Self-healing properties of various multivalent cations reinforced Agar-Polyacrylic acid composite double network hydrogels
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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。Abstract: 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.
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Key words:
- cations /
- hydrogels /
- mechanical property /
- self-healing materials /
- Agarose /
- PAAc
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