摘要
采用ZnCl2水溶液处理漂白针叶浆的方法制备纤维素纳米纤维(NFs)。利用单因素实验分析了纳米纤维制备过程中预处理时间、纤维浓度、机械处理时间对纳米纤维得率的影响。确定了纳米纤维制备的最佳工艺条件为纤维浓度1.5%、ZnCl2溶解预处理时间为2.5 h、机械处理时间为25 min,得率达到75%。通过X-射线衍射(XRD)、傅里叶变化红外光谱(FT-IR)、透射电镜(TEM)分析,比较ZnCl2溶液处理对制备的纳米纤维结构和性能影响,ZnCl2溶液预处理方法制备纳米纤维的过程中,纤维晶型由纤维素Ⅰ型转化为纤维素Ⅱ型,同时官能团结构未发生明显变化,纳米纤维的平均直径约为10 nm。
A new approach was developed to prepare nanofibers （NFs） with high yield. The bleached chemical pulp of softwood was pretreated in ZnCl2 aqueous solution at a fixed temperature for a period of time. Cellulose fibers were swelled and dissolved. Then dissolved fibers were mixed with water and dispersed into NFs. Various influencing factors were investigated in an attempt to improve the yield of NFs. In addition, the NFs were characterized using Fourier transform infrared （FT-IR） spectrometer, an X-ray diffraction （XRD） and a scanning electron microscope （SEM）. The results demonstrated that the yield of NFs could be 75% when fibers with the concentration of 1.5% was performed with 65% （wt） ZnCl2 aqueous solution at 85℃ for 2.5 h, then dispersed in water for 25 min. Fibers treated according to this method had the skeleton of NFs and the average diameter was about 10 nm. The cellulose of the fiber was not chemically modified during this process, just the crystal form of cellulose was transformed from cellulose Ⅰ to cellulose Ⅱ.
出处
《纤维素科学与技术》
CAS
CSCD
2015年第1期49-54,共6页
Journal of Cellulose Science and Technology
基金
国家自然科学基金资助项目(031105010)
