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

作　　者：Yang Song Bo Xiang Xiao-Yu Huang Guo-Lin Lu Chun Feng 

机构地区：[1]School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai,200093,China [2]Shanghai Key Laboratory of Advanced Polymeric Materials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai,200237,China [3]Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules,Shanghai Institute of Organic Chemistry,University of Chinese Academy of Sciences,Chinese Academy of Sciences,Shanghai,200032,China

出　　处：《Chinese Journal of Polymer Science》2023年第4期574-584,I0008,共12页高分子科学（英文版）

基　　金：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);East China University of Science and Technology(No.SLD13223004).

摘　　要：The structure of side chains ofπ-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-formingπ-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-PNIPAM_(47),r-OPV-b-PNIPAM_(47)and c-OPV-b-PNIPAM_(47)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-PNIPAM_(47)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-PNIPAM_(47)and c-OPV-b-PNIPAM_(47)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 selfnucleation during the micellar elongation of r-OPV-b-PNIPAM_(47)and c-OPV-b-PNIPAM_(47)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.

关 键 词：π-Conjugated polymer Nanofiber Living crystallization-driven self-assembly Structure effect 

分 类 号：O63[理学—高分子化学]