Abstract: ［Objective］ To enhance the mechanical strength of self-healing polyurethane containing disulfide bonds，a high-strength and high-resilience self-healing polyurethane elastomer（PU）based on disulfide bonds and multiple hydrogen bonds was prepared.［Methods］A prepolymer was first prepared by the reaction of polytetrahydrofuran（PTEMG） with isophorone diisocyanate（IPDI）. The prepolymer was then further reacted with 4，4'-diaminodiphenyl disulfide（4-AFD）to synthesize an intermediate. Finally，the intermediate reacted with isophthalic dihydrazide（IPDH）to form polyurethane（PU）. The influence of the molar ratio of soft and hard segment monomers on theproperties of PU was investigated. The products were characterized using Fourier transform infraredspectroscopy（FT-IR）， X-ray diffraction（XRD）， thermogravimetric analysis（TG）， and differential scanning calorimetry（DSC）.［Results］The polyurethane with a molar ratio of soft segments（PTEMG）to hard segments（including IPDI，4-AFD，and IPDH monomers） of 2.5（PU2. 5） possessed goodhardness and resilience. It exhibited a self-healing efficiency of 54% at 80 ℃ . Moreover，the self-healed PU2. 5 exhibited high elongation at break（827%）and tensile strength（8 MPa）.［Conclusion］ The synthesized polyurethane elastomer exhibited good self-healing and mechanical properties.

Key words: polyurethane, disulfide bond, hydrogen bond, self-healing

摘要： 【目的】提高含二硫键的自修复聚氨酯的力学强度，制备了一种基于二硫键和多重氢键的高强度、高回弹的自修复聚氨酯弹性体（PU）。【方法】首先通过聚四氢呋喃（PTMEG）与异佛尔酮二异氰酸酯反应制备预聚物，再与 4，4'-二氨基二苯二硫醚（ 4-AFD）反应生成中间体，最后与间苯二甲酸二酰肼（ IPDH）反应合成聚氨酯（ PU）。探究了软硬段单体物质的量比对 PU性能的影响，并采用傅立叶变换红外光谱仪（ FT-IR）、 X射线衍射仪（ XRD）、热重分析仪（ TG）、差示扫描量热仪（ DSC）对产物进行了测试与表征。【结果】软段（ PTMEG）与硬段（含 IPDI、4-AFD、IPDH三单体）物质的量比为 2. 5时制备的聚氨酯（ PU2. 5）具有较好的硬度和回弹性，在 80 ℃条件下呈现出 54%的自修复效率，且自修复后的 PU2. 5显示了较高的断裂伸长率（827%）和拉伸强度（8 MPa）。【结论】制备的聚氨酯弹性体具有好的自修复性和力学性能。

关键词: 聚氨酯, 二硫键, 多重氢键, 自修复

CLC Number: 

• TQ635. 9