文献类型：期刊文献

英文题名：Structural Difference in the Core-forming Block Reshapes RAFT-mediated Polymerization-induced Self-assembly

作者：Zhan, Yue-Xi[1];Zhang, Li[1,2];Feng, Chun[3];Tan, Jian-Bo[1,2]

机构：[1]Guangdong Univ Technol, Sch Mat & Energy, Dept Polymer Mat & Engn, Guangzhou 510006, Peoples R China;[2]Guangdong Prov Key Lab Funct Soft Condensed Matter, Guangzhou 510006, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2025

卷号：43

期号：3

起止页码：429

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20250717845127);WOS:【SCI-EXPANDED(收录号:WOS:001401118700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 22171055 and 52222301), the Guangdong Natural Science Foundation for Distinguished Young Scholar (No. 2022B1515020078) and the Science and Technology Program of Guangzhou (No. 2024A04J2821). They would like to thank Wei Song of Analysis and Test Center of Guangdong University of technology for DLS measurement.

语种：英文

外文关键词：Polymerization-induced self-assembly; RAFT polymerization; Block copolymer nanoparticles; Branched structure

摘要：Polymerization-induced self-assembly (PISA) has become one of the most versatile approaches for scalable preparation of linear block copolymer nanoparticles with various morphologies. However, the controlled introduction of branching into the core-forming block and the effect on the morphologies of block copolymer nanoparticles under PISA conditions have rarely been explored. Herein, a series of multifunctional macromolecular chain transfer agents (macro-CTAs) were first synthesized by a two-step green light-activated photoiniferter polymerization using two types of chain transfer monomers (CTMs). These macro-CTAs were then used to mediate reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of styrene (St) to prepare block copolymers with different core-forming block structures and the assemblies. The effect of the core-forming block structure on the morphology of block copolymer nanoparticles was investigated in detail. Transmission electron microscopy (TEM) analysis indicated that the brush-like core-forming block structure facilitated the formation of higher-order morphologies, while the branched core-forming block structure favored the formation of lower-order morphologies. Moreover, it was found that using macro-CTAs with a shorter length also promoted the formation of higher-order morphologies. Finally, structures of block copolymers and the assemblies were further controlled by changing the structure of macro-CTA or using a binary mixture of two different macro-CTAs. We expect that this work not only sheds light on the synthesis of block copolymer nanoparticles but also provide important mechanistic insights into PISA of nonlinear block copolymers.