通过竞争氢键强度从嵌段共聚物混合物中形成分级自组装结构。

Hierarchical Self-Assembled Structures from Diblock Copolymer Mixtures by Competitive Hydrogen Bonding Strength.

机构信息

Department of Materials and Optoelectronic Science, Center for Functional Polymers and Supramolecular Materials, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.

Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80424, Taiwan.

出版信息

Molecules. 2018 Sep 3;23(9):2242. doi: 10.3390/molecules23092242.

DOI:10.3390/molecules23092242

PMID:30177633

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6225209/

Abstract

In this work we prepared poly(styrene⁻⁻vinylphenol) (PS--PVPh) by sequential anionic living polymerization and poly(ethylene oxide--4-vinylpyridine) (PEO--P4VP) by reversible addition fragmentation chain transfer polymerization (RAFT) by using poly(ethylene oxide) 4-cyano-4-(phenylcarbonothioylthio)pentanoate (PEO-SC(S)Ph) as a macroinitiator with two hydrogen bonded acceptor groups. When blending with disordered PEO--P4VP diblock copolymer, we found the order-order self-assembled structure transition from lamellar structure for pure PS--PVPh to cylindrical, worm-like, and finally to PEO crystalline lamellar structures. Taking the advantage of the Δ effect from competitive hydrogen bonding strengths between PVPh/P4VP and PVPh/PEO domains, it could form the hierarchical self-assembled morphologies such as core⁻shell cylindrical nanostructure.

摘要

在这项工作中，我们通过顺序阴离子活态聚合制备了聚苯乙烯⁻⁻聚(乙烯基苯酚)（PS--PVPh），通过可逆加成断裂链转移聚合（RAFT）制备了聚（氧化乙烯）4-氰基-4-（苯甲酰硫基）戊酸酯（PEO-SC（S）Ph）作为大分子引发剂的聚氧化乙烯-4-乙烯基吡啶（PEO--P4VP）。当与无规 PEO--P4VP 嵌段共聚物共混时，我们发现从纯 PS--PVPh 的层状结构到圆柱状、蠕虫状，最终到 PEO 结晶层状结构的有序-无序自组装结构转变。利用 PVPh/P4VP 和 PVPh/PEO 域之间竞争氢键强度的 Δ 效应，可以形成核壳圆柱纳米结构等分级自组装形态。