乙烯醇
自愈水凝胶
材料科学
结晶度
化学工程
离子电导率
极限抗拉强度
聚乙烯醇
电导率
淀粉
电解质
离子键合
弹性模量
复合材料
傅里叶变换红外光谱
高分子化学
聚合物
化学
有机化学
离子
物理化学
工程类
电极
作者
Jing Lü,Oudong Hu,Linxi Hou,DeZhan Ye,Sen Weng,Xiancai Jiang
标识
DOI:10.1016/j.ijbiomac.2022.09.083
摘要
High-performance hydrogels with favorable mechanical strength, high modulus, sufficient ionic conductivity and freezing resistance have far-ranging applications in flexible electronic equipment. Nevertheless, it is challenging to combine admirable mechanical properties and high ionic conductivity into one hydrogel. Herein, a facile strategy was developed for the preparation of the hydrogel with excellent strength (1.45 MPa), super Young's modulus (8.85 MPa) and high conductivity (1.47 S/m) using starch and poly(vinyl alcohol) (PVA) as raw materials. The starch/PVA/Gly/Na3Cit (SPGN) gel was firstly cross-linked by crystalline regions of PVA upon freezing-thawing cycles. It was further immersed in the saturated Na3Cit solution to enhance the interaction between the substrates through the salting-out effect. The effect of soaking time on the crystallinity, intermolecular interactions, mechanical and electrical properties of SPGN gel was demonstrated by X-ray diffraction, Fourier transform infrared spectroscopy, tensile and impedance testing measurements. The introduction of glycerol and Na3Cit also endowed SPGN gels with favorable anti-freezing properties. The SPGN gel could maintain high mechanical flexibility and ionic conductivity at −15 °C.
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