation behavior. (c) 2005 Published by Elsevier Ltd.
机译：考察了表面活性剂结构对聚苯乙烯-丙烯腈（SAN）与蒙脱石（MMT）有机粘土熔融加工混合物形态和力学性能的影响。由具有最低分子量的表面活性剂，二甲基氢化牛脂铵的有机粘土制得的复合材料具有最大的画廊高度变化，最高的模量和最大的长径比（类似于50）。对于具有类似于18个碳疏水尾的铵离子表面活性剂，通过广角X射线散射（WAXS）测量，烟囱膨胀与降低的表面活性剂分子量更密切相关，而不是与头基取代基的极性或芳香性相关。具有较短尾长的表面活性剂（类似于碳尾长12与18的碳长）导致复合材料中未溶胀的堆叠体.SAN与蒙脱土血小板表面的某些良好相互作用之间的平衡似乎可以解释有机粘土画廊的膨胀，而不是脂肪族表面活性剂取代基与极性SAN的排斥性混合。后者的排斥性随着头基取代基的分子量的增加而增加。第三个因素是血小板-血小板的吸引力，这似乎可以解释在使用短尾表面活性剂的情况下缺乏溶胀的作用。并根据基于透射电子显微镜（TEM）确定的纵横比，使用Halpin-Tsai理论将复合模量与理论预测值进行比较。实验的长宽比似乎与WAXS画廊的变化无关。该证据和其他证据表明，熔融加工的SAN / MMT复合材料中的剥落现象不能通过插层行为来解释。 （c）2005年由Elsevier Ltd.发布。

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