基于氢键作用和配位键交联的双可逆网络,制备了一种高性能、高修复效率的自愈合弹性体。首先采用二元醇和二异氰酸酯反应制备聚氨酯(PU)预聚物,然后以2,6-二氨基吡啶(2.6-DAP)为扩链剂,合成线性PU弹性体,最后通过掺杂Fe3+进行配位交联,制备了含有配位键与氢键双重动态网络的自愈合PU弹性体。采用红外光谱、万能试验机、偏光显微镜、流变仪表征了材料的分子结构、力学性能及自愈合性能。通过控制Fe3+的含量,可以调节自愈合PU弹性体力学性能和修复能力之间的关系。结果表明,当PU-DAP∶Fe3+=2∶1(吡啶与Fe3+物质的量之比)时,弹性体具有优异的力学和自修复性能,拉伸强度可达1.96MPa。
A self-healing elastomer with high performance and high repair efficiency was prepared based on a double reversible network of hydrogen bonding and coordination bond crosslinking.Firstly,polyurethane prepolymers were prepared by the reaction of diol and diisocyanate.Then,linear polyurethane elastomers were synthesized using 2,6-diaminopyridine (2.6-DAP) as chain extender.Finally,the self-healing polyurethane elastomers with dual dynamic networks of coordination and hydrogen bonds were prepared by doping Fe3+ for coordination crosslinking.The molecular structure,mechanical properties and self-healing properties of the materials were characterized by infrared spectroscopy,universal testing machine,polarizing microscope and rheological instrument.The relationship between the mechanical properties and repair ability of the self-healing PU elastomers could be adjusted by controlling Fe3+ content.The results showed that when PU-DAP∶Fe3+=2∶1 (the molar ratio of pyridine to Fe3+),the elastomer had excellent mechanical and self-healing properties,and the tensile strength could reach 1.96MPa.
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基金资助
江西省教育厅青年基金(GJJ190519)
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