Effect of Alkali Pretreatment on Selective Oxidation of Cotton Fiber by Sodium Periodate
The contrast of the structure and properties of cotton fiber with or without alkali pretreatment oxidised selectively by sodium periodate was carried out. The results showed that the cellulose crystals were gradually transformed from cellulose Ⅰ to cellulose Ⅱ as alkali treatment concentration range from 5wt％ to 25wt％, and alkali pretreatment led to decrystallinity, which can improve the reactivity of cotton fiber with sodium periodate and increase in aldehyde content. In the same oxidation process, the increasing of alkali concentration enhanced the degradation of the crystalline region of the oxidized samples. However, proper alkali pretreatment can reduce the degradation of modified cotton fiber resulted from increasing oxidant concentration up to 32g/l, which possibly dues to formation of more hemiacetal structure and improving intermolecular hydrogen bonding in oxidant reaction after sodium hydroxide treatment, leading to enhancement the ordered structure. Meanwhile, the breaking elongation of oxidized samples rapidly improved when increasing the alkali concentration above 10％ at the same oxidation condition while the breaking strengthen of oxidized samples changed a little with increasing alkali concentration.
cotton fiber alkali pretreatment selective oxidation structure properties
WANG Hao LIN Hong CHEN Yuyue
School of Material Engineering, Soochow University, Suzhou 215021, P. R China
国际会议
上海
英文
764-767
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）