Laboratoire de Chimie des Polymères Organiques, CNRS, Université Bordeaux I, ENSCPB. 16, Avenue Pey Berland, 33607 Pessac Cedex, France.
Langmuir. 2010 Dec 21;26(24):18617-20. doi: 10.1021/la103963z. Epub 2010 Nov 16.
We describe the preparation, by precipitation copolymerization, of multifunctional divinylbenzene-co-pentafluorostyrene microspheres able to produce superhydrophobic surfaces or disperse in aqueous media upon annealing either in air or water, respectively. For that purpose, an amphiphilic block copolymer, polystyrene-b-poly(acrylic acid), was introduced in the initial feed composed of divinylbenzene and 2,3,4,5,6-pentafluorostyrene. As a result, fluorinated particles were obtained in which the diblock copolymer was encapsulated during the polymerization step. Upon annealing in dry air, the particles are completely hydrophobic and form superhydrophobic surfaces. On the contrary, annealing in water induces the reorientation of the PAA groups toward the particle interface, thus the particles can be dispersed in aqueous media. In addition, the presence of carboxylic acid groups at the particle interface permits us to switch the surface charge between negative and neutral depending on the environmental pH.
我们通过沉淀共聚的方法制备了多功能的二乙烯基苯-共-五氟苯乙烯微球，这些微球能够在空气或水中退火时分别产生超疏水表面或分散在水相介质中。为此，我们在由二乙烯基苯和 2,3,4,5,6-五氟苯乙烯组成的初始进料中引入了一种两亲嵌段共聚物聚苯乙烯-b-聚（丙烯酸）。结果，在聚合步骤中，嵌段共聚物被包封在氟化颗粒中。在干燥空气中退火时，颗粒完全疏水并形成超疏水表面。相反，在水中退火会导致 PAA 基团重新定向到颗粒界面，从而使颗粒能够分散在水相介质中。此外，颗粒界面处的羧酸基团的存在允许我们根据环境 pH 值在负电荷和中性之间切换表面电荷。
