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Polymer-based nanocomposites properties are greatly affected by interfacial interaction. Polyacrylate nanocomposites have been widely studied, but few studies have been conducted on their interface mechanism. Therefore, there was an urgent demand for providing a thorough understanding of the polymethyl acrylate/SiO 2 (PMA/SiO 2 ) nanocomposites to obtain the desired macro-performance. In this paper, a methodology, which combined molecular dynamics simulation with experimental researches, was established to expound the effect of the surface structure of SiO 2 particles which were treated with KH550, KH560 or KH570 (KH550-SiO 2 , KH560-SiO 2 and KH570-SiO 2 ) on the mechanical characteristic and water vapor permeability of polymethyl acrylate/SiO 2 nanocomposites. The polymethyl acrylate/SiO 2 nanocomposites were analyzed in binding energy and mean square displacement. The results indicate that PMA/KH570-SiO 2 had the highest tensile strength, while PMA/KH550-SiO 2 had the highest elongation at break at the same filler content; KH550-SiO 2 spheres can significantly improve water vapor permeability of polyacrylate film.

polymers

Surface Modification Design for Improving the Strength and Water Vapor Permeability of Waterborne Polymer/SiO2 Composites: Molecular Simulation and Experimental Analyses