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- 2017
多价金属离子增强琼脂-聚丙烯酸复合双网络水凝胶及其自修复性能
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Abstract:
使水凝胶同时具备高强度和自修复性能，采用"一锅法"制备了多价金属离子Ca2+、Al3+、Fe3+增强琼脂（Agar）-聚丙烯酸（PAAc）复合双网络水凝胶Ca2+/Agar-PAA、Al3+/Agar-PAA和Fe3+/Agar-PAAc双网络水凝胶。研究不同多价金属离子对Agar-PAAc双网络水凝胶的增强作用及Fe3+/Agar-PAAc的自修复自愈合性能。结果表明，Fe3+/Agar-PAAc 的拉伸强度（320.7 kPa）和断裂伸长率（1 130%）分别为Ca2+/Agar-PAAc的12倍和9倍，Fe3+/Agar-PAAc 的断裂伸长率与Al3+/Agar-PAAc 相当，但拉伸强度为Al3+/Agar-PAAc的5倍。对样品实施定应变拉伸使内部发生破坏，被破坏的Fe3+/Agar-PAAc 在Fe3+溶液中浸泡30 min，修复率达到100%。被破坏的Fe3+/Agar-PAAc在50℃环境中处理15 min，修复率达到100%。切断的Fe3+/Agar-PAAc凝胶断面被固定在一起，在密封环境中放置48小时，试样断面可自愈合，且可拉伸至约8倍初始长度。Fe3+/Agar-PAAc双网络水凝胶具有优异力学性能和自修复性能，不施加温度、化学物质等外界刺激，实现两重网络均具有自修复性能的效果。 To obtain hydrogels with tough and self-healing properties, Ca2+/Agar-Polyacrylic acid(Ca2+/Agar-PAAc), Al3+/Agar-PAAc, Fe3+/Agar-PAAc composite double network hydrogels reinforced by ionic iron Ca2+, Al3+, Fe3+ cations were prepared by "one-pot" method. The enhancement function of metal ions Ca2+, Al3+, Fe3+, self-repairing properties, self-healing properties of reinforced hydrogels were studied. The tensile strength 320.7 kPa and elongation at break 1 130% of Fe3+/Agar-PAAc double network(DN) gels are 12 times and 9 times respectively those of Ca2+/Agar-PAAc DN gels. The tensile strength 320.7 kPa of Fe3+/Agar-PAAc DN gels is 5 times as large as that of Al3+/Agar-PAAc DN gels, elongation ratios of them are the same. Tensile with certain stain was applied to the sample to obtain damaged samples. The mechanical properties of Fe3+/Agar-PAAc DN hydrogels can be recovered to 100% of initial state after being soaked in ferric ion solution for 30 min. The mechanical properties of Fe3+/Agar-PAAc DN hydrogels can be recovered to 100% of initial state after being put in 50℃ condition for 15 min. By simply placing two hydrogel portions together and allowing enough self-healing time(48 h) for physical interactions to reestablish the network at the interface, the healed Fe3+/Agar-PAAc DN hydrogels can be stretched to 800% of initial length. The Fe3+/Agar-PAAc DN hydrogels reinforced by Fe3+ possess excellent mechanical properties and self-healing properties, without adding any chemicals and external stimuli, both networks possess self-healing properties. 国家自然科学基金（51273059）；清华大学摩擦学国家重点实验室开放基金（SKLTKF14A09）
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