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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Main dielectric relaxation of poly(methyl acrylate)-polystyrene interpenetrating polymer networks
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Main dielectric relaxation of poly(methyl acrylate)-polystyrene interpenetrating polymer networks

机译：聚（丙烯酸甲酯）-聚苯乙烯互穿聚合物网络的主介电弛豫

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摘要

Two series of poly(methyl acrylate)-polystyrene sequential interpenetrating polymer networks were prepared by free radical polymerization using ethyleneglycol dimethacrylate as cross-linking agent. In one of them the cross-linking density was very low and the IPNs presented phase separation. The main dielectric relaxation appears in the IPNs in the same position in the frequency axis and almost with the same shape as in the pure PMA network. Nevertheless the ratio of the relaxation strength to the weight fraction of PMA in the IPN decreases slightly with the increase of polystyrene content. The other series of IPNs were highly crosslinked, in these IPNs a dielectric relaxation still appears almost at the same temperature as in pure PMA network but it changes in its shape and an important decrease of the normalized relaxation strength is shown. The main relaxation ascribed to a polystyrene rich phase can also be observed due to the polarity of the cross-linking agent and a significant shift of this process towards low temperatures as the content of PMA in the IPN increases is observed. This feature was confirmed using dynamic-mechanical measurements. (c) 2005 Elsevier B.V. All rights reserved.
机译：以乙二醇二甲基丙烯酸酯为交联剂，通过自由基聚合制备了两个系列的聚（丙烯酸甲酯）-聚苯乙烯顺序互穿聚合物网络。在其中之一中，交联密度非常低，而IPN呈现相分离。 IPN中的主要介电弛豫出现在频率轴上的相同位置，并且几乎具有与纯PMA网络相同的形状。然而，随着聚苯乙烯含量的增加，IPN中松弛强度与PMA的重量分数之比略有下降。 IPN的其他系列是高度交联的，在这些IPN中，介电弛豫仍在与纯PMA网络几乎相同的温度下出现，但是其形状发生了变化，并且归一化弛豫强度显着降低。由于交联剂的极性，还可以观察到归因于富含聚苯乙烯的相的主要弛豫，并且随着IPN中PMA含量的增加，该过程向低温的明显转变。使用动态机械测量可以确认此功能。 （c）2005 Elsevier B.V.保留所有权利。

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