Influence of polymeric polarity on the interface of nanocomposites

Proceedings of 2011 International Symposium on Electrical Insulating Materials Pub Date : 2011-09-01 DOI:10.1109/ISEIM.2011.6826317

Shengtao Li, G. Yin, Cheng Cheng, Jianying Li

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引用次数: 1

Abstract

A polar polymer and a non-polar polymer are selected as polymeric matrix. Nano-TiO2 is selected as filler and incorporated with such two polymers to construct nanocomposites, respectively. Their thermal behaviors are tested by differential scanning calorimetry. Meanwhile, their dielectric responses and ac electrical strengths are measured. Results indicate that Tg of epoxy nanocomposites is lower than that of neat epoxy resin due to the existence of nanoparticles. However, thermal behavior has no change in LDPE nanocomposites. The dielectric responses also indicate a great deal of difference between the both nanocomposites. However, ac electrical strength first increases then decreases with increasing nanoparticles loading for both kinds of nanocomposites. From the results, it seems that there is a weak relationship between Tg and electrical strength. The polarity of polymer may influence the bond strength between nanoparticles and polymeric matrix. This bond strength affects the arrangement and the mobility of polymeric molecule chain at the interface, which may cause the changes of Tg.

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聚合物极性对纳米复合材料界面的影响

选取极性聚合物和非极性聚合物作为聚合物基体。选择纳米tio2作为填料，分别与这两种聚合物掺入构建纳米复合材料。用差示扫描量热法测试了它们的热行为。同时，测量了它们的介电响应和交流电强度。结果表明，由于纳米颗粒的存在，环氧纳米复合材料的Tg低于纯环氧树脂;然而，LDPE纳米复合材料的热行为没有变化。介质响应也表明两种纳米复合材料之间存在很大差异。然而，两种纳米复合材料的交流电强度都随着纳米颗粒负载的增加先增加后降低。从结果来看，Tg与电强度之间似乎存在较弱的关系。聚合物的极性会影响纳米颗粒与聚合物基体的结合强度。这种结合强度影响了聚合物分子链在界面处的排列和迁移率，从而引起Tg的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of 2011 International Symposium on Electrical Insulating Materials

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