材料科学
微纤维
纤维素
离子液体
复合材料
极限抗拉强度
热膨胀
横截面
双折射
弹性模量
化学工程
光学
化学
有机化学
物理
工程类
催化作用
结构工程
作者
Jiqiang Wan,Huailing Diao,Jian Yu,Guang‐Jing Song,Jun Zhang
标识
DOI:10.1016/j.carbpol.2021.117816
摘要
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.
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