Abstract
An ESR study of poly(L-leucine)-benzene solution ranging in concentration from 0.1 to 6.0 wt% was carried out by spin-labeling technique in the temperature range from room temperature to 90°C. The ESR spectra of these samples showed that radicals undergo restricted motion in this temperature range. It was found that the line separation of the ESR spectrum changes remarkably around 50 and 70°C. These temperatures correspond to the temperatures of the gel-sol transitions, suggesting the existence of two kinds of gel states in these samples. Heats of dissociation of these gels were estimated at 160 and 42 kcal for a mol of network junctions, respectively, for the poly(L-leucine) with a number-average molecular weight of 10.4
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Anada, Y., Tsutsumi, A., Hideshima, T. et al. ESR Study of Gel-Sol Transitions of Poly(L-leucine)-Benzene Solution by Spin-Labeling Technique. Polym J 19, 939–943 (1987). https://doi.org/10.1295/polymj.19.939
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DOI: https://doi.org/10.1295/polymj.19.939