纳米纤维素的制备与表征

Preparation and characterization of nanocrystal cellulose

以微晶纤维素为原料,通过硫酸酸解制备获得了纳米纤维素。实验优选获得了酸解制备纳米纤维素的优化条件为:硫酸初始浓度35%,反应温度40℃,酸解时间90 min,此优化条件下,纳米纤维素的产率可达83.55%;SEM和TEM观察产物的形态外貌,确定为纳米级纤维素;XRD分析显示纳米纤维素的结晶度要高于微晶纤维素,而TG分析显示NCC的热稳定性要低于微晶纤维素。

Nanocrystal cellulose was prepared by sulfuric acid hydrolysis microcrystalline cellulose .The optimal conditions for the preparation of nanocrystal cellulose were chosen as follows ：sulfuric acid initial concentration is 35%,reaction temperature is 40℃,and reaction time is 90 min.Under this condition ,the yield of nanocrystal cellulose reached 83.55%.The morphological structure of the product is verified to be nano-scale by SEM and TEM .Crystallinity of nanocrystal cellulose is higher than that of nanocrystal cellulose according to the results of XRD .The analysis of thermo gravimetric shows the thermal stability of nanocrystal cellulose is worse than microcrystalline cellulose .