AI Article Synopsis
- The study investigates the transition of poly(N-isopropylacrylamide) from a coil to a globule state using spin probe EPR spectroscopy with a special TEMPO radical.
- Cu(II) ions were used as a quenching agent to analyze the TEMPO radical's behavior in both the globule and the pre-collapse states of the polymer.
- EPR spectrum simulations indicate that initially, molten globules form, which then collapse further, causing density increases as water molecules are expelled.
Article 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588346 | PMC |
| http://dx.doi.org/10.3390/polym13213829 | DOI Listing |
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