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首页> 外文期刊>Macromolecules >One-pot synthesis of poly(methacrylic acid-co-poly(ethylene oxide) methyl ether methacrylate)-b-polystyrene amphiphilic block copolymers and their self-assemblies in water via RAFT-mediated radical emulsion polymerization. A kinetic study
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One-pot synthesis of poly(methacrylic acid-co-poly(ethylene oxide) methyl ether methacrylate)-b-polystyrene amphiphilic block copolymers and their self-assemblies in water via RAFT-mediated radical emulsion polymerization. A kinetic study

机译：通过RAFT介导的自由基乳液聚合反应，一锅合成聚（甲基丙烯酸-共聚（环氧乙烷）甲基醚甲基丙烯酸甲酯）-b-聚苯乙烯两亲嵌段共聚物及其在水中的自组装。动力学研究

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The RAFT-mediated emulsion polymerization of styrene was carried out in a one-pot, two-step procedure using two poly(methacrylic acid-co-poly(ethylene oxide) methyl ether methacrylate) macroRAFT agents of different compositions carrying a reactive trithiocarbonate end-group. The latter were prepared in situ, directly in aqueous solution at acid pH. In all cases, the synthesis was fast and efficient, leading to very high conversions and very good control over the polymer features. It was moreover particularly reproducible, which is an important outcome for the robustness of the method. Then, styrene was added and directly polymerized in the formed emulsion system until very high conversion in short reaction time. The method led to amphiphilic block copolymers, self-assembled into stable spherical particles. The diameter of the latter was directly governed by the initial concentration of macroRAFT agent, which also controlled the molar mass of the polystyrene block at constant styrene initial concentration. The emulsion polymerization step was studied in detail to provide information on the overall mechanism: nucleation, conversion rate, and chain growth. Because of the reduction of the number of synthesis and purification steps and of the overall reaction time, and due to the use of water as the sole reaction medium, the proposed method is of high interest in terms of both respect of environmental constraints and energy saving.
机译：RAFT介导的苯乙烯乳液聚合是通过一锅两步程序进行的，使用了两种不同组成的带有反应性三硫代碳酸酯末端的聚（甲基丙烯酸-共聚（环氧乙烷）甲基醚甲基丙烯酸甲酯）macroRAFT试剂。组。后者是直接在酸性pH的水溶液中原位制备的。在所有情况下，合成都是快速高效的，从而导致很高的转化率和对聚合物特征的很好控制。而且它是特别可重现的，这对于该方法的鲁棒性是重要的结果。然后，加入苯乙烯并在形成的乳液体系中直接聚合，直到在短的反应时间内有很高的转化率。该方法导致两亲嵌段共聚物，其自组装成稳定的球形颗粒。后者的直径直接由macroRAFT剂的初始浓度控制，后者也将聚苯乙烯嵌段的摩尔质量控制在恒定的苯乙烯初始浓度下。对乳液聚合步骤进行了详细研究，以提供有关整体机理的信息：成核，转化率和链增长。由于减少了合成和纯化步骤的数量以及整个反应时间，并且由于使用了水作为唯一的反应介质，因此该方法在环境约束和节能方面都具有很高的兴趣。 。

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