材料科学
形状记忆合金
复合材料
木质素
纤维素
傅里叶变换红外光谱
极限抗拉强度
醋酸纤维素
复合数
形状记忆聚合物
延伸率
化学工程
化学
工程类
有机化学
作者
Yang Hua,Dong Wang,Hongjie Bi,Zechun Ren,Min Xu,Zhenhua Huang,Liping Cai
摘要
Abstract An information encryption device using shape memory cellulose acetate (CA) as matrix, and lignin as photothermal agent was developed. Such information encryption was chiefly composed of two steps, that is, information concealing by fixing temporary shapes and information decryption by restoring original shape based on preset sequential lighting commands. This film device was fabricated readily by solution blending. Further related analyses on the photo‐assisted shape memory mechanism of such composites were carried out. Compared to other samples, the CA/lignin‐3 composites possessed the most excellent shape memory properties as its shape recovery angle of 180° and shape fixation angle of 30°. It had good mechanical, thermomechanical, and superior photothermal conversion properties. The elongation at break and tensile strength was 24% and 4.5 MPa, the glass transition temperature was 30–130°C. The results of the Fourier transform infrared and Ultraviolet–Visible spectra illustrated the tight relationship between conjugated chromophoric systems and photothermal conversion of composites.
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