中文标题：采用定制合成的具有聚氨酯主链的双刷型共聚物为乳化剂制备油包离子液体乳液
英文标题：Amphiphilic Double-Brush Copolymers with a Polyurethane Backbone: A Bespoke Macromolecular Emulsifier for Ionic Liquid-in-Oil Emulsion
刊物名称及期号、页码：Langmuir 2021, 10.1021/acs.langmuir.0c03322
作者姓名（中文）： 高勇*、吴雄辉、向哲、齐陈泽
作者姓名（英文）：Yong Gao,* Xionghui Wu, Zhe Xiang, Chenze Qi
摘要（英文）：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 highstability of the [Bmim][PF6]-in-benzene emulsion.
工作简介：由于离子液体无毒、蒸气压低及溶解性好，离子液体包含的乳液在工业上具有重要应用。但离子液体与其它液体界面张力低，制备稳定的离子液体包含的乳液存在挑战。已有研究证实双刷型共聚物具有较高乳化性能。基于此，本工作组合聚加成和可控自由基聚合，合成了以PU为主链，PMMA和PDMA为支链的双刷型共聚物PU-g-PDMA/PMMA。以PU-g-PDMA/PMMA为乳化剂，可在较低乳化剂含量条件下制备出[Bmim][PF6]-in-benzene乳液。进一步研究显示PU-g-PDMA/PMMA乳化活性明显优于PU-g-PDMA, PU-g-PMMA及PDMA-b-PMMA。
创新点：借助双刷型共聚物PU-g-PDMA/PMMA的PDMA和PMMA支链之间热力学不相容性，促使吸附在两相界面的PU-g-PDMA/PMMA的两不同支链在两相择优分布。PU-g-PDMA/PMMA以Janus构象吸附在两相界面，提高了乳液稳定性。
全文链接：https://dx.doi.org/10.1021/acs.langmuir.0c03322
