In this study, we report the preparation of branched block copolymer assemblies by photoinitiated reversible addition–fragmentation chain transfer (RAFT) self-condensing vinyl dispersion polymerization in water at room temperature mediated by a binary mixture of a macromolecular RAFT (macro-RAFT) agent and chain-transfer monomer (CTM). Decreasing the [macro-RAFT]/[CTM] ratio led to the formation of branched block copolymers with higher molecular weights and higher degrees of branching. Moreover, branched block copolymer assemblies with various morphologies (including worms and vesicles) were prepared by changing the [macro-RAFT]/[CTM] ratio and a morphological phase diagram was constructed. The obtained branched block copolymer vesicles can be used as seeds for further chain extension via seeded polymerization of a water-miscible monomer or a water-immiscible monomer. Finally, reduction-responsive branched block copolymer assemblies were prepared using a disulfide-linked CTM, demonstrating the potential of this method for the preparation of stimuli-responsive polymers.

中文翻译：

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通过光引发的RAFT自缩乙烯分散聚合高效制备支链嵌段共聚物组件

在这项研究中，我们报道了在室温下由光引发的可逆加成-断裂链转移（RAFT）自缩合乙烯基分散体聚合反应在水中制备大分子RAFT（macro-RAFT）试剂的二元介导的支化嵌段共聚物组件的制备。和链转移单体（CTM）。[宏-RAFT] / [CTM]比的降低导致形成具有更高分子量和更高支化度的支化嵌段共聚物。此外，通过改变[macro-RAFT] / [CTM]的比例，制备了具有各种形态（包括蠕虫和囊泡）的支链嵌段共聚物组件，并构建了形态相图。所获得的支链嵌段共聚物囊泡可以用作种子，用于通过水混溶性单体或水混溶性单体的种子聚合。最后，使用二硫键连接的CTM制备了具有还原反应能力的支链嵌段共聚物，这证明了该方法具有制备刺激反应性聚合物的潜力。