Abstract
The interaction of moisture with nylon 6 was investigated using an FT-IR spectroscopy over a near-infrared range of wavenumbers from 4500 to 8000 cm−1 to cover the first overtones of (2vCH) and (2vNH) as well as the water sensitive 5100 and 6900 cm−1 bands, a combination of (δOH)+(vasOH) and a combination of (vsOH)+(vasOH), respectively. Two types of differential procedures were performed to separate the contribution of the water sensitive bands from the entire spectrum: i.e., subtracting the spectrum of the test specimen conditioned at dryness of 0% relative humidity from that conditioned at a given relative humidity of x% (procedure A) or the spectrum for x% from that for (x+Δx)% (procedure B), both as functions of the given relative humidity of x%. From the areas of the water sensitive bands thus separated, the moisture sorption isotherm could be composed in fairly good agreement with that obtained by a gravimetric method. The 6900 cm−1 band of bulk water as well as those in the differential spectra, were decomposed into three components of a Lorentzian function, sub-band I, I-II, and II in the order of descending wavenumber. They were attributed to three kinds of water species differing in the degree of hydrogen-bonding covering singly to doubly hydrogen-bonded water (ice-like water) species. It was found that the water species, which more strongly interact with each other, also more strongly interact with the water accessible sites of nylon 6 to form fewer number of layers of adsorption in the sense of B.E.T.’s multilayer adsorption or the core portion of water cluster in the sense of Hill’s multimolecular adsorption. Semi-quantitative comparison was made between the characterization of the sorbed water by the B.E.T.’s multilayer adsorption and that by the present FT-IR spectroscopy.
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Fukuda, M., Miyagawa, M., Kawai, H. et al. Fundamental Studies on the Interactions between Moisture and Textiles V. FT-IR Study on the Moisture Sorption Isotherm of Nylon 6. Polym J 19, 785–804 (1987). https://doi.org/10.1295/polymj.19.785
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DOI: https://doi.org/10.1295/polymj.19.785
