VO_(2)@PMMA微胶囊的原位制备及其热致变色涂层性能

In situ preparation of VO_2@PMMA microcapsule and thermochromic properties of its coating

M相二氧化钒(VO_(2)(M))能够响应外界温度变化而改变红外波段透过率,成为热致变色智能窗涂层的首选材料。球磨法工艺设备简单、易于操作、反应时间短、无废液产生,适合工业化生产,但球磨VO_(2)稳定性差、易团聚在实际应用中面临重大挑战。本文基于原位聚合法制备了二氧化钒@聚甲基丙烯酸甲酯(VO_(2)@PMMA)微胶囊并辊涂构建热致变色涂层。甲基丙烯酸甲酯(MMA)单体在球磨法制备的VO_(2)颗粒表面通过共价键原位聚合得到尺寸均匀、耐酸抗氧化能力强的VO_(2)@PMMA微胶囊。VO_(2)@PMMA热致变色涂层不仅具有良好的抗酸和抗氧化能力,而且可见光透过率(T_(lum))为77.89%时涂层的太阳光调制能力(ΔT_(sol))高达10.12%,具有优异的光学性质,满足智能窗的应用需求。

Vanadium dioxide(VO_(2))can change infrared transmittance in response to external temperature changes,and has become the preferred material for thermochromic smart windows.The facile ball milling method is simple,easy to operate,short reaction time,less pollution,suitable for industrial production.However,there are still some problems with vanadium dioxide that may hinder large scale production and practical applications,such as poor stability and easily agglomeration.Here we report on the preparation of thermochromic coating based on VO_(2)@polymethyl methacrylate(PMMA)microcapsule synthesized through in-situ polymerized method.Uniform VO_2@PMMA microcapsules was obtained by in situ polymerization of double bonds on the surface of VO_(2)and methyl methacrylate(MMA)monomer.The space barrier effect of in-situ polymerized PMMA is used to prevent VO_(2)agglomeration.With good compactness PMMA prevent air and moisture from contacting VO_(2),which improve VO_(2)stability.VO_(2)@PMMA films prepared by a roll coating method not only has good acid resistance and oxidation resistance,but also has excellent optical properties with the solar modulation efficiency(ΔT_(sol))10.12%at 77.89%visible light transmittance(T_(lum)),which meets the application requirements of smart windows.