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A novel polyhedral oligomeric silsesquioxane-modified layered double hydroxide: preparation characterization and properties

机译:一种新型多面体低聚倍半硅氧烷改性的层状双氢氧化物:制备表征和性能

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摘要

A novel layered double hydroxide modified by octa-substituted carboxy-terminated polyhedral oligomeric silsesquioxane was prepared via a one-step method and characterized by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, elemental analysis, thermogravimetric analysis, and microscale combustion calorimetry (MCC). Results showed that the silsesquioxane modified-LDH (OLDH) revealed an increase in the interlayer distance, nanoscale plate-like morphology of primary particles, and improved thermal stability. A synergistic effect between the siloxane moiety and Mg–Al hydroxide was found during thermal degradation, and confirmed by the study of degradation kinetics together with the analysis of the surface morphologies and elemental components of char residues. Moreover, in contrast to conventional organic modified LDH (e.g., dodecylbenzenesulfonate-LDH), the MCC results showed a significant decrease in the heat release rate and total heat release, indicating the low flammability of OLDH.
机译:通过一步法制备了由八取代的羧基封端的多面体低聚倍半硅氧烷改性的新型层状双氢氧化物,并通过傅里叶变换红外光谱,X射线光电子能谱,X射线衍射,透射电子显微镜,扫描电子进行了表征。显微镜,元素分析,热重分析和微型燃烧量热法(MCC)。结果表明,倍半硅氧烷改性的LDH(OLDH)揭示了层间距离的增加,一次颗粒的纳米级板状形态以及改善的热稳定性。在热降解过程中发现了硅氧烷部分与Mg-Al氢氧化物之间的协同作用,并通过对降解动力学的研究以及对炭残渣的表面形态和元素成分的分析得到了证实。而且,与常规的有机改性的LDH(例如十二烷基苯磺酸盐-LDH)相反,MCC结果显示放热速率和总放热显着降低,表明OLDH的低易燃性。

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