Proton nuclear magnetic relaxation study in a polyalkyleneoxide polymer

Proton magnetic relaxation measurements at 90 MHz over a temperature range between 223 K and 403 K in a new polymer (poly)-propyleneoxide-ethyleneoxide-spirooxazolidine yielded a glass transition point of 247 K and the correlation time of the motion of the molecular chain of 1.08 x 10-9 s at 228 K as deduced from the minimum in the T1 curve. The activation energy of this motion was found to be 5 kcal. mol.-1. (author)