纳米纤维素的制备及表征

Preparation and Characterization of Nanocellulose

纳米纤维素由于其固有的特性,包括纳米尺寸、高比表面积、独特的形态、低密度和机械强度以及实用性、可再生性和生物降解能力,引起了人们极大的兴趣。所以寻求一种简易可行、操作简单的纳米纤维素制备方法尤为重要。以人纤浆为原料,采用NaOH溶液冻融法制备了纳米纤维素,研究了NaOH溶液浓度、超声时间和超声功率等因素对纳米纤维素得率的影响,进行了试验优化,并对制备的纳米纤维素的性能进行了一系列的表征。结果表明,NaOH溶液浓度7%,超声时间5 h,超声功率800 W,冻融循环次数2次,纳米纤维素的得率最高,达到25.89%。

Nanocellulose had attracted great interest due to its inherent properties,including nanometer size,high specific surface area,unique morphology,low density and mechanical strength,as well as practicability,reproducibility,and biodegradability.Therefore,it was especially important to seek a simple and feasible nanocellulose preparation method.Cellulose fiber pulp was used as raw material,and nanocellulose was prepared by freeze-thaw method with the assistance of NaOH solution.The effects of NaOH solution concentration,ultrasonic time and ultrasonic power on the yield of nanocellulose were studied.An optimization experiment was carried out to characterize the obtained nanocellulose.The results showed that under NaOH solution concentration of 7%,ultrasonic time of 5 h,ultrasonic power of 800 W,and freeze-thaw cycles of 2 times,NCC had the highest yield of 25.89%.