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Structural control in micelles of alkyl acrylate-acrylate copolymers via alkyl chain length and block length
Colloid and Polymer Science ( IF 2.4 ) Pub Date : 2020-06-02 , DOI: 10.1007/s00396-020-04663-y
Özge Azeri , Dennis Schönfeld , Laurence Noirez , Michael Gradzielski

Amphiphilic copolymers with poly (alkyl acrylate) as hydrophobic and poly (acrylic acid) (AA) as hydrophilic block have been synthesised. The alkyl chain was varied from butyl to dodecyl, thereby varying systematically the polarity of the hydrophobic block whose length was between 35 and 70, while the PAA block had ~ 100 units. Such relatively short amphiphiles should equilibrate quickly in aqueous solution, and their corresponding self-assembly properties were characterised by means of critical micelle concentration (cmc) determination. Detailed information regarding the aggregate structures was obtained by static light scattering (SLS) and small angle neutron scattering (SANS). This could be correlated with the molecular architecture of the copolymers and the degree of ionisation of the PAA block. Generally, it is found that the aggregation numbers become smaller upon fully charging the PAA head group and only for dodecyl acrylate really well-defined micellar aggregates are formed. This means that the extent of hydrophobicity of the alkyl acrylate block and its length determine in a clear fashion the propensity for micelle formation and the mass and aggregation number of the formed micelles. Graphical abstract

中文翻译:

通过烷基链长和嵌段长度控制丙烯酸烷基酯-丙烯酸酯共聚物胶束的结构

已经合成了以聚(丙烯酸烷基酯)作为疏水性和聚(丙烯酸)(AA)作为亲水性嵌段的两亲共聚物。烷基链从丁基到十二烷基不等,从而系统地改变长度在 35 到 70 之间的疏水嵌段的极性,而 PAA 嵌段具有约 100 个单元。这种相对较短的两亲物应该在水溶液中迅速平衡,它们相应的自组装特性通过临界胶束浓度 (cmc) 测定来表征。通过静态光散射 (SLS) 和小角中子散射 (SANS) 获得有关聚集体结构的详细信息。这可能与共聚物的分子结构和 PAA 嵌段的电离度有关。一般来说,发现在 PAA 头基完全充电后,聚集数变小,并且仅对于丙烯酸十二烷基酯形成真正明确的胶束聚集体。这意味着丙烯酸烷基酯嵌段的疏水性程度及其长度以明确的方式决定了胶束形成的倾向以及形成的胶束的质量和聚集数。图形概要
更新日期:2020-06-02
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