Wang Zefeng, Ye Weiwei, Luo Xinran, Wang Zhonggang
Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Sci Rep. 2016 Apr 18;6:24682. doi: 10.1038/srep24682.
The motivation of this work is to create luminescent rare earth/polymer films with outstanding water-resistance and superhydrophobicity. Specifically, the emulsion polymerization of styrene leads to core particles. Then core-shell-structured polymer nanoparticles are synthesized by copolymerization of styrene and acrylic acid on the core surface. The coordination reaction between carboxylic groups and rare earth ions (Eu(3+) and Tb(3+)) generates uniform spherical rare earth/polymer nanoparticles, which are subsequently complexed with PTFE microparticles to obtain micro-/nano-scaled PTFE/rare earth films with hierarchical rough morphology. The films exhibit large water contact angle up to 161° and sliding angle of about 6°, and can emit strong red and green fluorescence under UV excitation. More surprisingly, it is found that the films maintain high fluorescence intensity after submersed in water and even in aqueous salt solution for two days because of the excellent water repellent ability of surfaces.
这项工作的目的是制备具有出色耐水性和超疏水性的发光稀土/聚合物薄膜。具体而言，苯乙烯的乳液聚合形成核颗粒。然后通过苯乙烯与丙烯酸在核表面的共聚反应合成核壳结构的聚合物纳米颗粒。羧基与稀土离子（Eu(3+)和Tb(3+)）之间的配位反应生成均匀的球形稀土/聚合物纳米颗粒，随后这些纳米颗粒与聚四氟乙烯微粒复合，从而获得具有分级粗糙形态的微/纳米尺度的聚四氟乙烯/稀土薄膜。该薄膜具有高达161°的大接触角和约6°的滑动角，并且在紫外光激发下能发出强烈的红色和绿色荧光。更令人惊讶的是，由于表面具有优异的疏水能力，发现该薄膜在水中甚至在盐水溶液中浸泡两天后仍能保持高荧光强度。
