Charge selective encapsulation by polymeric micelles with cationic, anionic, or zwitterionic cores
Charge selective encapsulation by polymeric micelles with cationic, anionic, or zwitterionic cores
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DOI：
10.1002/pola.25900
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
Decheng Wan;M. Jin;H. Pu;Guowei Wang
中科院分区：
文献类型：
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作者：
Decheng Wan;M. Jin;H. Pu;Guowei Wang
报道了具有电荷选择性和pH可逆性的聚合物胶束。研究发现，以聚苯乙烯(PS)为壳，以超支化聚乙烯亚胺(PEI)为核的单分子胶束(PEI@PS)对阴离子染料具有排他性包埋作用；由刷状大分子(MPS-PAA)与多个PS-b-聚丙烯酸(PAA)接枝而成的物理胶束(MPS-PAA)对阳离子染料具有排他性包埋作用。带有两性离子核的共价胶束(PEI-COOH@PS)，即与稠密的羧酸共价衍生的PEI，可以进行高度pH可切换的电荷选择和pH可逆的包覆。PEI@PS和MPS-PAA均可用于离子染料的高电荷选择性分离，但其pH可逆性相对有限。相比之下，PEI-COOH@PS在区分阴阳离子染料方面效果较差，但可很好地回收利用。由PEI和MPS-PAA自组装得到的物理胶束具有与PEI-COOH@PS相似的性质。这些胶束在混合物分离中的结合可以提高胶束的可回收性，拓宽可以很好分离的混合物的光谱。2012 Wiley期刊公司J Polym Sci Part A：Polym Chem，2012
Polymeric micelles showing charge selective and pH-reversible encapsulation are reported. It is found that for a guest mixture of organic cationic–anionic dyes, a unimolecular micelle (PEI@PS) with a polystyrene (PS) as shell and a hyperbranched polyethylenimine (PEI) as core can exclusively entrap the anionic one; and a physical micelle consisting of brush-like macromolecule (mPS-PAA) with multi PS-b-polyacrylic acid (PAA) as grafts can exclusively entrap the cationic one. A covalent micelle (PEI-COOH@PS) bearing a zwitterionic core, that is, PEI covalently derived with dense carboxylic acids, can undergo highly pH-switchable charge selective and pH-reversible encapsulation. Both PEI@PS and mPS-PAA can be used for highly charge-selective separation of ionic dyes but the pH-reversibility of the encapsulation is relatively limited. In contrast, PEI-COOH@PS is less effective to differentiate the anionic–cationic dyes but is well recyclable. A physical micelle obtained from the self-assembly of PEI and mPS-PAA shows similar property to PEI-COOH@PS. The combination of these micelles in mixture separation can enhance the recyclability of the micelle and widen the spectrum of mixtures that can be well separated. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012