文献类型：期刊文献

英文题名：Fluorine-free superhydrophobic/hydrophobic polybenzoxazine/TiO2 films with excellent thermal stability and reversible wettability

作者：Zhang, Wenfei[1];Lu, Xin[1];Xin, Zhong[1];Zhou, Changlu[1];Liu, Juan[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Multiphase Struct Mat Chem Engn, State Key Lab Chem Engn, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：5

期号：68

起止页码：55513

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20152700988923);WOS:【SCI-EXPANDED(收录号:WOS:000357051100089)】；

基金：This work was financially supported by the Nanotech Foundation of Science and Technology Commission of Shanghai Municipality (0652nm001), the Program of Shanghai Subject Chief Scientist (10XD1401500), the Fundamental Research Funds for the Central Universities (WA1514015), and the China Postdoctoral Science Foundation (2015M571509).

语种：英文

外文关键词：Nanocomposite films - Contact angle - Glass substrates - Nanocomposites - Heat treatment - Hydrophobicity - Monomers - Wetting - Film preparation - Fluorine - Hydrophilicity - Surface treatment - Free energy

摘要：Two important properties are combined: the low surface free energy property of polybenzoxazine (PBZ) and the photo-induced superhydrophilicity property of TiO2. A benzoxazine monomer, synthesized by a one-step method, is incorporated with TiO2. Polybenzoxazine/titanium dioxide (PBZ/TiO2) nanocomposite films are prepared using spin coating and a thermal curing method. As a result, a superhydrophobic PBZ/TiO2 film with the largest water contact angle (CA) of similar to 166 +/- 1 degrees is developed by incorporating a low content of TiO2 (11 wt%, relative to the weight of the benzoxazine monomer) into a PBZ system without any fluorine-containing surface modification agents. The as-prepared superhydrophobic film has good adhesion to glass substrates, and its superhydrophobicity is stable even after heat treatment at 300 degrees C for 1 h and environmentally durable for more than half a year. When the content of TiO2 is increased to 60%, the consequent nanocomposite film exhibits hydrophobicity-superhydrophilicity transitions with a variation of around 125 degrees in water CA upon ultraviolet (UV) exposure-heat treatment cycles. The effects of the content of TiO2 on the surface wettability, morphology and reversibly switchable wettability of the PBZ/TiO2 films are investigated in detail.