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

SOLMAZ BAYATI, Karl-Erik Bergquist, Kaizheng Zhu, Bo Nyström, Jan Skov Pedersen, Luciano Galantini, Karin Schillén

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

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 1H 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 1H 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.
Originalspråkengelska
Sidor (från-till)1457-1470
TidskriftJournal of Polymer Science, Part B: Polymer Physics
Volym55
Nummer19
DOI
StatusPublished - 2017 juli 24

Ämnesklassifikation (UKÄ)

  • Polymerkemi

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