文献类型：期刊文献

英文题名：Co-Self-seeding: A facile approach to generate heterogeneous p-Conjugated Fiber-Like comicelles with tunable Length, composition and morphology

作者：Nie, Jiucheng[2,3];Wang, Zhongming[1];Xia, Longgang[1];Huang, Xiaoyu[2,3];Lu, Guolin[2];Feng, Chun[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Organ Chem, Key Lab Synthet & Selfassembly Chem Organ Funct Mo, Ctr Excellence Mol Synth,Univ Chinese Acad Sci, 345 Lingling Rd, Shanghai 200032, Peoples R China;[3]ShanghaiTech Univ, Sch Phys Sci & Technol, 100 Haike Rd, Shanghai 201210, Peoples R China

年份：2023

卷号：197

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001069456400001)】；

基金：The authors are thankful for financial support from National Science Foundation of China for Distinguished Young Scholars (51825304) , National Natural Science Foundation of China (52122314 and U22A20131) , the project of Bureau of International Cooperation, Chinese Academy of Sciences (121731KYSB20200006) , Shanghai Scientific and Technological Innovation Project (21ZR1481700, 21520780100, 22JC1401000 and 22ZR1475400) , Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-05-E00012) and East China University of Science and Technology. 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：Block copolymer; Self-assembly; Living crystallization-driven self-assembly; Nanofiber; P-conjugated polymer

摘要：Co-self-seeding approach of living crystallization-driven self-assembly (CDSA) enables the generation of fiber like micelles with a & pi;-conjugated core of tunable length/composition/ morphology with appealing photo physical and photochemical properties. However, our understanding on the co-self-seeding strategy in the preparation of fiber-like comicelles containing a heterogeneous & pi;-conjugated core is limited owing to very rare reports associated to this recently emerging strategy. Herein, we report that polydisperse comicelles containing a heterogeneous OPE9/OPV5 (OPE = oligo(p-phenylene ethynylene), OPV = oligo(p-phenylene vinylene), the subscripts indicate the exact number of repeat unit of OPE and OPV segments) core can be formed from the mixture of OPE9-b-P2VP56 and OPV5-b-PNIPAM47 (P2VP = poly(2-vinylpyridine), PNIPAM = poly(N-iso-propylacrylamide), the subscripts denote the degree of polymerization) with different mass ratios of OPE9-b- P2VP56 to OPV5-b-PNIPAM47 (MOPE9/MOPV5) by crystallization-driven co-self-assembly via heating/cooling protocol. Subsequently, by co-self-seeding from the seed comicelles obtained by the fragmentation of as-prepared polydisperse comicelles, apparent continuous (gradient) and segmented (block) fiber-like comicelles containing a heterogeneous OPE9/OPV5 core of controlled length/composition/morphology can be generated with varying annealing temperature and MOPE9/MOPV5. Co-self-seeding from pairs of separated seed micelles of OPE9-b-P2VP56 and OPV5-b-PNIPAM47 with different MOPE9/MOPV5 also can give apparently continuous and segmented fiber-like comicelles containing a heterogeneous OPE9/OPV5 core. These two co-self-seeding approaches have some common and different characteristics. It is found that for these samples with the MOPE9/MOPV5 = 1/1 and 2/1, the Ln of comicelles obtained from seed comicelles showed much sharper increase with the increase of temperature relative to the Ln of comicelles generated from mixed seed micelles as the temperatures were above 70 degrees C. On the contrary, for the MOPE9/MOPV5 = 5/1, both sets of samples showed very similar trend of dependence of Ln of resulting comicelles on the annealing temperature. These results revealed that both packing modes and mass ratios (MOPE9/MOPV5) of seed (co)micelles affected the co-self-seeding behavior.