Abstract
1H spin-lattice relaxation times in the rotating frame and free induction decays were measured on poly(methyl methacrylate)/poly(ethylene oxide) blends over the whole composition range. In these systems, in which one component is an amorphous polymer and the other one can crystallize, experiments combining both 1H and 13C n.m.r. spectroscopies allowed the determination of the composition of each phase. Results thus obtained led to the conclusion that phase separation occurs during the freeze-drying step. Therefore, poly(ethylene oxide) crystallization takes place in a poly(ethylene oxide) rich phase.
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