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Evaluation of EVA–PVAc blend behavior by 1-D and 2-D solid-state NMR

✍ Scribed by Cláudia M. G. De Souza; Carlos R. Pacheco; Maria I. B. Tavares

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
173 KB
Volume
73
Category
Article
ISSN
0021-8995

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✦ Synopsis

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 ). The miscibility between polymer chains was also studied by two-dimensional 1 H-13 C shift correlation (HETCOR).

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