The influence of high-energy irradiation and sodium hydroxide treatment on the structure of cotton-cellulose was studied. The effect of high-energy radiation was measured in an inert atmosphere and in the presence of oxygen. The irradiation resulted in a degradation of cellulose characterised by the decrease in the degree of polymerisation from 1200 to 300 (DP-viscosimetry) after irradiation with a dose of 15 kGy (dose rate 100 Gy/h). As a consequence of the oxidative degradation an increase in the carbonyl content (FTIR C=O stretching band at 1740 cm-1) was found. The treatment with NaOH after irradiation had no significant effect on these characteristics. However, as it was shown by XRD and SEM the transformation of the crystalline structure from cellulose I to cellulose II was observed at lower alkali concentration when irradiation pretreatment was applied. Cracks on the surface of the fibers were observed also by scanning electron microscope on samples irradiated with doses higher than 100 kGy.
|Number of pages||4|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Sep 1 2002|
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