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Nanocomposites at elevated temperatures: migration and structural changes

机译：高温下的纳米复合材料：迁移和结构变化

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摘要

The possible effect of temperature stability of organic layered silicates (OLSs) on the structure and flammability behavior of polymer/montmorillonite (MMT) nanocomposites has been discussed in a previous publication. Above 200℃, the OLS begins to decompose, and the nanocomposite structure is gradually destroyed even before pyrolysis and combustion. Data on the decomposition of polymer/ OLS mixtures upon isothermal thermogravimetric analysis (TGA) experiments are presented, and include rates and energies of activation at a range of temperatures from 200 to 400℃. Decomposition of OLSs in the presence of polymer is discussed in view of the decomposition of clay, pristine surfactant, and OLS. Accumulation of clay by migration to the surface of samples at a range of temperatures is indicated by X-ray diffraction (XRD) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) measurements on the isothermally heated samples. Mechanistic considerations concerning changes in the structure of the nanocomposite, the decomposition of OLS, and migration of clay will be presented.
机译：在以前的出版物中已经讨论了有机层状硅酸盐（OLS）的温度稳定性对聚合物/蒙脱土（MMT）纳米复合材料的结构和可燃性行为的可能影响。在200℃以上，OLS开始分解，甚至在热解和燃烧之前，纳米复合结构就逐渐被破坏。给出了等温热重分析（TGA）实验中聚合物/ OLS混合物分解的数据，包括在200至400℃温度范围内的活化速率和能量。考虑到粘土，原始表面活性剂和OLS的分解，讨论了在聚合物存在下OLS的分解。通过在等温加热的样品上进行X射线衍射（XRD）和衰减的全反射傅立叶变换红外（ATR-FTIR）测量，可以表明在一定温度范围内迁移到样品表面而引起的粘土累积。将提出有关纳米复合材料结构变化，OLS分解和粘土迁移的力学考虑。

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