Abstract
The behavior of water coordinated with the surface of several kinds of Nylon was investigated by high resolution NMR measurements. The half-width of water signal became narrower in proportion to an increase in the amount of water added, and its chemical shift changed for the lower magnetic field. The change of the half-width in proportion to the change of the amount of water well consisted with the change of the chemical shift. The chemical shift of water on each Nylon in case the amount of water was extrapolated zero was as mentioned below:
Nylon 4 was -1.8 ppm, Nylon 6 was -1.85 ppm, Nylon 66 was -1.9 ppm, Nylon 610 was -2.1 PPm and Nylon 12 was -2.1 ppm, where acetone was used as the exterior standard.
These results suggested that the larger the number of carbon atom per acid-amide-bond became, the weaker the coordination of water with the Nylon became.
Similar results were obtained when the 0.5N NaCl aqueous solution was added to the Nylon, but its coordination with the Nylon was a little weaker than that of pure water with the Nylon.
