Amphiphilic Block Copolymer-Functionalized VO2 Nanocomposites for Smart Waterborne Polyurethane Coatings

en This link goes to a English section zh This link goes to a Chinese section Aqueous vanadium dioxide (VO 2 )-based smart thermal insulation coatings represent a viable strategy to decrease building energy consumption and advance sustainable development goals. However, the inherent instability and limited compatibility with polymer matrices of VO 2 hinder its widespread application. Herein, a core-shell structured nanocomposite, VO 2 @poly(hexafluorobutyl methacrylate- block - N , N -dimethylacrylamide) (VO 2 @PHFBMA- b -PDMA), is developed and applied to water-based intelligent coatings. The experimental results show that the designed block copolymer shell PHFBMA- b -PDMA not only has excellent acid and oxidation resistance but also improves the water dispersion stability of VO 2 , ensuring the compatibility between VO 2 and the organic polymer matrix. Moreover, the shell can effectively increase the carrier concentration in VO 2 , thereby significantly enhancing the local surface plasmon resonance effect and giving it excellent optical performance. By optimizing the formula and incorporating the VO 2 @PHFBMA- b -PDMA nanocomposites into water-based polyurethane resins, the resulting coating exhibits excellent adhesion, high hardness, and strong resistance to thermal cycling and ultraviolet aging. In addition, the coating has significant thermochromic properties, which can transmit near-infrared radiation at low temperatures and effectively shield near-infrared radiation at high temperatures. Compared with uncoated glass, the designed coated glass can reduce indoor temperature by approximately 5°C. 摘要 en This link goes to a English section zh This link goes to a Chinese section 二氧化钒(VO 2 )基水性智能隔热涂料,为实现建筑节能与可持续发展提供了可行策略。然而,VO 2 本身的不稳定性及其与聚合物基质相容性较差的问题,限制了其实际应用。为此,本研究制备了一种核壳结构纳米复合材料,VO 2 @聚(甲基丙烯酸六氟丁酯- b - N , N -二甲基丙烯酰胺) (VO 2 @PHFBMA- b -PDMA),并将其用于水性智能涂料体系。结果表明,所设计的嵌段共聚物壳层PHFBMA- b -PDMA不仅具备优异的耐酸和抗氧化性能,还能显著提升VO 2 在水相中的分散稳定性,并改善其与有机聚合物基质之间的相容性。此外,该壳层能够有效增加VO 2 的载流子浓度,从而显著增强其局域表面等离子体共振效应,赋予材料更优的光学性能。通过配方优化,将VO 2 @PHFBMA- b -PDMA纳米复合材料引入水性聚氨酯树脂中,所得涂层表现出良好的附着力、高硬度、优异的抗热循环与抗紫外老化性能。该涂层还具备显著的热致变色性能,能够在低温状态下允许近红外光透过,而在高温条件下有效阻隔近红外光。与未涂覆的玻璃相比,涂覆该涂层的玻璃可使室内温度降低约5°C。