Science:刚性与韧性兼顾的仿贻贝弹性体材料

Science:仿生制备出超强弹性体材料,刚性和延展性兼得

gaofenzi.org周末推荐文献:Science最近报道研究人员仿贻贝合成新型弹性体材料,材料机械性能极其优异,在保持延展性不降低的情况下,刚性和韧性显著提高。特别之处在于研究人员借助邻苯二酚与铁离子配合作用形成弹性体的交联点(网络聚合物),这种交联点在外力作用下可以分离与重构,所以使拉伸性能和刚性韧性兼得。

超强弹性体材料

参考文献:Toughening elastomers using mussel-inspired iron-catechol complexes,Science 27 Oct 2017:Vol. 358, Issue 6362, pp. 502-505,DOI: 10.1126/science.aao0350
Abstract
Materials often exhibit a trade-off between stiffness and extensibility; for example, strengthening elastomers by increasing their cross-link density leads to embrittlement and decreased toughness. Inspired by cuticles of marine mussel byssi, we circumvent this inherent trade-off by incorporating sacrificial, reversible iron-catechol cross-links into a dry, loosely cross-linked epoxy network. The iron-containing network exhibits two to three orders of magnitude increases in stiffness, tensile strength, and tensile toughness compared to its iron-free precursor while gaining recoverable hysteretic energy dissipation and maintaining its original extensibility. Compared to previous realizations of this chemistry in hydrogels, the dry nature of the network enables larger property enhancement owing to the cooperative effects of both the increased cross-link density given by the reversible iron-catecholate complexes and the chain-restricting ionomeric nanodomains that they form.

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