Proton and deuterium spin–lattice relaxation times (T 1), spin–spin relaxation times (T 2), and rotating frame spin–lattice relaxation times (T 1r) and Fluorine T 1 and T 2 were measured as a function of hydration and temperature in hydrated Nafion. The proton and deuterium data display an apparent dynamical transition which we have attributed to a change in the degree of order within the aqueous phase. The temperature at which this transition occurs, T t, is a function of the level of hydration, increasing for decreasing hydration. Above T t, the relaxation processes are similar to those observed in bulk water.
Посилання на статтю:
An n.m.r. investigation of the dynamical characteristics of water absorbed in Nafion / Bryce MacMillan, Allan R. Sharp, Robin L. Armstrong // Polymer. – 1999. – N 40. – P. 2471–2480.