文献类型：期刊文献

英文题名：Living Crystallization-Driven Self-Assembly of Oligo(p-phenylene vinylene)-Containing Block Copolymers: Impact of Branched Structure of Alkyl Side Chain of π-Conjugated Segment

作者：Song, Yang[1,3];Xiang, Bo[3];Huang, Xiao-Yu[3];Lu, Guo-Lin[3];Feng, Chun[1,2,3]

机构：[1]Univ Shanghai Sci & Technol, Sch Mat & Chem, Shanghai 200093, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[3]Univ Chinese Acad Sci, Shanghai Inst Organ Chem, Chinese Acad Sci, Key Lab Synthet & Self Assembly Chem Organ Funct M, Shanghai 200032, Peoples R China

年份：2023

卷号：41

期号：4

起止页码：574

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20230113331919);WOS:【SCI-EXPANDED(收录号:WOS:000906320500002)】；

基金：This work was financially supported by National Science Foundation for Distinguished Young Scholars (No. 51825304), the National Natural Science Foundation of China (Nos. 52122314, U22A20131, 51873229 and 51961145103), the Youth Innovation Promotion Association of CAS (No. Y2020062), Shanghai Scientific and Technological Innovation Project (Nos. 20JC1415400, 21520780100, 22JC1401000 and 22ZR1475400), Innovation Program of Shanghai Municipal Education Commission (No. 2019-01-07-00-05-E00012) and East China University of Science and Technology (No. SLD13223004). The authors thank Dr. Kun Cui for his assistance in TEM measurements and the beamline BL16B1 at SSRF for providing the beam time.

语种：英文

外文关键词：pi-Conjugated polymer; Nanofiber; Living crystallization-driven self-assembly; Structure effect

摘要：The structure of side chains of pi-conjugated segments is a critical factor determining living crystallization-driven self-assembly (CDSA), a versatile platform to generate fiber-like nanostructures with precise length and composition. Herein, we design and synthesize three block copolymers (BCPs) containing same corona-forming poly(N-isopropyl acrylamide) (PNIPAM) segment, but different core-forming pi-conjugated oligo(p-phenylene vinylene) (OPV) with linear pentyl (l-OPV), racemic 2-methyl butyl (r-OPV) and stereo-regular chiral (S)-2-methyl butyl (c-OPV) side chains, respectively. By using these BCPs of l-OPV-b-PNIPAM47, r-OPV-b-PNIPAM47 and c-OPV-b-PNIPAM47 as model, we aim to get a deep insight into how steric and stereo-regular effect induced by branched alkyl side chains of OPV segment affects the living CDSA. The results showed that l-OPV-b-PNIPAM47 exhibits typical characteristics of self-seeding and seeded growth of living CDSA to give uniform fiber-like micelles of controlled length. On the contrary, r-OPV-b-PNIPAM47 and c-OPV-b-PNIPAM47 with branched racemic and stereo-regular chiral alkyl side chains are more prone to self-nucleation during the micellar elongation to give short and polydisperse fiber-like micelles. The obvious self-nucleation during the micellar elongation of r-OPV-b-PNIPAM47 and c-OPV-b-PNIPAM47 is due to the increase of steric repulsion with OPV units induced by branched alkyl side chains, not the stereo-irregular effect of racemic alkyl side chains.