Effects of modified nano-silica on the microstructure of PVDF and its microporous membranes
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In this study, effects of modified silica on the microstructure of polyvinylidene fluoride and its microporous membranes were investigated. The silica was modified by 3-Methacryloxypropyltrimethoxysilane to improve its compatibility with the polyvinylidene fluoride matrix. The relaxation time of polyvinylidene fluoride was markedly improved by modified nano-silica, especially at the loading of 0.1 wt‰. Effects of the modified silica on the nanocomposite microstructure, such as crystallization and orientation behavior, were studied in the manuscript. Furthermore, adding 3-Methacryloxypropyltrimethoxysilane modified silica could effectively handicap the relaxation of orientation structure in polyvinylidene fluoride and facilitate the formation of uniform lamellar structures which could be described by two-dimensional small-angle X-ray scattering testing. Finally, casting films with more uniform lamellar structure was also in favor of fabricating polyvinylidene fluoride microporous membranes by melt-stretching method.
KeywordsPolyvinylidene fluoride Modified silica Crystalline microstructure Orientation Microporous membrane
The authors sincerely acknowledge the financial support of National Natural Science Foundation of China (Grant number 51721091,21674069 and 21174092).
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