Series of clay‐containing nanocomposites have been prepared and investigated using frequency‐domain dielectric spectroscopy at different temperatures. Different matrix materials have been used: neat low‐density polyethylene (LDPE) with and without compatibilizer and co‐continuous blends of LDPE with two grades of polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene (SEBS) copolymers. Two major relaxation modes were detected in the dielectric losses of all the nanocomposites and associated with Maxwell–Wagner–Sillars interfacial polarization and dipolar relaxation, respectively. Characteristic relaxation rates, activation energies, dielectric strength, and shape parameters of these relaxation mechanismes were calculated and discussed for the LDPE/clay nanocomposites. The addition of compatibilizer was found to slightly increase the dielectric loss of the nanocomposites while slowing the dynamics due to an improved dispersion. When combined with a high loading of nanofiller (15%), the compatibilizer addition led to low‐frequency dispersion. A new relaxation process was then observed for the nanocomposites with the blend matrix. Several speculations were made as to the origin of this phenomenon, all of which were related to the SEBS phase. POLYM. ENG. SCI., 60:968–978, 2020. © 2020 Society of Plastics Engineers

中文翻译：

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含粘土低密度聚乙烯共混物和纳米复合材料的介电弛豫动力学

制备了一系列含粘土的纳米复合材料，并在不同温度下使用频域介电谱进行了研究。使用了不同的基质材料：带或不带增容剂的纯净低密度聚乙烯（LDPE），以及LDPE与两种等级的聚苯乙烯-b-聚（乙烯-共聚）的共连续共混物-丁烯）-b-聚苯乙烯（SEBS）共聚物。在所有纳米复合材料的介电损耗中检测到两种主要的弛豫模式，分别与Maxwell–Wagner–Sillars界面极化和偶极弛豫相关。计算并讨论了LDPE /粘土纳米复合材料的特征弛豫速率，活化能，介电强度和形状参数。发现添加相容剂会稍微增加纳米复合材料的介电损耗，同时由于分散性的改善而降低动力学。当与高含量的纳米填料（15％）结合使用时，添加的相容剂会导致低频分散。然后观察到具有混合基质的纳米复合材料的新的松弛过程。对这种现象的起源进行了一些推测，所有这些都与SEBS阶段有关。POLYM。ENG。SCI。，60：968–978，2020.©2020塑料工程师协会