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Two Types of Block Copolymer Micelles with Ion-Containing Cores

✍ Scribed by Irem Erel; Zhichen Zhu; Svetlana Sukhishvili; Elena Patyukova; Igor Potemkin; Elena Kramarenko

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
439 KB
Volume
31
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

We report a combined experimental and theoretical study of micellization of block copolymer with hydrophilic nonionic corona‐forming blocks and weak polyelectrolyte (wPE) core‐forming blocks with pH‐triggered solubility in aqueous solutions. We demonstrate that in addition to micelles with neutral cores, there exist two other types of micelles with PE‐ or ionomer‐like cores, in which monovalent counterions are released or condensed on core wPE block, respectively. The transition between the two types of micelles occurred upon changes in ionization of the PE core block and resulted in nonmonotonous changes of aggregation number as a function of pH. Such micelles with stimulus responsive cores represent promising nanocarriers for controlled delivery applications.

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