Institut Charles Gerhardt (ICG), UMR5253 CNRS/UM2/ENSCM/UM1, Ingénierie et Architectures Macromoléculaires (IAM), Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France.
J Colloid Interface Sci. 2013 Oct 1;407:273-81. doi: 10.1016/j.jcis.2013.06.037. Epub 2013 Jun 27.
Three types of amphiphatic macro-RAFT agents were employed as compatibilizers to promote the polymerization reaction at the surface of nanoceria for the synthesis of CeO2-based hybrid latexes. Macro-RAFT copolymers and terpolymers were first synthesized employing various combinations of butyl acrylate as a hydrophobic monomer and acrylic acid (AA) and/or 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as hydrophilic monomers. After characterizing the adsorption of these macro-RAFT agents at the cerium oxide surface by UV-visible spectrometry, emulsion copolymerization reactions of styrene and methyl acrylate were then carried out in the presence of the surface-modified nanoceria. Dynamic Light Scattering and cryo-Transmission Electron Microscopy were employed to confirm the hybrid structure of the final CeO2/polymer latexes, and proved that the presence of acrylic acid units in amphiphatic macro-RAFT agents enabled an efficient formation of hybrid structures, while the presence of AMPS units, when combined with AA units, resulted in a better distribution of cerium oxide nanoclusters between latex particles.
三种两亲性大分子 RAFT 试剂被用作增容剂，以促进纳米氧化铈表面的聚合反应，从而合成基于 CeO2 的杂化胶乳。首先，通过各种组合的丙烯酸丁酯作为疏水性单体和丙烯酸 (AA) 和/或 2-丙烯酰胺基-2-甲基丙磺酸 (AMPS) 作为亲水性单体，合成了大分子 RAFT 共聚物和三元共聚物。通过紫外可见光谱法对这些大分子 RAFT 试剂在氧化铈表面的吸附进行表征后，然后在表面改性纳米氧化铈存在下进行苯乙烯和甲基丙烯酸甲酯的乳液共聚反应。动态光散射和冷冻透射电子显微镜用于确认最终 CeO2/聚合物胶乳的杂化结构，并证明两亲性大分子 RAFT 试剂中存在丙烯酸单元能够有效地形成杂化结构，而 AMPS 单元的存在与 AA 单元结合，导致氧化铈纳米簇在乳胶颗粒之间更好地分布。
