Sorption and diffusion of water vapor by nylon 6

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Abstract
The interaction between nylon 6 and water has been studied from water vapor sorption isotherms, diffusion of water vapor in the polymer, and nuclear magnetic resonance (NMR) properties. The variations in water sorption properties of various heat treated specimens seem to result from the difference in the degree of loose packing in the amorphous regions. From the effect of water vapor on NMR narrow line intensity, it has been found that there are two characteristic sorption types of water vapor in nylon 6, that is, water molecule is comparatively immobile at the lower water content, and considerably mobile at water contents above 4 wt.‐%. Furthermore, it may be supposed that there is in addition another sorption state of water vapor below 2 wt.‐% that corresponds to the monolayer capacity of water vapor in the polymer.

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