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Influence of Fe-MMT on crosslinking and thermal degradation in silicone rubber/clay nanocomposites

机译：Fe-MMT对硅橡胶/粘土纳米复合材料交联和热降解的影响

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In this article, silicone rubber (SR)/clay nanocomposites were synthesized by a melt-intercalation process using synthetic Fe-montmorillonite (Fe-MMT) and natural Na-MMT which were modified by cetyltrimethyl ammonium bromide (CTAB). This study has been designed to determine if the presence of structural iron in the matrix can result in radical trapping and then enhance thermal stability, affect the crosslinking degree and elongation. The SR/clay nanocomposites were characterized by X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM). Exfoliated and intercalated nanocomposites were obtained. Thermo gravimetric analysis (TGA) and mechanical performance were applied to test the properties of the SR/clay nanocomposites. The presence of iron significantly increased the onset temperature of thermal degradation in SR/Fe-MMT nanocomposites. The thermal stability, gel fraction and mechanical property of SR/Fe-MMT were different from the SR/Na-MMT nanocomposites. So the iron not only in thermal degradation but in the vulcanization process acted as an antioxidant and radicals trap.
机译：在本文中，通过熔融插入工艺，使用十六烷基三甲基溴化铵（CTAB）改性的合成铁蒙脱土（Fe-MMT）和天然Na-MMT，合成了硅橡胶（SR）/粘土纳米复合材料。本研究旨在确定基质中结构铁的存在是否会导致自由基捕获，然后增强热稳定性，影响交联度和伸长率。 SR /粘土纳米复合材料的特征在于X射线衍射（XRD）图和透射电子显微镜（TEM）。获得剥离和嵌入的纳米复合材料。应用热重分析（TGA）和机械性能来测试SR /粘土纳米复合材料的性能。铁的存在显着提高了SR / Fe-MMT纳米复合材料中热降解的起始温度。 SR / Fe-MMT的热稳定性，凝胶分数和力学性能与SR / Na-MMT纳米复合材料不同。因此，铁不仅在热降解过程中而且在硫化过程中均充当了抗氧化剂和自由基的陷阱。

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