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http://nopr.niscpr.res.in/handle/123456789/33381| Title: | Periodate Oxidation of Benzylated Cellulose |
| Authors: | Chatterjee, S. M. |
| Issue Date: | Sep-1976 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Periodate oxidation of
bentylated cellulose has been investigated and the accessibility to periodate
determined to express quantitatively the blocking of the secondary alcoholic
groups of cellulose in benzylation, Purified cotton yarn was partially
benzylated to three low DS values, averaging 0.18-0.55, to retain the fibrous
structure of cotton. Benzylation of the cotton yarn was carried out in both
stretched condition to maintain the original length and in unstretched
condition to permit free contraction. Partially benzylated cellulose was
oxidized with sodium metaperiodate at room temperature (32°C) for different
periods (4-48 hr). Untreated cotton was also oxidized as a control for
comparison. The oxidant consumed by the samples was expressed in terms of atoms
of oxygen per 100  -glucopyranose unit (GPU). The oxidized samples were analyzed
for their reducing power in terms of copper number. The percentage
accessibility to periodate oxidation was calculated from oxygen consumption
values. In most cases, the oxygen consumption, copper number of oxidized
samples, and the accessibility of benzylated cellulose on periodate oxidation
were influenced by the DS, but were unaffected by the tensional forces on the
yarn during benzylation. Benzylated cellulose undergoes oxidation at a slower
rate (assessed in terms of rate constant, time of half reaction and percentage
accessibility) than untreated cellulose, indicating blocking of secondary
alcoholic groups of cellulose by benzyl groups. The rate of oxidation was
slower at higher DS and was independent of tensional forces. |
| Page(s): | 91-94 |
| ISSN: | 0975-1025 (Online); 0971-0426 (Print) |
| Appears in Collections: | IJFTR Vol.01(3) [September 1976] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJFTR 1(3) 91-94.pdf | 1.16 MB | Adobe PDF | View/Open |
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