溶剂交换法制备纳米纤维素多孔薄膜及其结构表征

摘要

Nanocellulose porous membranes with nanometer pore structure were prepared using nanofibrillated cellulose as raw material through vaccum filtration technology in combination with solvent exchange and drying.The effects of various solvents and drying methods on the surface morphology of the membranes were discussed.The nanocellulose membrane prepared through alcohol and tert-butanol stepwise dehydration and freeze drying method possessed an uniform distribution porosity of 42.95％ (pore diameter was about 100 ～200 nm).The nanocellulose porous membranes with large pore diameter,high porosity,good wettability and thermal stability had great application potential in efficient filtration,biomedicine,analysis and detection fields.%以纳纤化纤维素(NFC)为原料,通过真空抽滤制备NFC湿膜,采用多步法完成溶剂交换并干燥制得具有纳米孔洞结构的NFC多孔薄膜;探讨了不同溶剂和干燥方法对NFC多孔薄膜表面形貌的影响.结果表明,经真空抽滤得到的NFC湿膜先用乙醇后用叔丁醇溶剂交换并冷冻干燥制得的NFC多孔薄膜的表面孔径分布均匀(孔径100～200 nm)、孔隙率为42.95％;通过该方法制得的NFC多孔薄膜的孔径大、孔隙率高,具有良好的润湿性和热稳定性,在高效过滤、生物医药和分析检测等领域的应用前景广泛.