基于咪唑脲键和铜离子配位键的自愈合聚氨酯  

Self-Healing Polyurethane Based on Imidazole-Urea Bond and Cu(Ⅱ)Coordination Bond

作　　者：张幼维[1] 朱文凡 李闯 杨磊 玉姣 游正伟[1] ZHANG Youwei;ZHU Wenfan;LI Chuang;YANG Lei;YV Jiao;YOU Zhengwei(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201600,China;Jiangsu Wansheng Dawei Chemical Co.,Ltd.,Taixing 225400,China;Liaoning Provincial Key Laboratory of Novel Micro-Nano Functional Materials,Liaoning Petrochemical University,Fushun 113001,China)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室,上海201600 [2]江苏万盛大伟化学有限公司,江苏泰兴225400 [3]辽宁石油化工大学辽宁省新型微纳米功能材料研究重点实验室,辽宁抚顺113001

出　　处：《中国材料进展》2023年第7期566-574,共9页Materials China

基　　金：国家自然科学基金项目(52173117,12074160);上海市“科技创新行动计划”“一带一路”国际合作项目(20520741000)。

摘　　要：将2,2-二咪唑甲烷(BIM)和聚四氢呋喃二醇(PTMG)与异佛尔酮二异氰酸酯(IPDI)反应制备了含有动态咪唑脲键(BIMU)的线性结构的自愈合聚氨酯弹性体(BIMU-LPU)。将Cu(Ⅱ)引入到聚合物网络中,BIMU-LPU通过咪唑与铜离子形成配位化合物而构建了具有物理交联结构的聚氨酯弹性体(Cu-BIMU-LPU)。利用核磁共振氢谱和傅里叶红外光谱对材料结构进行表征,采用动态热机械分析仪和热重分析仪对材料热学性能进行表征,通过升温红外光谱对咪唑脲键的高温解离性进行分析,利用电子万能材料试验机测试材料的力学和自愈合性能,通过循环拉伸试验考察材料弹性。结果表明,合成的Cu-BIMU-LPU具有高拉伸性((1230±93)%)和良好的拉伸强度((7.31±0.98)MPa),在70℃下愈合2 h后恢复了原始拉伸强度的(95.1±2.9)%。之后将Cu-BIMU-LPU作为鞘层材料制备了包裹镓铟锡共熔合金的复合导线。该复合导线切断愈合后,可以在拉伸至原始长度2倍以上时点亮发光二极管,展现了该材料在柔性电子器件领域的良好应用前景。Self-healing polyurethane elastomers(BIMULPU)with linear structures containing dynamic imidazoliumurea bonds(BIMU)were prepared by reacting 2,2-diimidazolylmethane(BIM)and poly(tetrahydrofuran)glycol(PTMG)with isoflurane diisocyanate(IPDI).Introduction of Cu(Ⅱ)into the polymer network of BIMU-LPU constructed a polyurethane elastomer(Cu-BIMU-LPU)with a physical cross-linking structure through the formation of coordination compounds between imidazole and copper ions.The structure of the material was characterized using nuclear magnetic resonance hydrogen spectroscopy and Fourier infrared spectroscopy,the thermal properties of the material were characterized using dynamic thermo-mechanical analyzer and thermogravimetric analyzer,the high-temperature dissociation of imidazolium-urea bonds was analyzed by elevated temperature infrared spectroscopy,the mechanical and self-healing properties of the material were tested using an electronic universal material testing machine,and the elasticity of the material was examined by cyclic tensile tests.The results showed that the synthesized Cu-BIMU-LPU had high tensile((1230±93)%)and good tensile strength((7.31±0.98)MPa),and recovered(95.1±2.9)% of the original tensile strength after healing at 70℃ for 2 h.Composite conductor wrapped with gallium-indium-tin eutectic alloy were subsequently prepared by using Cu-BIMU-LPU as the sheath material.The composite conductor could light up the light-emitting diode when it was stretched to more than two times of the original length after cutting and healing,showing the good application prospect of this material in the field of flexible electronic devices.

关 键 词：自愈合 聚氨酯 配位键 咪唑脲键 弹性体 

分 类 号：O631[理学—高分子化学]