本文利用乙酰化反应制备了乙酰化纤维素纳米晶（ACNC），研究了ACNC的添加对PVC膜结构和性能的影响。研究结果表明，ACNC的引入，可有效调节PVC膜的相分离成形速率、膜材料亲水性，调控膜微结构。适宜的ACNC添加，可使PVC膜的纯水接触角降低 18.3%，纯水通量提升 77.6%，拉伸强度提升68.4%，通量恢复率提升59.5%，而膜对BSA的截留率保持稳定。

 Acetylated cellulose nanocrystals (ACNC) were prepared by acylation reaction, and the effects of the addition of ACNC on the structure and properties of PVC membrane were studied. The results show that the introduction of ACNC can effectively adjust the phase separation forming rate of PVC membranes, the hydrophilicity of membrane materials, and regulate the microstructure of membranes. Appropriate ACNC addition can reduce the pure water contact angle of the PVC membrane by 18.3%, increase the pure water flux by 77.6%, increase the tensile strength by 68.4%, and increase the flux recovery rate by 59.5%, while the BSA rejection rate of the membrane remains stable.

 [1] T.H. Bae, T.M. Tak, et al.  Interpretation of fouling characteristics of ultrafiltration membranes during the filtration of membrane bioreactor mixed liquor [J].Journal of Membrane Science, 2005, 264:151-160.
[2] R. Zhang, Y. Liu, M. He, Y. Su, et al. Antifouling membranes for sustainable water purification: strategies and mechanisms [J]. Chemical Society Reviews, 2016,45:5888-5924.
[3] H. Wu, T. Li, B. Liu, C. Chen, S. et al. Blended PVC/PVC-g-PEGMA ultrafiltration membranes with enhanced performance and antifouling properties[J]. Applied Surface Science, 2018,455:987-996.
[4] K.K. Sadasivuni, D. Ponnamma, et al.  Flexible NO2 sensors from renewable cellulose nanocrystals/iron oxide composites[J]. Sensors and Actuators B: Chemical, 2016,233:633-638.
[5] A. Santamaria-Echart, L. Ugarte, et al. Cellulose nanocrystals reinforced environmentally-friendly waterborne polyurethane nanocomposites [J]. Carbohydrate Polymers, 2016,151:1203-1209.
[6] Z. Zhang, Q. Wu, K. Song, S. Ren, et al. Using Cellulose Nanocrystals as a Sustainable Additive to Enhance Hydrophilicity, Mechanical and Thermal Properties of Poly(vinylidene fluoride)/Poly(methyl methacrylate) Blend, ACS Sustainable Chemistry & Engineering [J]. 2015,3:574-582.
[7] J. Lv, G. Zhang, H. Zhang, et al. Improvement of antifouling performances for modified PVDF ultrafiltration membrane with hydrophilic cellulose nanocrystal [J]. Applied Surface Science, 2018,440:1091-1100.
[8] D. Zhang, A. Karkooti, L. Liu, et al. Fabrication of antifouling and antibacterial polyethersulfone (PES)/cellulose nanocrystals (CNC) nanocomposite membranes [J].Journal of Membrane Science, 2018,549 :350-356.
[9] 李帅, 高源. 纳米纤维素对复合超滤膜力学性能的影响[C]//第四届中国膜科学与技术报告会.中国北京, 2010.
[10] 胡飞. 纤维素纳米晶的酯化反应修饰及改性聚酯发泡材料的研究[D].湖北:武汉理工大学, 2015.
[11] 王帅. 改性纳米纤维素的制备与聚醚砜混溶制膜机制及其性能研究[D].山东:青岛科技大学, 2017.
[12] C. Wu, W. Tang, J. Zhang, S. Liu, et al. Preparation of super-hydrophobic PVDF membrane for MD purpose via hydroxyl induced crystallization-phase inversion [J]. Journal of Membrane Science, 2017,543 :288-300.
[13] X. Fan, Y. Su, X. Zhao, Y. Li, et al.  Fabrication of polyvinyl chloride ultrafiltration membranes with stable antifouling property by exploring the pore formation and surface modification capabilities of polyvinyl formal [J]. Journal of Membrane Science, 2014,464:100-109.
[14] R. Kumar, A.M. Isloor, et al. Permeation, antifouling and desalination performance of TiO2 nanotube incorporated PSf/CS blend membranes [J]. Desalination, 2013,316:76-84.
[15] D.G. Liu, T.H. Zhong, et al. Starch composites reinforced by bamboo cellulosic crystals [J]. Bioresour. Technol, 2010,25: 2529-2536.
[16] A. Alemdar, M. Sain, et al. Isolation and characterization of nanofibers from agricultural residues - Wheat straw and soy hulls[J]. Bioresour. Technol, 2008,99:1664-1671.
[17] M. Baghbanzadeh, D. Rana, et al. Effects of hydrophilic silica nanoparticles and backing material in improving the structure and performance of VMD PVDF membranes [J]. Separation And Purification Technology, 2016,157: 60-71.
[18] M. Baghbanzadeh, D. Rana, et al.  Effects of hydrophilic CuO nanoparticles on properties and performance of PVDF VMD membranes [J]. Desalination, 2015, 369:75-84.
[19] Z. Zhang, Q. Wu, K. Song, et al.Poly(vinylidene fluoride)/cellulose nanocrystals composites: rheological, hydrophilicity, thermal and mechanical properties [J]. Cellulose, 2015, 22:2431-2441.
[20] 刘富. PVDF、PVC微孔膜亲水化改性的研究,[D].浙江:浙江大学, 2007.