Abstract
High-resolution solid-state 13C NMR spectra of (ethylene–vinyl alcohol) copolymers (EVOH) with various ethylene contents in the solid-state and their 13C spin-lattice relaxation times, T1, were measured, in order to elucidate the structure and dynamics of the copolymers. From these experimental results, the structural change of the EVOHs with changes of the ethylene content was successfully elucidated. Further, it is found that the 13C T1 for the CH carbon of the vinyl alcohol unit is mainly composed of two components. The fractions of short and long T1 components increase and decrease with an increase in the ethylene fraction, respectively. From these experimental results, it can be said that changes of the ethylene content in the copolymers lead to large changes in their structure and dynamics.
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