Pronounced poly(methyl methacrylate) dynamics induced by blending morphology

Abundant low-frequency motions in the poly(methyl methacrylate) (PMMA) phas e of polymer blends of poly(propylene oxide) epoxy and thermoplastic PMMA w ith submicron morphologies are revealed by solid-state NMR measurements. Th e presence of this mobility is in Line with the depression of glass tempera tures in thin polymer films. The modified polymer dynamics induced by micro scopic morphology is potentially important for research on frequency-depend ent polymer conductivity, dynamics in polymeric glasses, physical aging, an d models for polymer fracture dynamics.