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SUMMARY:Changes in the grade of order of different cellulose fibres (wood pulps and cotton linters) resulting by treatment with alkali in a concentration range between 0 and 50 % NaOH were pursued by infrared-spectroscopy and x-ray-diffraction. The determination of an IRindex as a relation of the peak areas in the regions of 1370 and 670 cm-1 permitted an easily practicable method to determine the crystallinity, which shows a significant decrease by treatment with lye concentrations between 7.5 and 15% NaOH. The more labourious xray-measurements of the crystallinity index confirm the results of infrared-spectroscopy. Some differences in the course of the IRindex curves show the possibility to draw conclusions in respect to the activation ability of particular fibre samples.

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