Amphiphilic Double-Brush Copolymers with a Polyurethane Backbone: A Bespoke Macromolecular Emulsifier for Ionic Liquid-in-Oil Emulsion,Langmuir

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Amphiphilic Double-Brush Copolymers with a Polyurethane Backbone: A Bespoke Macromolecular Emulsifier for Ionic Liquid-in-Oil Emulsion
Langmuir ( IF 3.7 ) Pub Date : 2021-02-07 , DOI: 10.1021/acs.langmuir.0c03322
Yong Gao _{1,

2} , Xionghui Wu ₂ , Zhe Xiang ₂ , Chenze Qi ₁

Affiliation

The study on ionic liquid (IL)-based emulsions is very interesting due to the “green” quality and potential wide applications of ILs, whereas the emulsifiers for the formation of IL-based emulsions are extremely limited and mainly centered on low molecular weight surfactants. In this work, synthesis of amphiphilic double-brush copolymers (DBCs) and their application as bespoke macromolecular emulsifiers for the formation of IL-containing non-aqueous emulsions are described. DBCs consisted of a polyurethane (PU) backbone and poly(N,N-dimethyl acrylamide) (PDMA) and poly(methyl methacrylate) (PMMA) chains that were grafted simultaneously at the same reactive site along the PU backbone (PU-g-PDMA/PMMA), which were synthesized through the combination of polyaddition and the reversible-deactivation radical polymerization reactions. Highly stable [Bmim][PF₆]-in-benzene emulsions could be gained by adopting PU-g-PDMA/PMMA DBCs as macromolecular emulsifiers at a low content, such as 0.025 wt %. On the basis of the stability and the size of emulsion droplets, PU-g-PDMA/PMMA DBCs exhibited much better emulsifying performances than their analogues, including PU-g-PDMA, PU-g-PMMA, and PDMA-b-PMMA copolymers. Such excellent emulsifying performances of PU-g-PDMA/PMMA DBCs were due to high interfacial activities. PU-g-PDMA/PMMA DBCs exhibited higher capabilities in lowering the interfacial tension of the [Bmim][PF₆]–benzene interface than their analogues. A large energy barrier to desorption of adsorbed PU-g-PDMA/PMMA DBCs from the interface contributed to high stability of the [Bmim][PF₆]-in-benzene emulsion.

中文翻译：

两亲性双刷与聚氨酯骨架的共聚物：定制的离子型油包水型乳液高分子乳化剂

由于离子液体（IL）的“绿色”品质和潜在的IL广泛应用，基于离子液体（IL）的乳液的研究非常有趣，而用于形成基于IL的乳液的乳化剂却非常有限，并且主要集中在低分子量表面活性剂上。在这项工作中，描述了两亲性双刷共聚物（DBCs）的合成及其作为定制大分子乳化剂用于形成含IL非水乳液的应用。DBC由聚氨酯（PU）骨架和聚（N，N-二甲基丙烯酰胺）（PDMA）和聚（甲基丙烯酸甲酯）（PMMA）链组成，它们沿着PU骨架（PU- g）在相同的反应位点同时接枝-PDMA / PMMA），这是通过加聚和可逆失活自由基聚合反应的组合而合成的。通过采用低含量（例如0.025 wt％）的PU- g -PDMA / PMMA DBCs作为高分子乳化剂，可以获得高稳定性的[Bmim] [PF ₆ ]-苯乳液。在稳定的基础和乳液液滴的尺寸，PU-克-PDMA / PMMA表现出DBCS好得多乳化性能比它们的类似物，包括PU-克-PDMA，PU-克-PMMA，和PDMA- b -PMMA共聚物。PU- g -PDMA / PMMA DBC如此出色的乳化性能归因于高界面活性。PU- g ^-PDMA / PMMA DBC比类似物具有更高的降低[Bmim] [PF ₆ ]-苯界面张力的能力。从界面上解吸吸附的PU- g -PDMA / PMMA DBC的较大能量壁垒有助于[Bmim] [PF ₆ ]-苯乳液的高稳定性。

更新日期：2021-02-23

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