弹性体
材料科学
自愈
硅酮
复合材料
聚合物
医学
替代医学
病理
作者
Lei Wang,Yuanbo Cai,Haoruo Zhang,Huawei Zou,Yang Chen,Mei Liang,Zhengguang Heng
出处
期刊:Polymer
[Elsevier]
日期:2022-09-01
卷期号:256: 125272-125272
被引量:4
标识
DOI:10.1016/j.polymer.2022.125272
摘要
The linear self-healing matrix had certain defects in the aspects of physical and mechanical properties, heat resistance and solvent resistance, which limited its application in engineering. However, if the conventional cross-linked structure was integrated into material matrix, the self-healing properties of the material would be sacrificed seriously. To address the drawbacks of linear and cross-linked self-healing polymers, reversible cross-linked structural units were designed to balance the two aspects. The silicone elastomers were endowed with outstanding mechanical properties and self-healing ability at room temperature by introducing a tri-functional cross-linking agent “Trimer of hexaethylene-diisocyanate (Tri-HDI)” to PDMS linear structure, and distributing dynamic disulfide bonds around of the cross-linking points to build the reversible cross-linking structural units. The influence of cross-linker content on the mechanical properties, self-healing properties and heat resistance of the elastomer was systematically investigated in this paper. Then, the soft and hard segment structures at different temperatures of the self-healing materials was characterized by low-field NMR as an innovative structural characterization. This room temperature self-healing elastomer with reversible cross-linked structure had great potential for industrial applications.
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