Abstract
A spin label (4-amino-2,2,6,6-tetramethylpiperidine 1-oxide, TEMPO) and a fluorescence dye (1-pyrenulbutyl,Py) were attached randomly along the same poly(N-isopropylacrylamide) chain (PNIPAM-Py-T, M v 2.3×10 6 , Py content 1.9×10 -5 mol g -1 ), and their interactions in solutions of the polymer were studied using electron paramagnetic resonance (EPR), 13 C nuclear magnetic resonance ( 13 C NMR), and fluorescence spectroscopy. The thermoreversible phase transition of aqueous solutions of the polymer was examined by these three techniques
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