双醛纤维素碱性降解的研究

Research on Alkaline Degradation of Dialdehyde Cellulose

双醛纤维素具有生物相容性,环境友好。但双醛纤维素对碱敏感,在室温碱性条件下易发生快速的降解,限制了其应用。采用高碘酸钠氧化微晶纤维素制备双醛纤维素,研究双醛纤维素不同条件下的碱性降解。研究表明碱性降解过程中,随时间和碱用量的增加,碱水解反应的得率和醛含量降低,双醛纤维素碱性降解后,其结晶度增加,热稳定性得到改善。

Dialdehyde cellulose is biocompatible and environmental friendly.However,dialdehyde cellulose is sensitive to alkali and is prone to degrade under alkaline conditions,which limits its application.Microcrystalline cellulose was oxidized with sodium periodate,and the alkaline degradation of dialdehyde cellulose under different conditions was investigated.The results showed that the yield and aldehyde content decreased in the process of alkali hydrolysis reaction,the crystallinity of cellulose increased,and the thermal stability was improved.