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Quantitative analysis of water combined with nitrile group, Combined H20, in acrylic fibers was investi gated using infrared spectro-scopical technique, and a practical method was proposed. IR absorbance at 3630 cm was selected as key band for Combined H2O. 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 H20 in the fi ber still remained even after vacuum drying at 80 •Ž 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. (Received June 23, 1995)

Quantitative Analysis of Water Combined with Nitrile Group in Acrylic Fibers and Moisture Absorption Behavior into the Fiber Microstructure.