多重修复含氟聚氨酯的制备及响应型行为

Preparation and Responsive Behavior of Fluorinated Polyurethane with Multiple Self-Healing

为了改进传统自修复聚氨酯材料修复手段单一以及室温下难以修复等问题,文中以自制端羟基含氟多元醇(FE-OH)、聚四氢呋喃二醇(PTMEG)为软段,异氰酸酯(IPDI)为硬段,胱胺(CM)和4-甲基伞形酮(4-MU)分别为扩链剂和封端剂,以聚吡咯修饰碳纳米管(PPY/CNTs)为光热转换导电助剂,制得可光热修复含氟聚氨酯导电弹性体(CFPU)。通过红外光谱、拉曼光谱等对CFPU结构进行了表征,通过光学显微镜、3D轮廓仪等研究了CFPU的自修复性能,通过接触角测量仪研究了CFPU的疏水性能,通过数字万用表、电化学工作站研究了CFPU的导电性和理化响应性。结果表明,CFPU在室温(25℃)和不同波长光照条件下均具备优良的自修复性能,当PPY/CNTs添加量为25%(CFPU1)时,材料力学性能、疏水性等综合性能最优,且表现出良好的温度及化学环境响应性。该材料在医疗诊断、电子皮肤等领域具备潜在的应用前景。

In order to improve problems of single repair method and difficult to repair at room temperature for traditional self-healing polyurethane material,using self-made hydroxyl-terminated fluorinated polyol(FE-OH),polytetrahydrofuran glycol(PTMEG) as soft segment,isocyanate(IPDI) as hard segment,cystamine(CM) and 4-methylumbelliferone(4-MU) as chain extender and end-capping agent,respectively,and polypyrrole-modified carbon nanometers(PPY/CNTs) as photothermal conversion conductive assistant,fluorine-containing polyurethane conductive elastomers(CFPU) that can be repaired by light and heat were prepared.The structure of CFPU was characterized by infrared spectroscopy(FT-IR),Raman spectroscopy(Raman),etc.,the self-repair performance of CFPU was studied by optical microscope(OM),3D profiler,etc.,and the performance CFPU was studied by contact angle measuring instrument.Hydrophobic performance,the conductivity and physical and chemical responsiveness of CFPU were studied through digital multimeter(DMM) and electrochemical workstation.The results show that CFPUs have excellent self-healing properties under room temperature(25℃) and different wavelengths light conditions;when the addition of PPY/CNTs is 25%(CFPU1),the mechanical properties and hydrophobicity of the material are the best and can show good temperature and chemical environment responsiveness.The material has potential applications in medical diagnosis,electronic skin and other fields.