【作者】 李厦； 卢潇冰； 陈霖铮； 张勇；

【Author】 LI Sha~1 LU Xiao-bing~1 CHEN Lin-zheng~1 ZHANG Yong~(1,2,*) (1.College of Material and Textiles,Zhejiang Sci-Tech University,Hangzhou,Zhejiang province,310018; 2.College of Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou,Zhejiang Province,310014)

【机构】 浙江理工大学材料与纺织学院； 浙江工业大学化学工程与材料学院；

【摘要】 以毛竹纤维素构建实验基质,选用丝状真菌里氏木霉所产胞外纤维素酶,通过受控水解工艺制备竹材纤维纳米微晶纤维素(NCC)。同时利用场发射扫描电镜(FESEM)观察毛竹纤维NCC的形貌尺寸,利用X射线衍射仪(XRD)评价毛竹NCC的结晶程度,利用北欧标准黏度计测定NCC的纤维素聚合度,利用Zeta电位测定仪表征NCC胶体溶液的表面电荷。结果表明,通过纤维素酶受控水解工艺制备的毛竹NCC材料,均呈现棒状形貌,平均直径24.7 nm,平均长度286 nm,长径比12。酶解制备的毛竹NCC,其化学结构中没有引入磺酸基团,Zeta电位仅为传统硫酸水解工艺制备的毛竹NCC 1/4。更多还原

【Abstract】 The extracellular cellulase enzyme produced by Trichoderma reesei was used to prepare nanocrystalline cellulose(NCC) by controlled hydrolysis of bamboo fibers.The morphology of the prepared bamboo cellulose nanocrystals was characterized by field emission scanning electron microscopy and the crystallinity was measured by X-ray diffraction.The degree of polymerization was tested by automatic viscosimeter.The surface charge in suspension was estimated by Zeta-potential.The results showed that all NCC from bamboo fibers presented a rod-like shape,an average diameter of 24.7 nm and length of 286 nm,with an aspect ratio of around 12.The zeta potential of cellulase hydrolyzed NCC was 4 times lower than that of NCC prepared by acid hydrolysis process.更多还原