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

发布时间：2018-03-09 17:22

  本文选题：金属离子　切入点：水凝胶　出处：《复合材料学报》2017年07期 　论文类型：期刊论文

【摘要】：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Ca~(2+)、Al~(3+)、Fe~(3+)增强琼脂(Agar)-聚丙烯酸(PAAc)复合双网络水凝胶Ca~(2+)/Agar-PAA、Al~(3+)/Agar-PAA和Fe~(3+)/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Fe~(3+)/Agar-PAAc的自修复自愈合性能。结果表明,Fe~(3+)/Agar-PAAc的拉伸强度(320.7kPa)和断裂伸长率(1 130%)分别为Ca~(2+)/Agar-PAAc的12倍和9倍,Fe~(3+)/Agar-PAAc的断裂伸长率与Al~(3+)/Agar-PAAc相当,但拉伸强度为Al~(3+)/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Fe~(3+)/Agar-PAAc在Fe~(3+)溶液中浸泡30 min,修复率达到100%。被破坏的Fe~(3+)/Agar-PAAc在50℃环境中处理15min,修复率达到100%。切断的Fe~(3+)/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。Fe~(3+)/AgarPAAc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。
[Abstract]:Hydrogels have both high strength and self-repairing properties. The polyvalent metal ions Ca~(2 / Agar-PAA / Ca~(2 / Agar-PAA / Agar-PAA / Agar-PAA / Fe~(3 / Agar-PAAc double network hydrogels were prepared by one-pot method. The effects of different multivalent metal ions on Agar-PAAc double-network hydrogels were studied. The results showed that the tensile strength and elongation at break of Fe~(3 / Agar-PAAc were 12 and 9 times of that of Ca~(2 / Agar-PAAc, respectively, and the elongation at break of Agar-PAAc was equal to that of Al~(3 / Agar-PAAc. But the tensile strength is 5 times higher than that of Al~(3 / Agar-PAAc. The damaged Fe~(3 / Agar-PAAc was immersed in the Fe~(3 solution for 30 minutes, and the repair rate reached 100. The damaged Fe~(3 / Agar-PAAc was treated at 50 鈩，

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