Carbon and proton nuclear magnetic resonance measurements have been applied to the poly(vinyl acetate) system in the presence and absence of water. Proton magnetic relaxation dispersion measurements from 0.01 to 30 MHz demonstrate a low-frequency dispersion that indicates a distribution of low-frequency motions that drive the proton magnetic relaxation. The static carbon spectra demonstrate that the carboxyl side-chain region of the polymer is largely unaffected by the addition of water. However, there are dramatic changes in the carbon spin-lattice relaxation rates when the polymer is hydrated. In the presence of water the carbon spin-lattice relaxation is dominated by the high-frequency motion of the water molecules, but carbon relaxation and proton relaxation in the rotating frame are controlled by slower polymer motions of sufficiently small amplitude that the carboxyl carbon chemical shift tensor is largely unaffected.
|Original language||English (US)|
|Number of pages||9|
|Publication status||Published - 1986|
ASJC Scopus subject areas
- Materials Chemistry