Nuclear magnetic resonance relaxation-time measurements performed on poly (ethylene oxide)-deuteriated poly(methyl methacrylate) blends of low-molecular-weight components were analysed as functions of concentration and temperature T. A number of results can be derived from the homogeneity properties of the transverse relaxation functions Mx(t, ~, T). The temperature dependence of poly(ethylene oxide) proton relaxation times in the blend is found to obey a Williams-Landel-Ferry equation with a temperature reference T*(~) = Tg((I~) q- 50 K, Tg(~) being the glass transition temperature of the blend. It is shown that the transverse magnetization dynamics is concentration-independent at the reference temperature T*(?). The dependence of transverse relaxation upon temperature and poly(ethylene oxide) molecular weight provides qualitative information about the terminal relaxation spectrum
Посилання на статтю:
Nuclear magnetic resonance approach to properties of poly(ethylene oxide)- poly (methyl methacrylate) blends: 1. Chain dynamics and free volume / C. Brosseau*, A. Guillermo and J. P. Cohen-Addad // Polymer. – 1992. – Vol 33. – P. 2076-2083.