论文部分内容阅读
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。
(2 +), Al ~ (3 +) and Fe ~ (3 +) enhanced agar were prepared by the one-pot method using hydrogel with both high strength and self-healing properties Agar - polyacrylic acid (PAAc) double network hydrogel Ca2 + / Agar-PAA, Al3 + / Agar-PAA and Fe3 + / Agar- glue. The effect of different polyvalent metal ions on Agar-PAAc double network hydrogel and the self-healing properties of Fe 3+ / Agar-PAAc were studied. The results showed that the tensile strength (320.7kPa) and elongation at break (1130%) of Fe ~ (3 +) / Agar-PAAc were 12 times and 9 times that of Ca ~ (2 +) / Agar- The elongation at break of Fe ~ (3 +) / Agar-PAAc is equivalent to that of Al ~ (3 +) / Agar-PAAc, but the tensile strength is 5 times of that of Al ~ (3 +) / Agar-PAAc. The sample was subjected to constant strain stretching to destroy the interior. The damaged Fe 3+ / Agar-PAAc was immersed in Fe 3+ for 30 min, and the recovery rate was 100%. Destroyed Fe 3+ / Agar-PAAc treated at 50 ℃ for 15 min, the recovery rate reached 100%. The severed Fe3 + / Agar-PAAc gel sections were held together for 48 hours in a sealed environment and the cross-section of the sample was self-healing and stretched to about 8 times the original length. Fe 3+ / AgarPAAc double network hydrogels have excellent mechanical properties and self-healing properties, and do not exert external stimuli such as temperature and chemical substances to achieve the self-healing properties of both networks.