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- Title
Inhomogeneities in PNIPAM Aqueous Solutions: The Inside View by Spin Probe EPR Spectroscopy.
- Authors
Zubanova, Ekaterina M.; Kostjuk, Sergei V.; Timashev, Peter S.; Rochev, Yury A.; Kokorin, Alexander I.; Melnikov, Mikhail Ya.; Golubeva, Elena N.
- Abstract
Coil to globule transition in poly(N-isopropylacrylamide) aqueous solutions was studied using spin probe continuous-wave electronic paramagnetic resonance (CW EPR) spectroscopy with an amphiphilic TEMPO radical as a guest molecule. Using Cu(II) ions as the "quencher" for fast-moving radicals in the liquid phase allowed obtaining the individual spectra of TEMPO radicals in polymer globule and observing inhomogeneities in solutions before globule collapsing. EPR spectra simulations confirm the formation of molten globules at the first step with further collapsing and water molecules coming out of the globule, making it denser.
- Subjects
ELECTRON paramagnetic resonance spectroscopy; AQUEOUS solutions; PARAMAGNETIC resonance; THERMORESPONSIVE polymers
- Publication
Polymers (20734360), 2021, Vol 13, Issue 21, p3829
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym13213829