Micelles and 'reverse micelles' with a novel water-soluble diblock copolymer

BÜTÜN V., Sonmez S., YARLIGAN UYSAL S., Taktak F. F., Atay A., BÜTÜN ŞENGEL S.

POLYMER, vol.49, no.19, pp.4057-4065, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49 Issue: 19
  • Publication Date: 2008
  • Doi Number: 10.1016/j.polymer.2008.07.026
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4057-4065
  • Keywords: micelles, reverse micelles, water-soluble, HYDROPHILIC BLOCK-COPOLYMERS, AQUEOUS-SOLUTION PROPERTIES, SILICA/AQUEOUS SOLUTION INTERFACE, AGGREGATION BEHAVIOR, MICELLIZATION, POLYMERIZATION, SURFACTANTS, ADSORPTION, POLYMERS, KINETICS
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

A series of poly[2-(diisopropylamino)ethyl methacrylate]-block-poly[2-(N-morpholino)ethyl methacrylate], IPDPA-b-PMEMA], have been synthesized by using group transfer polymerization. These novel PDPA-b-PMEMA diblock copolymers dissolved molecularly in aqueous solution at low pH (<6.0) due to the protonation of all tertiary amine residues of both blocks and formed PDPA-core micelles at pH 7.5 by PMEMA block forming the micelle coronas. On the other hand, it was also observed that these diblock copolymers formed near-monodisperse 'reverse micelles', PMEMA-core micelles, in n-alkanes with or without requiring cosolvent depending on comonomer ratios. Dynamic light scattering studies indicated monodisperse or near-monodisperse micelles in both cases. The intensity-average radii of the PDPA-core and the PMEMA-core micelles were between 10 nm and 17 nm (polydispersity index, mu(2)/Gamma(2) < 0.08) and between 10 nm and 13 nm in n-hexane (mu(2)/Gamma(2) < 0.09), respectively. (C) 2008 Elsevier Ltd. All rights reserved.