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首页> 外文期刊>RSC Advances >Precise synthesis of amphiphilic diblock copolymers consisting of various ionic liquid-type segments and their influence on physical gelation behavior in water
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Precise synthesis of amphiphilic diblock copolymers consisting of various ionic liquid-type segments and their influence on physical gelation behavior in water

机译：精确合成两性离子液体型区段组成的两亲型二嵌段共聚物及其对水中物理胶凝行为的影响

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摘要

Appropriately designed amphiphilic diblock vinyl ether (VE) copolymers consisting of an ionic liquid-type segment and a hydrophobic segment were demonstrated to undergo physical gelation in water at extremely low concentrations. The precursor diblock copolymers were synthesized by the living cationic polymerization of 2-chloroethyl VE with a hydrophobic VE through an appropriately designed initiating system such as optimized temperature and catalyst. A relatively high temperature such as 20 °C was important for controlled polymerization of octadecyl VE. Ionic liquid moieties with imidazolium salt structures were subsequently introduced into the side chains of the diblock copolymers via chemical modifications of the 2-chloroethyl groups. The physical gelation behavior of the obtained diblock copolymers was examined in water, with a particular focus on the influence of the hydrophobic VEs, the hydrophilicity of the counteranions and the substituents on the ionic liquid-type segments, and the length of each segment. Based on this systematic investigation, physical gelation at concentrations as low as 0.2 wt% was achieved with diblock copolymers with a suitable balance of these factors.
机译：适当设计的两亲二嵌段乙烯基醚（Ve）由离子液体型链段和疏水区段组成的共聚物，以在极低浓度下在水中进行物理凝胶化。通过适当设计的启动系统，通过适当设计的温度和催化剂，通过2-氯乙基Ve的活阳离子聚合来合成前体二嵌段共聚物。诸如20℃的相对高的温度对于十八烷基ve的受控聚合是重要的。随后通过2-氯乙基的化学改性将具有咪唑盐结构的离子液体部分引入二嵌段共聚物的侧链中。在水中检测所得二嵌段共聚物的物理凝胶化行为，特别侧重于疏水性VES的影响，抗衡离子的亲水性和离子液体型段上的取代基，以及每个区段的长度。基于该系统研究，用二嵌段共聚物实现低至0.2wt％的浓度低至0.2wt％的物理凝胶化，具有适当的这些因素的平衡。

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