利用高碘酸钠氧化制备椰衣醛基纤维

Preparation of Aldehyde Coir Fiber Via Sodium Periodate Oxidation

利用高碘酸钠作为氧化剂,选择性地氧化椰衣纤维上的羟基,使其转化为椰衣醛基纤维。椰衣纤维氧化过程中,采用盐酸羟胺滴定法跟踪测定其醛基的浓度,以考察椰衣纤维的氧化进程。结果表明:当高碘酸钠溶液浓度为0.7 mol/L,氧化温度为50℃,氧化时间为3.5 h,高碘酸钠溶液p H为2.8时,氧化效果最佳,椰衣纤维上醛基的量增加,椰衣纤维的结构和功能也将发生了变化,为下一步合成新的椰衣纤维高聚物提供有效的反应点位。

In this study, sodium periodate was used as oxidant to oxidize the hydroxyl groups on the coir fiber selectively, and to make the coir fiber into a coir aldehyde fiber. During the process of coir fiber oxidation, the hydroxylamine hydro- chloride titration was taken to determine the concentration of aldehyde. The results showed that when the concentration of sodium periodate solution was 0.7mol/L,oxidation temperature was 50 ℃ ,oxidation time was 3.5 h and the pH of sodi- um periodate solution was 2.8, the oxidation effect was best and the amount of aldehyde group in the coir fiber in- creased. In addition,the structure and function of coir fiber changed. The results of this study provided foundation for synthesis of new coir fiber polymer in futrue.