pH-Driven Morphological Diversity in Poly[n-Butyl Acrylate-block-(2-(Dimethylamino)Ethyl Acrylate)] Amphiphilic Copolymer Solutions.,Macromolecular Rapid Communications

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pH-Driven Morphological Diversity in Poly[n-Butyl Acrylate-block-(2-(Dimethylamino)Ethyl Acrylate)] Amphiphilic Copolymer Solutions.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2019-11-10 , DOI: 10.1002/marc.201900477
Angeliki Chroni ₁ , Stergios Pispas ₁ , Aleksander Forys ₂ , Barbara Trzebicka ₂

Affiliation

Amphiphilic poly[n-butyl acrylate-block-(2-(dimethylamino)ethyl acrylate)] (PnBA-b-PDMAEA) block copolymers are synthesized by the reversible addition fragmentation chain transfer polymerization process. The pH-responsive self-assembly behavior in aqueous media is studied by dynamic, static, and electrophoretic light scattering and cryogenic transmission electron microscopy (Cryo-TEM) at different pHs. In particular, the PnBA40 -b-PDMAEA60 copolymer (where subscripts denote %wt composition of the components) shows remarkable morphological transitions in aqueous solutions of varying pH values forming, among others, an unusual and novel hierarchical vesicular morphology, as indicated by Cryo-TEM results. The observed transitions are attributed to synergistic effects involving alterations of the protonation degree of the PDMAEA block, in conjunction with the specific composition of the copolymer and the softness of PnBA blocks, with cumulative drive changes in the packing parameter of the copolymer system and result in the formation of various unexpected morphologies by simple pH changes.

中文翻译：

聚[丙烯酸正丁酯嵌段-（2-（二甲基氨基）乙基丙烯酸酯）]两亲共聚物溶液中pH驱动的形态多样性。

两性聚[丙烯酸正丁酯嵌段-（丙烯酸2-（二甲氨基）乙酯）]（PnBA-b-PDMAEA）嵌段共聚物是通过可逆加成断裂链转移聚合工艺合成的。通过动态，静态和电泳光散射以及低温透射电子显微镜（Cryo-TEM）研究了在不同pH值下水性介质中pH响应的自组装行为。尤其是，PnBA40 -b-PDMAEA60共聚物（下标表示组分的重量百分比）在不同pH值的水溶液中表现出显着的形态学转变，尤其是形成了不寻常且新颖的分层囊泡形态，如Cryo- TEM结果。观察到的过渡归因于协同效应，涉及PDMAEA嵌段的质子化程度的改变，

更新日期：2019-11-11

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