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Cellulose whiskers were obtained by means of sulfuric acid hydrolysis of curauá fibers. Before hydrolysis, the natural fibers were treated with an alkaline solution to remove the non-cellulosic content. Fiber degradation evolution and cellulose whisker formation were analyzed by structural and morphological analysis. The original fiber structure underwent a fragmentation mechanism after being exposed...
The degradation of cellulose to lmw samples with varying from 15 to 130 is investigated. Cellulose samples prepared from the hydrolysis of regenerated cellulose fibers in dilute HCl possess $\overline {DP} _{{\rm w}} $ = 50. Applying homogenous degradation of microcrystalline cellulose in H3PO4 at RT for 3 weeks, samples with $\overline {DP} _{{\rm w}} $ = 35 and a PDI of...
Conformationally ordered, double-stranded xanthan, degraded in the presence of H 2 O 2 and Fe 2+ (at 20°C) or in dilute acid (0.1 M HCl at 80°C), produced xanthan variants with weight-average molecular weights (M w ) ranging from 2 10 6 to 5.4 10 4 . In both cases the fraction of cleaved linkages in the glucan backbone (α), measured as reducing...
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