Mechanistic Aspect of Reverse Atom Transfer Radical Polymerization of n-Butyl Methacrylate in Aqueous Dispersed System
Mechanistic Aspect of Reverse Atom Transfer Radical Polymerization of n-Butyl Methacrylate in Aqueous Dispersed System
复制标题
水分散体系中甲基丙烯酸正丁酯反向原子转移自由基聚合的机理
DOI：
10.1021/ma000720q
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发表时间：
2000
期刊：
影响因子：
5.5
通讯作者：
J. Vairon
中科院分区：
文献类型：
--
作者：
J. Qiu;T. Pintauer;S. Gaynor;K. Matyjaszewski;B. Charleux;J. Vairon
在水分散体系中进行了甲基丙烯酸正丁酯的反原子转移自由基聚合。采用水溶性引发剂（V-50）、非离子表面活性剂（brij98）和疏水配体（dNbpy）配合卤化铜，得到了摩尔质量控制较好、多分散性较低的聚合物。形成粒径在150 ~ 300 nm的稳定乳液。在不同的实验条件下进行了动力学研究。考察了催化剂、表面活性剂和引发剂的浓度以及温度对聚合速率、分子量和粒径的影响。由于在聚合初期缺乏高分子量聚合物，水相分散体系中的反ATRP可能具有与常规乳液聚合不同的“成核”机制。此外，引发剂的快速分解防止自由基连续进入。
Reverse atom transfer radical polymerization (ATRP) of n-butyl methacrylate was conducted in an aqueous dispersed system. Using a water-soluble initiator (V-50), a nonionic surfactant (Brij 98), and a hydrophobic ligand (dNbpy) to complex a copper halide, polymers with relatively well controlled molar masses and low polydispersities were obtained. Stable latexes with particle diameters within 150−300 nm were formed. Kinetic studies were performed under various experimental conditions. The influence of the concentrations of the catalyst, the surfactant, and the initiator as well as the temperature on the polymerization rate, molecular weight, and particle size was investigated. Because of the lack of high molecular weight polymer during the early polymerization stage, reverse ATRP in the aqueous dispersed system presumably has a different “nucleation” mechanism from that of a conventional emulsion polymerization. In addition, fast decomposition of the initiator prevents the continuous entry of radicals int...