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首页> 外文期刊>Materials Science and Engineering >Structure and dynamics in polymer/layered silicate nanocomposites
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Structure and dynamics in polymer/layered silicate nanocomposites

机译：聚合物/层状硅酸盐纳米复合材料的结构和动力学

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摘要

A poly(methyl phenyl siloxane) homopolymer is intercalated within the organophilized galleries of layered silicates forming nanocomposites in which the polymer chains are confined within the ～1.5nm interlayer spacing. These are found to be equilibrium structures since they are independent of the preparation method whereas the spacing is independent of the hybrid composition as well. Quasielastic neutron scattering investigated the effect of such severe confinement on polymer dynamics. Two relaxation processes corresponding to the methyl group rotation and the polymer segmental relaxation were clearly identified for both the bulk homopolymer and the nanocomposite. The very local process of methyl group rotation was unaffected by the confinement within the silicate galleries. At temperatures above the polymer glass transition temperature, the quasielastic data reveal a strong coupling between the segmental motion and the motion of the surfactant chains of the organosilicate. However, the mean square displacement data show that the segmental process in confinement is actually faster than that of the bulk polymer even when the contribution of the surfactant chains is taken into account.
机译：聚（甲基苯基硅氧烷）均聚物插入层状硅酸盐的亲有机化通道中，形成纳米复合材料，其中聚合物链限制在约1.5nm的层间间距内。发现它们是平衡结构，因为它们独立于制备方法，而间距也独立于杂化组合物。准弹性中子散射研究了这种严格限制对聚合物动力学的影响。对于本体均聚物和纳米复合材料均清楚地确定了对应于甲基旋转和聚合物链段松弛的两个松弛过程。甲基旋转的非常局部的过程不受硅酸盐通道内的限制的影响。在高于聚合物玻璃化转变温度的温度下，准弹性数据揭示了分段运动与有机硅酸盐的表面活性剂链的运动之间的强耦合。但是，均方位移数据表明，即使考虑到表面活性剂链的贡献，封闭过程中的分段过程实际上比本体聚合物快。

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  • 来源
    《Materials Science and Engineering》 |2008年第3期|33-39|共7页
  • 作者

    S.H. Anastasiadis; K. Chrissopoulou; B. Frick;

  • 作者单位

    Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P. 0. Box 1527, 71110 Heraklion, Crete, Greece Aristotle University of Thessaloniki, Department of Chemical Engineering, 54124 Thessaloniki, Greece;

    Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, P. 0. Box 1527, 71110 Heraklion, Crete, Greece;

    Institut Laue Langenvin, 6 rue Jules Horowitz, F38042 Grenoble, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    layered silicates; nanocomposites; intercalation; dynamics in confinement;

    机译：层状硅酸盐;纳米复合材料插层禁闭动力学;

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