Zhang Jie, Wang Chen, Zhao Hanying
Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, PR China.
Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, PR China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt B):1281-1292. doi: 10.1016/j.jcis.2023.10.138. Epub 2023 Oct 28.
Latex polymer particles have been widely used in industry and everyday life. For decades the fabrication of "smart" latex film from latex particles has been a great challenge due to the difficulty in the synthesis of the functional latex particles by traditional emulsion polymerization using small molecular surfactants. In this manuscript, a simple and environmentally-friendly approach to the fabrication of "smart" latex films with dynamic surfaces is reported. Latex particles with poly(n-butyl methacrylate) (PnBMA) in the cores and zwitterionic poly-3-[dimethyl-[2-(2-methylprop-2-enoyloxy) ethyl]azaniumyl]propane-1-sulfonate (PDMAPS) in the shells are synthesized by reversible addition-fragmentation chain transfer (RAFT) mediated surfactant-free emulsion polymerization. The kinetics for the emulsion polymerization is studied, and the latex particles are analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and dynamic light scattering (DLS). Latex films are prepared by casting aqueous solutions of the latex particles at temperatures above the glass transition temperature (T) of PnBMA. On the dried latex film, the hydrophobic PnBMA blocks occupy the top surface; after water treatment, the hydrophilic PDMAPS blocks migrate to the surface. A change in the surface hydrophilicity results in a change in the water contact angle of the latex film. A mechanism for the formation of the dynamic surface structure is proposed in this research. Antifouling applications of the latex films are investigated. Experimental results indicate that the water-treated latex film is able to efficiently inhibit protein adsorption and resist bacterial adhesion.
乳胶聚合物颗粒已在工业和日常生活中得到广泛应用。几十年来，由于使用小分子表面活性剂通过传统乳液聚合合成功能性乳胶颗粒存在困难，由乳胶颗粒制备“智能”乳胶膜一直是一项巨大挑战。在本论文中，报道了一种简单且环保的制备具有动态表面的“智能”乳胶膜的方法。通过可逆加成-断裂链转移（RAFT）介导的无表面活性剂乳液聚合，合成了核为聚甲基丙烯酸正丁酯（PnBMA）、壳为两性离子聚-3-[二甲基-[2-(2-甲基丙烯酰氧基)乙基]铵基]丙烷-1-磺酸盐（PDMAPS）的乳胶颗粒。研究了乳液聚合的动力学，并通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）和动态光散射（DLS）对乳胶颗粒进行了分析。通过在高于PnBMA玻璃化转变温度（T）的温度下浇铸乳胶颗粒的水溶液来制备乳胶膜。在干燥的乳胶膜上，疏水性的PnBMA嵌段占据顶面；经过水处理后，亲水性的PDMAPS嵌段迁移到表面。表面亲水性的变化导致乳胶膜水接触角的改变。本研究提出了动态表面结构形成的机制。研究了乳胶膜的防污应用。实验结果表明，经过水处理的乳胶膜能够有效抑制蛋白质吸附并抵抗细菌粘附。
