Abstract
Diffuse-reflection near-infrared absorption spectra of water adsorbed on various fabrics (cotton, linen, rayon, silk, wool, polyester, nylon, and polyacrylonitrile) were obtained by calculating difference spectra of the fabrics before and after drying with a thermostatic hot-air oven. Peak wavenumbers, widths, shapes, and intensities of the bands due to the water were found to depend on the kind of fabric. The dependence is presumably caused by the difference of the amount of water and of the interaction between the water and fiber molecules. Linear regres-sion lines were obtained for the relations between the amount of water measured as the weight and the peak intensity of the water band around 5140 cm-1. Quantitative analysis of water content of fabrics was found to be possible.
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