Abstract
A process of oxidation of rice starch using UV irradiation and hydrogen peroxide (H2O2) as a photo initiator was adopted. Factors affecting the photo oxidation process were studied. The extent of oxidation was determined by determining the carboxyl content, the carbonyl content and the viscosity of the oxidized rice starch obtained. Study showed that optimum conditions for the oxidation system were: using 0.4% of H2O2 based on weight of starch (ows) and a material to liquor ratio of 1:6 at 333 K for five hour of UV irradiation The produced oxidized rice starch was utilized as a sizing agent for cotton yarns. The sizing agent prepared (the oxidized rice starch) was evaluated by measuring the tensile strength (kg) and elongation at break (%) of the sized cotton yarns and determining of the percent of size removed from the sized cotton yarns by washing. Cotton yarns sized by oxidized starch used by Misr company of Spining and Weaving in Mahalla El-Kubra was compared with the cotton yarns sized by our oxidized starch in terms of tensile strength (kg), elongation at break (%) and size removal (%). The results obtained were: 490 kg, 456 kg; 5.4 (%), 4.7 (%); and 86 (%), 55 (%) for tensile strength, elongation at break and size removal (%) for cotton yarns sized by Our oxidized starch and cotton yarns sized by oxidized starch used by the company respectively. In other meaning our oxidized rice starch is competing with the oxidized starch used by the company.