Mixed micelles of oppositely charged poly(N-isopropylacrylamide) diblock copolymers

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DOI

  • Solmaz Bayati, Lund university
  • ,
  • Karl-Erik Bergquist, Lund university
  • ,
  • Kaizheng Zhu, University of Oslo, Oslo
  • ,
  • Bo Nystrom, University of Oslo, Oslo
  • ,
  • Jan Skov Pedersen
  • Luciano Galantini, Sapienza University of Rome
  • ,
  • Karin Schillen, Lund university

Mixed micelle formation between two oppositely charged diblock copolymers that have a common thermosensitive nonionic block of poly(N-isopropylacrylamide) (PNIPAAM) has been studied. The block copolymer mixed solutions were investigated under equimolar charge conditions as a function of both temperature and total polymer concentrations by turbidimetry, differential scanning calorimetry, two-dimensional proton nuclear magnetic nuclear Overhauser effect spectroscopy (2D H-1 NMR NOESY), dynamic light scattering, and small angle X-ray scattering measurements. Well-defined and electroneutral cylindrical micelles were formed with a radius and a length of about 3 nm and 35 nm, respectively. In the micelles, the charged blocks built up a core, which was surrounded by a corona of PNIPAAM chains. The 2D H-1 NMR NOESY experiments showed that a minor block mixing occurred between the core blocks and the PNIPAAM blocks. By approaching the lower critical solution temperature of PNIPAAM, the PNIPAAM chains collapsed, which induced aggregation of the micelles. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1457-1469

Original languageEnglish
JournalJournal of Polymer Science. Part B, Polymer Physics
Volume55
Issue19
Pages (from-to)1457-1469
Number of pages13
ISSN0887-6266
DOIs
Publication statusPublished - 1 Oct 2017

    Research areas

  • diblock copolymers, oppositely charged, poly(N-isopropylacrylamide), micelles, self-organization, X-RAY-SCATTERING, DYNAMIC LIGHT-SCATTERING, COACERVATE CORE MICELLES, BLOCK IONOMER COMPLEXES, COIL-TO-GLOBULE, PHASE-TRANSITION, AQUEOUS-SOLUTION, POLYMER-SOLUTIONS, THERMAL RESPONSE, ANIONIC POLYELECTROLYTE

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