Photoinduced Upgrading of Lactic Acid-Based Solvents to Block Copolymer Surfactants
Photoinduced Upgrading of Lactic Acid-Based Solvents to Block Copolymer Surfactants
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DOI：
10.1021/acssuschemeng.9b06599
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发表时间：
2020-01-20
影响因子：
8.4
通讯作者：
Lligadas, Gerard
中科院分区：
文献类型：
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作者：
Bensabeh, Nabil;Moreno, Adrian;Lligadas, Gerard
我们报告了一种利用乳酸家族化学品开发嵌段共聚物表面活性剂的新策略。这项工作的一个特别独特的方面是使用绿色溶剂作为生物基平台化学品来生成明确的纳米结构形成材料。在此，乳酸乙酯（EL）和N,N-二甲基乳酰胺（DML）溶剂与丙烯酸酯基团的有效官能化产生的单体可以通过光诱导铜催化活性自由基聚合过程聚合，产生具有不同水溶性的聚合物材料。这些乳酸衍生单体被用作明确的二嵌段共聚物的主要成分，该二嵌段共聚物由聚（EL丙烯酸酯）和聚（DML丙烯酸酯）链段分别作为疏水性和亲水性结构单元组成。所得的两亲性共聚物可以在水溶液中自组装形成具有不同形态的纳米颗粒（例如大化合物胶束和囊泡）。随后，所形成的两亲性聚合物被用作甲基丙烯酸甲酯和苯乙烯的乳液聚合中的有效稳定剂，为合成100-200 nm范围内明确且稳定的聚合物乳胶提供了一种简便的方法，证明了这些生物基聚合物在纳米材料合成中的实际意义。
We report a new strategy toward the development of block copolymer surfactants from chemicals of the lactic acid family. A particularly unique aspect of this work is the use of green solvents as biobased platform chemicals to generate well-defined and nanostructure-forming materials. Herein, efficient functionalization of ethyl lactate (EL) and N,N-dimethyl lactamide (DML) solvents with acrylate groups generated monomers that could be polymerized by the photoinduced copper-catalyzed living radical polymerization process to yield polymeric materials with different water solubilities. These lactic acid-derived monomers were used as a major component in well-defined diblock copolymers composed of poly(EL acrylate) and poly(DML acrylate) segments as hydrophobic and hydrophilic building blocks, respectively. The resulting amphiphilic copolymers could self-assemble in aqueous solution to form nanoparticles with different morphologies (e.g., large-compound micelles and vesicles). Subsequently, the formed amphiphilic polymers were employed as efficient stabilizers in the emulsion polymerization of methyl methacrylate and styrene, offering a facile method for the synthesis of well-defined and stable polymer latexes in the range of 100-200 nm, demonstrating the practical significance of these biobased polymers in nanomaterial synthesis.