1. 毕业设计（论文）的内容和要求

纤维素是自然界中最常见的天然多糖高分子聚合物，具有可生物降解、生物相容性好、稳定性高、安全无毒、环境友好、来源广、可再生、价格低廉等多重优点。

纤维素是由葡萄糖单元组成的线型高聚物，纤维素分子中因存在大量羟基而形成分子间和分子内氢键网络结构，从而导致不同程度的有序晶体排列，使其难溶于常见的有机溶剂，这样极大地制约了纤维素作为最丰富的天然高分子聚合物的开发和应用。

微晶纤维素是纤维素经酸水解处理获得的，其无定形区部分降解，保留了其高结晶结构。

2. 参考文献

[1] Ling Z.; Chen S.; Zhang X., et al. Exploring crystalline-structural variations of cellulose during alkaline pretreatment for enhanced enzymatic hydrolysis[J]. Bioresource Technology. 2017, 224: 611-617. [2] Klemm D.; Heublein B.; Fink H.P., et al. Cellulose: fascinating biopolymer and sustainable raw material[J]. Angewandte Chemie International Edition. 2005, 44(22): 3358-3393. [3] Ling Z.; Chen S.; Zhang X., et al. Exploring crystalline-structural variations of cellulose during alkaline pretreatment for enhanced enzymatic hydrolysis[J]. Bioresource Technology. 2017, 224: 611-617. [4] Harmon K.M.; Akin A.C.; Keefer P.K., et al. Hydrogen bonding Part 45. Thermodynamic and IR study of the hydrates of N-methylmorpholine oxide and quinuclidine oxide. Effect of hydrate stoichiometry on strength of H O H#8943;O N hydrogen bonds; implications for the dissolution of cellulose in amine oxide solvents[J]. Journal of Molecular Structure. 1992, 269(1-2): 109-121. [5] Hello K.M.; Hasan H.R.; Sauodi M.H., et al. Cellulose hydrolysis over silica modified with chlorosulphonic acid in one pot synthesis[J]. Applied Catalysis A: General. 2014, 475: 226-234. [6] Cai J.; Zhang L.; Chang C., et al. Hydrogen-Bond-Induced Inclusion Complex in Aqueous Cellulose/LiOH/Urea Solution at Low Temperature[J]. ChemPhysChem. 2007, 8(10): 1572-1579. [7] Sescousse R.; Le K.A.; Ries M.E., et al. Viscosity of cellulose-imidazolium-based ionic liquid solutions[J]. The Journal of Physical Chemistry B. 2010, 114(21): 7222-7228. [8] Gupta K.M.; Jiang J. Cellulose dissolution and regeneration in ionic liquids: A computational perspective[J]. Chemical Engineering Science. 2015, 121: 180-189. [9] Bi Xiong.; Pingping Zhao.; Kai Hu., et al. Dissolution of cellulose in aqueous NaOH/urea solution: role of urea[J]. Cellulose,2014,21(3):1183-1192. [10]陈雄. 低温NaOH/尿素体系中纤维素溶解及其新型水凝胶制备[D].北京林业大学,2016. [11] Yanping Yang.; Yue Zhang.; Ahmed Dawelbeit., et al. Structure and properties of regenerated cellulose fibers from aqueous NaOH/thiourea/urea solution[J]. Cellulose,2017,24(10):4123-4137. [12] Fei Lu.; Chao Zhang.; Hongliang Kang., et al. Extensional rheology of cellulose/NaOH/urea/H2O solutions[J]. Cellulose,2016,23(5):2877-2885.

3. 毕业设计（论文）进程安排

2018.11.15 确定论文题目 2018.11.15~2019.01.15 查找资料、完成开题报告 2019.02.25~2019.03.15 准备实验 2019.03.15~2019.05.25 完成实验 2019.05.25~2019.06.01 完善实验、完成初稿 2019.06.01~2019.06.08 论文修改 2019.06.11~2019.06.16 论文答辩