Evaluation of EVA-PVAc Blend Behavior by 1-D and 2-D Solid-State NMR

摘要

Ethylene-co-vinyl acetate and poly (vinyl acetate) blends were prepared in different proportions by melting in a HAAKE Rheomix mixer. The blends were prepared at a fixed temperature, rotation rate, and processing time. High-resolution solid-state nuclear magnetic resonance was chosen to characterize the blends with respect to structure-mobility-compatibility employing magic angle spinning with cross polarization and high-power hydrogen decoupling and the measurements of the proton spin-lattice relaxation time in the rotating frame (T_1~H#rho#). The miscibility between polymer chains was also studied by two-dimensional ~1H=~13C shift correlation (HETCOR).