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

BAYATI, SOLMAZ LU ; Bergquist, Karl-Erik LU ; Zhu, Kaizheng; Nyström, Bo; Pedersen, Jan Skov; Galantini, Luciano and Schillén, Karin LU (2017) In Journal of Polymer Science, Part B: Polymer Physics 55(19). p.1457-1470
Abstract
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,... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Polymer Science, Part B: Polymer Physics
volume
55
issue
19
pages
1457 - 1470
publisher
John Wiley & Sons
external identifiers
  • scopus:85027549871
  • wos:000407842600004
ISSN
0887-6266
DOI
10.1002/polb.24403
language
English
LU publication?
yes
id
a09023af-a025-4d15-bd2c-a775d7606f78
date added to LUP
2017-08-25 12:57:19
date last changed
2018-01-07 12:16:07
@article{a09023af-a025-4d15-bd2c-a775d7606f78,
  abstract     = {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.},
  author       = {BAYATI, SOLMAZ and Bergquist, Karl-Erik and Zhu, Kaizheng and Nyström, Bo and Pedersen, Jan Skov and Galantini, Luciano and Schillén, Karin},
  issn         = {0887-6266},
  language     = {eng},
  month        = {07},
  number       = {19},
  pages        = {1457--1470},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Polymer Science, Part B: Polymer Physics},
  title        = {Mixed micelles of oppositely charged poly(N-isopropylacrylamide) diblock copolymers},
  url          = {http://dx.doi.org/10.1002/polb.24403},
  volume       = {55},
  year         = {2017},
}