The influence of Fe2+ on the self-assembly of a bipyridine containing homopolymer: From bowl-shaped nanoparticles to vesicles

IF 5.8 2区 化学 Q1 POLYMER SCIENCE European Polymer Journal Pub Date : 2024-10-10 DOI:10.1016/j.eurpolymj.2024.113502
Yirong Fan, Tao Wang, Hui Sun
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Abstract

Metal ion coordination has critical influence on the self-assembly behavior of amphiphilic polymers and the morphology of the obtained assemblies. Herein, an amphiphilic homopolymer with 2,2′-bipyridine (BPy) as side chain is synthesized (noted as PBPyAA), which can self-assemble into bowl-shaped nanoparticles (BNPs) in tetrahydrofuran (THF)/water. Taking advantage of the coordination interaction between BPy and metal ions, Fe2+ is chosen to regulate the self-assembly behavior and the morphology of the assemblies of PBPyAA in two pathways. (Ⅰ) The aqueous solution of Fe2+ with various concentrations is added to the THF solution of PBPyAA during self-assembly. (Ⅱ) Fe2+ is added into the THF solution of PBPyAA before self-assembly, followed by the addition of deionized water to promote the self-assembly. The results show that the pathway Ⅰ facilitates the coordination of BPy and Fe2+. With the increase of the concentration of Fe2+ aqueous solution, the coordination efficiency of BPy increases from 0.419 % to 7.789 %, leading to the transformation of BNPs to vesicles. Though the coordination efficiency of BPy also increases with the concentration of Fe2+ in pathway Ⅱ, which is still quite low of 0.274 % to 0.366 %, and the morphology of the BNPs barely changes. In addition, ethylene diamine tetraacetic acid (EDTA), a strong chelating agent, is also added to promote the competitive complexation with BPy, resulting in the dissociation of BPy and Fe2+ and the reversible transformation from vesicles to BNPs. Overall, the effect of Fe2+ coordination on the self-assembly behavior of PBPyAA in two pathways is investigated and the reversible transformation of BNPs to vesicles is also achieved.

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Fe2+对含双吡啶均聚物自组装的影响:从碗状纳米颗粒到囊泡
金属离子配位对两亲性聚合物的自组装行为和所获得的组装体的形态具有重要影响。本文合成了一种以 2,2′-联吡啶(BPy)为侧链的两亲性均聚物(简称 PBPyAA),它能在四氢呋喃(THF)/水中自组装成碗状纳米颗粒(BNPs)。利用 BPy 与金属离子之间的配位相互作用,选择 Fe2+ 通过两种途径调节 PBPyAA 的自组装行为和组装体的形态。(Ⅰ)在自组装过程中向 PBPyAA 的 THF 溶液中加入不同浓度的 Fe2+ 水溶液。(Ⅱ) 在自组装前向 PBPyAA 的 THF 溶液中加入 Fe2+,然后加入去离子水促进自组装。结果表明,通路Ⅰ促进了 BPy 和 Fe2+ 的配位。随着 Fe2+ 水溶液浓度的增加,BPy 的配位效率从 0.419 % 增加到 7.789 %,从而导致 BNPs 转化为囊泡。虽然 BPy 的配位效率也随着通路Ⅱ中 Fe2+ 浓度的增加而增加,但仍然很低,仅为 0.274 % 至 0.366 %,而且 BNPs 的形态几乎没有变化。此外,还加入了强螯合剂乙二胺四乙酸(EDTA),以促进与 BPy 的竞争性络合,从而使 BPy 与 Fe2+ 解离,并从囊泡可逆地转变为 BNPs。总之,通过两种途径研究了 Fe2+ 配位对 PBPyAA 自组装行为的影响,并实现了 BNPs 向囊泡的可逆转化。
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来源期刊
European Polymer Journal
European Polymer Journal 化学-高分子科学
CiteScore
9.90
自引率
10.00%
发文量
691
审稿时长
23 days
期刊介绍: European Polymer Journal is dedicated to publishing work on fundamental and applied polymer chemistry and macromolecular materials. The journal covers all aspects of polymer synthesis, including polymerization mechanisms and chemical functional transformations, with a focus on novel polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine. The main scope is covered but not limited to the following core research areas: Polymer synthesis and functionalization • Novel synthetic routes for polymerization, functional modification, controlled/living polymerization and precision polymers. Stimuli-responsive polymers • Including shape memory and self-healing polymers. Supramolecular polymers and self-assembly • Molecular recognition and higher order polymer structures. Renewable and sustainable polymers • Bio-based, biodegradable and anti-microbial polymers and polymeric bio-nanocomposites. Polymers at interfaces and surfaces • Chemistry and engineering of surfaces with biological relevance, including patterning, antifouling polymers and polymers for membrane applications. Biomedical applications and nanomedicine • Polymers for regenerative medicine, drug delivery molecular release and gene therapy The scope of European Polymer Journal no longer includes Polymer Physics.
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