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PH-Driven Morphological Diversity in Poly[n-Butyl Acrylate-block- (2- (Dimethylamino) Ethyl Acrylate) ] Amphiphilic Copolymer Solutions

Chroni, A.; Pispas, S.; Forys, A.; Trzebicka, B.

Macromolecular Rapid Communications 40(24): E1900477

2019

ISSN/ISBN: 1521-3927
PMID: 31709675
DOI: 10.1002/marc.201900477
Accession: 069502660
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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.

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