2019开拓者vs火箭胜负关系:Science:剛性與韌性兼顧的仿貽貝彈性體材料

开拓者vs雷霆 www.yorqg.club Science:仿生制備出超強彈性體材料,剛性和延展性兼得

www.yorqg.club周末推薦文獻:Science最近報道研究人員仿貽貝合成新型彈性體材料,材料機械性能極其優異,在保持延展性不降低的情況下,剛性和韌性顯著提高。特別之處在于研究人員借助鄰苯二酚與鐵離子配合作用形成彈性體的交聯點(網絡聚合物),這種交聯點在外力作用下可以分離與重構,所以使拉伸性能和剛性韌性兼得。

超強彈性體材料

參考文獻: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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