文章摘要
不同盐溶液对杂化双交联聚丙烯酸水凝胶力学性能的调控
Modulation of Mechanical Properties of Hybrid Crosslinked Polyacrylic Acid Hydrogels by Different Saline Solutions
  
DOI:10.16865/j.cnki.1000-7555.2018.04.011
中文关键词: 金属离子  聚丙烯酸  水凝胶  力学性能  自愈合性
英文关键词: metal cations  polyacrylic acid  hydrogels  mechanical property  self-healing
基金项目:国家自然科学基金资助项目(51273059);湖北省教育厅青年基金资助项目(Q20151406);清华大学摩擦学国家重点实验室开放基金(SKLTKF 14A09)
作者单位
赵友姣3,李学锋1,2, 龙世军1,2, 张高文1,2, 徐 恒3 1. 湖北工业大学 绿色轻工材料湖北省重点实验室
2. 湖北工业大学 绿色轻质材料与加工协同创新中心
3. 湖北工业大学 材料与化学工程学院 湖北 武汉 430068 
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中文摘要:
      采用“一锅法”制备了杂化双交联聚丙烯酸水凝胶,再通过分别浸泡氯化铝、氯化钙、氯化钠形成聚丙烯酸-铝(PAAc-Al3+)、聚丙烯酸-钙(PAAc-Ca2+)、聚丙烯酸-钠(PAAc-Na+)杂化双交联水凝胶,同时对PAAc-Na+凝胶的自愈合性能进行研究。结果表明,随着金属离子价态及同等价态离子浓度的增加,凝胶的力学强度逐渐增加,PAAc-Al3+的拉伸强度达到3.47 MPa,比PAAc-Ca2+拉伸强度(2.63 MPa)、PAAc-Na+拉伸强度(1.79 MPa)大,但是断裂伸长率为PAAc-Na+的最优,达到1320.9%。同时对凝胶含水量进行测试可知,随着离子价态及同等价态离子浓度的增加,凝胶的含水量与体积逐渐减小,特别的是Na+调控的凝胶含水量与体积是先增加后减小。被宏观破坏的凝胶断面可自愈合,通过Na+调控后可拉伸至初始样条的0.3倍,拉伸强度约为初始样条的40%。
英文摘要:
      The hybrid daul-crosslinked polyacrylic acid hydrogels were prepared by "one-pot method". The mechanical properties of hybrid daul-crosslinked polyacrylic acid hydrogels were controlled by immersing aluminum chloride, calcium chloride and sodium chloride solution to form PAAc-Al3+ hybrid hydrogels, PAAc-Ca2+ hybrid hydrogels and PAAc-Na+ hybrid hydrogels, respectively. Meanwhile, the self-healing properties of PAAc-Na+ gels were also studied. With the increase of metal ion valence and the same valence ion concentration, the mechanical strength of the gel gradually increases. The tensile strength of PAAc-Al3+ gel is 3.47 MPa, which is higher than the tensile strength of PAAc-Ca2+ gel (2.63 MPa) and the tensile strength of PAAc-Na+ gels (1.79 MPa), but the elongation of PAAc-Na+ gel is the best, reaching 1320.9%. It is also found that the water content and volume of the gel decrease with the increase of ionic valence and the same valence ion concentration, especially gels containing water content and volume are increased first and then decreased by Na+ ion controlling. The cross section of the PAAc-Na+ gel that is macroscopically destroyed can self-heal, which can be stretched to 0.3 times of the initial splines and the tensile strength is about 40% of the initial splines.
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