Wan Jiqiang, Diao Huailing, Yu Jian, Song Guangjie, Zhang Jun
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100039, China; Technology Center, China Tobacco Henan Industrial Co., Ltd., Zhengzhou, 450000, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100039, China.
Carbohydr Polym. 2021 May 15;260:117816. doi: 10.1016/j.carbpol.2021.117816. Epub 2021 Feb 15.
A biaxially stretched cellulose film with high performance was manufactured from ionic liquid solution through an environmentally friendly, cost effective and facile process. As the transverse stretching ratio (TSR) is increased, the tensile strength and elastic modulus of the biaxially stretched cellulose film in transverse direction (TD) are significantly improved and the coefficient of thermal expansion in TD is reduced while the performance achieves balance in the machine direction (MD) and TD. The transverse stretching regulates the microfibril orientation in the gel film from dominantly uniaxial orientation in MD to homogeneous planar orientation. This microfibril orientation may further play a role in the orientation of the chains in the films during gel drying as evidenced from the birefringence and 2D XRD results. These results indicate cellulose film prepared from ionic liquid process could be utilized with improved structural and mechanical properties by biaxial stretching, and thus serves in various applications.
通过一种环境友好、成本效益高且简便的工艺，由离子液体溶液制备出了具有高性能的双轴拉伸纤维素薄膜。随着横向拉伸比（TSR）的增加，双轴拉伸纤维素薄膜横向（TD）的拉伸强度和弹性模量显著提高，TD方向的热膨胀系数降低，同时薄膜在纵向（MD）和TD方向的性能达到平衡。横向拉伸将凝胶薄膜中的微纤丝取向从MD方向占主导的单轴取向调节为均匀的平面取向。双折射和二维XRD结果表明，这种微纤丝取向在凝胶干燥过程中可能进一步影响薄膜中链的取向。这些结果表明，通过离子液体工艺制备的纤维素薄膜经双轴拉伸后可具有改善的结构和机械性能，从而可用于各种应用。
