玉米秸秆糠醛剩余物纳米纤维素薄膜的制备与表征

Preparation of Nanocellulose Films from Corn Straw Furfuryl Residue

关键词:  玉米秸秆糠醛剩余物  酸水解  TEMPO氧化  超声法  纳米纤维素薄膜

Key Words:corn straw furfuryl residue  acid hydrolysis  TEMPO oxidation  ultrasound method  nanocellulose film

摘要:本研究通过硫酸水解、超声和TEMPO（2,2,6,6-四甲基哌啶氧化物）氧化3种处理方法分别制备了纳米纤维素（CFR-CNC、CFR-CNF和CFR-TNC）及相应薄膜，对纳米纤维素微观形态、结晶度、热稳定性和化学结构进行了表征，同时比较了纳米纤维素薄膜的形态和机械性能。结果表明，3种纳米纤维素具有不同的长宽比（29.2、163.7、132.2）和结晶度（62.5%、52.8%、43.9%）。红外光谱图表明，3种纳米纤维素的纤维素分子结构并未改变，且CFR-TNC成功引入羧基。3种纳米纤维素薄膜中，CFR-CNF薄膜具有较高的拉伸强度（36.6 MPa），CFR-CNC薄膜具有较好的抗形变能力，并且3种薄膜均具有良好的透光性。

Abstract:In this study， the nanocellulose （CFR-CNC， CFR-CNF and CFR-TNC） were obtained by three methods： acid hydrolysis， ultrasonication and TEMPO （2，2，6，6-tetramethylpiperidine oxide） oxidation， respectively. The microscopic morphology， crystallinity， thermal stability and chemical structure of the films from corresponding nanocellulose were characterized， and the morphological and mechanical properties were also compared. The results showed that the three nanocelluloses had different aspect ratios （29.2， 163.7， 132.2） and crystallinity （62.5%， 52.8%， 43.9%）. The infrared spectra showed that the cellulose molecular structure of the three nanocelluloses didn't change， and CFR-TNC successfully introduced carboxyl groups. Among the three nanocellulose films， the CFR-CNF film had higher tensile strength （36.6 MPa）， the CFR-CNC film had better resistance to deformation， and all films had good transparence.