School of Materials Science and Engineering, and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300072, China.
ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22959-22969. doi: 10.1021/acsami.7b05286. Epub 2017 Jun 29.
Highly transparent antifogging/anti-icing coatings were developed from amphiphilic block copolymers of polyhedral oligomeric silsesquioxane-poly[2-(dimethylamino)ethyl methacrylate]-block-poly(sulfobetaine methacrylate) (POSS-PDMAEMA-b-PSBMA) with a small amount of ethylene glycol dimethacrylate (EGDMA) via UV-curing. The excellent antifogging properties of the prepared coatings were originated from the hygroscopicity of both PDMAEMA and PSBMA blocks in the semi-interpenetrating polymer network (SIPN) with polymerization of EGDMA and hydrophobic POSS clusters aggregated on the surface. PDMAEMA with a lower critical solution temperature and PSBMA with an upper critical solution temperature in the block copolymers facilitated dispersion and absorption of water molecules into the SIPN coatings, fulfilling the enhanced antifogging function. Analysis of differential scanning calorimetry further confirmed that there was bond water and nonfreezable bond water in the SIPN coatings. The amphiphilic SIPN coatings exhibited the anti-icing ability with a freezing delay time of more than 2 min at -15 °C, owing to the aggregation of hydrophobic POSS groups and the self-lubricating aqueous layer generated by nonfreezable bond water on the surface. The prepared transparent antifogging/anti-icing coatings could have novel potential applications in practice.
通过紫外光固化，由低聚倍半硅氧烷-聚[2-（二甲氨基）乙基甲基丙烯酸酯]-嵌段-聚（磺酸甜菜碱甲基丙烯酸酯）（POSS-PDMAEMA-b-PSBMA）与少量的二乙二醇二甲基丙烯酸酯（EGDMA）制备得到具有高透明性的防雾/抗结冰涂层。所制备的涂层具有优异的防雾性能，这归因于 PDMAEMA 和 PSBMA 嵌段在 SIPN 中的吸湿性，以及 EGDMA 的聚合和疏水性 POSS 簇聚集在表面。嵌段共聚物中的 PDMAEMA 具有较低的临界溶解温度，PSBMA 具有较高的临界溶解温度，这有利于水分子在 SIPN 涂层中的分散和吸收，从而增强了防雾功能。差示扫描量热法分析进一步证实，SIPN 涂层中存在结合水和不可冻结的结合水。由于疏水性 POSS 基团的聚集以及表面不可冻结结合水产生的自润滑水层，具有两亲性的 SIPN 涂层在-15°C 时表现出超过 2 分钟的延迟结冰能力。所制备的透明防雾/抗结冰涂层在实际中可能具有新颖的潜在应用。
