Linear and star block copolymer (BCP) nanoassemblies of [poly(4-vinylpyridine)-block-polystyrene]_n ([P4VP-b-PS]_n) with different arm numbers have been synthesized by RAFT dispersion polymerization under formulation of polymerization-induced self-assembly (PISA). All RAFT dispersion polymerizations employing mono- and multifunctional macromolecular chain transfer agents proceed with similar polymerization kinetics. The size and/or morphology of [P4VP-b-PS]_n nanoassemblies are firmly correlative to arm number n, and star [P4VP-b-PS]_n BCPs have more complex morphology than the linear counterpart. Several interesting morphologies of star BCPs including small-sized vesicles and porous nanospheres have been synthesized, and they are compared with those of the linear counterpart. Our research indicates that topology is a significant parameter to dedicate the size and morphology of star BCP nanoassemblies under PISA conditions.

中文翻译：

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影响嵌段共聚物纳米组件的拓扑：在PISA条件下线性嵌段共聚物与星形嵌段共聚物

在聚合引发的条件下，通过RAFT分散聚合合成了具有不同臂数的[聚（4-乙烯基吡啶）-嵌段-聚苯乙烯] _n（[P4VP- b -PS] _n）的线性和星形嵌段共聚物（BCP）纳米组件。自组装（PISA）。所有使用单官能和多功能大分子链转移剂的RAFT分散聚合均以相似的聚合动力学进行。[P4VP- b -PS] _n纳米组件的大小和/或形态与臂数n和星形[P4VP- b -PS] _n紧密相关。BCP具有比线性对应物更复杂的形态。已经合成了星形BCP的几种有趣的形态，包括小囊泡和多孔纳米球，并将其与线性对应物进行了比较。我们的研究表明，拓扑结构是决定在PISA条件下星形BCP纳米组件的尺寸和形态的重要参数。