Abstract
This paper reports on a spectrophotometric method for rapidly determining the reactivity of dissolving pulps. After mercerization and xanthation, the dissolved cellulose fractions in the viscose dope were re-precipitated by acidification. This transmittance/absorbance of fibril suspension was measured by visible spectroscopy, showing a strong linear correlation (R2 = 0.997) between the absorbance at 600 nm and the amount of the regenerated cellulose in the sample; i.e., the pulp reactivity. The results measured by the present method and those of the commonly used modified Fock method were in good agreement, with a relative difference of less than 11 %. In summary, the new method is rapid, simple, practical and suitable for use in determining the reactivity of dissolving pulps in laboratory or industrial applications.
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