N. Parizel et al., NMR AND DSC INVESTIGATIONS OF THE MISCIBILITY OF POLY(METHYL METHACRYLATE) POLY(ETHYLENE OXIDE) BLENDS/, Polymer, 38(15), 1997, pp. 3719-3725
H-1 spin-lattice relaxation times in the rotating frame and free induc
tion decays were measured on poly(methyl methacrylate)/poly(ethylene o
xide) blends over the whole composition range. In these systems, in wh
ich one component is an amorphous polymer and the other one can crysta
llize, experiments combining both H-1 and C-13 n.m.r. spectroscopies a
llowed the determination of the composition of each phase. Results thu
s obtained led to the conclusion that phase separation occurs during t
he freeze-drying step. Therefore, poly(ethylene oxide) crystallization
takes place in a poly(ethylene oxide) rich phase. (C) 1997 Elsevier S
cience Ltd.