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G. V. Kovalev, L. T. Bugaenko
Effect of g-irradiation on the
structure of cellulose
Abstract
Effect
of g-irradiation on
water penetrability in the dose range 0 – 2.0 MGy was investigated from dose
dependence of equilibrium moisture content and water-holding capacity upon
swelling. It was found, that the dose dependence of these characteristic in the
dose range 0 – 0.5 MGy exhibited decrease followed by an increase. The date on
decay of macroradicals generated by radiation revealed in the dose range
of 0 – 2.0 MGy the correlations between
water-penetrability of g-irradiated celluluse
and mobility of cellulose macromolecules and their accessibility for water
absorbtion. The results obtained were explained using an assumption about the
influence of radiation-induced crosslinks on submicroscopic capillarity of cellulose structure. Decrease
in cellulose crystallinity was observed
at the doses above 1 MGy. It was found, that the decrease in cristallinity of
cellullose occurse to a large extent, if
irradiated cellulose is swelled in water. The degree of crystallinity of
cellulose remains unchanged at the doses below 1 MGy, which was explained by
formation of radiation-induced cross-linking.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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