Preparation of VO2@KH550/570@PS composite film and its thermally induced phase change properties
Low-cost and large-scale thin-film production technology is the key to the popularization of thermally induced phase change vanadiam dioxide VO2(M)in the field of energy-saving windows.In this study,silane coupling agent KH550/KH570 was used to modify the surface of VO2(M)powder synthesized by solid phase method,and then polystyrene(PS)modified VO2@KH550/570@PS microspheres(VSPS)were obtained by microemulsion polymerization to systematically study the effect of surface modification on the properties and optical and thermal insulation performance of VO2(M)-based polymer composite films on the properties of VO2(M)based polymer films and the influence of optical and thermal insulation properties.The results show that the premodification of coupling agent is conducive to enhance the combination of PS and VO2 during emulsion polymerization,and the introduction of cross-linking agent MBA enhances the chemical stability of VSPS,which improves the dispersing ability of VO2 inorganic powders in the polymer solution system,and obtains more homogeneous polymer composite films.Among them,VS570PS/PVB has a high Tlum of 86.64％,a 12-fold improvement in ΔTsol compared to VO2/PVB,and the temperature difference between the blank glass is 16℃.This preparation technique of VSPS polymer composite film with both high light transmittance and heat insulation performance provides a useful idea for the application of VO2(M)as a smart window material.
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