以微晶纤维素为原料，直接采用高碘酸钠氧化"一步法"制备了二醛纳米纤维素（DANC）。通过单因素实验探讨了不同氧化条件对产物醛基含量及产率的影响。利用红外光谱、X射线衍射、透射电镜和热重分析对优化氧化条件下制备的产物进行表征。结果表明，在40℃、pH为4的条件下，用0.5 mol/L的高碘酸钠氧化40 g/L的微晶纤维素，可以得到基本无定型的DANC，醛基含量为6.84 mmol/g，产率为49%，长度与直径主要分布在110~170 nm与10~20 nm。DANC易团聚，加入少量壳寡糖可以明显增加纳米纤维素在水中的分散稳定性。

At present,it is of great significance to develop an environmentally friendly,efficient and low energy consumption method for the preparation of dialdehyde nanocellulose (DANC).DANC is prepared via one step method by using microcrystalline cellulose (MCC) as raw material and sodium periodate as oxidant.The effects of different oxidation conditions on the aldehyde content and yield of the product are investigated by single factor experiments.The products prepared under the optimized oxidation conditions are characterized by FT-IR,XRD,TEM and TG.It is shown that an amorphous DANC with an aldehyde content of 6.84 mmol·g^-1 can be obtained when 40 g·L^-1 of microcrystalline cellulose is oxidized by 0.5 mol·L^-1 of sodium periodate at 40℃ and pH=4.The yield of DANC can reach 49%.The length and diameter of DANC distribute in the range of 110-170 nm and 10-20 nm,respectively.DANC is easy to agglomerate,and adding a small amount of chitosan oligosaccharide can significantly increase the dispersion stability of DANC in water.

孟宇(1995-),男,硕士研究生,主要研究方向为纤维素的改性与利用,791003062@qq.com