Quantitative analysis of water combined with nitrile group, Combined H
2O, in acrylic fibers was investigated using infrared spectro-scopical technique, and a practical method was proposed. IR absorbance at 3630cm_??_ was selected as key band for Combined H
2O.
Water absorption behavior into acrylic fibers, which were taken at different steps in the wet spinning process, was investigated using this method. The fibers showed different ability of water absorption. Microstructural changes of the fibers caused by conditioning, steam-relaxing and drying of the fiber were discussed in connection with size of microcapillaries in the fiber. A model to explain the behavior was proposed. Combined H
2O in the fiber still remained even after vacuum drying at 80°C for 16 hours. It means difficulty to achieve bone-dry state of this fiber by ordinary ways.
Aging of the fiber caused its water absorption ability to increase and it was also attributed to the increase of capillaries' size.
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