Abstract: ［Objective］In this paper，the thermal conductivity of flexible polymers was improved and the flexible polymers were applied to the field of high-performance flexible electronics.［Methods］ Flexible thermal conductive composites were prepared by incorporating highly thermalconductive Ti₃C₂ nanosheets into a low-modulus（0. 8 MPa） polyurethane elastomer，achieving the balance of thermal conductivity and flexibility.［Results］Benefiting from the interfacial interactionsbetween the fluorine and hydroxyl groups on the surface of Ti₃C₂ nanosheets and the polymer matrix， high filler loading of Ti₃C₂ was achieved，and the mechanical properties of composites were significantly enhanced. The tensile toughness of the composite filled with the 7% Ti₃C₂ reached 13. 44 MJ/m³. Simultaneously，the interfacial interactions facilitated the mobility of Ti₃C₂，which made the composites have a 24 h mechanical self-healing efficiency up to 96. 7%，a thermal conductivity of 1. 45 W/（m·K）， and excellent flexibility.［Conclusion］The prepared room-temperature self-healing flexible thermal conductive Ti3C2/polyurethane composites showed promising application potential in the flexible thermal management field.

Key words: polyurethane, Ti₃C₂, self-healing, thermal management

摘要： 【目的】提高柔性聚合物的导热性并将其应用于高性能柔性电子领域。【方法】将高导热性的 Ti₃C₂纳米片填充到低模量（ 0. 8 MPa）聚氨酯弹性体中，制备柔性导热复合材料，实现导热性与柔韧性的平衡。【结果】得益于 Ti₃C₂纳米片表面的氟、羟基基团与聚合物间界面相互作用，实现了 Ti₃C₂纳米片较高填充量，复合材料力学性能得到较大提升，填充 7% Ti₃C₂的复合材料拉伸韧性达到 13. 44 MJ/m³具备优异的柔韧性，同时界面作用促进了 Ti₃C₂运动，复合材料 24 h力学性能自修复效率达 96. 7%，导热系数为，1. 45 W/（m·K）。【结论】自制的室温自修复柔性导热 Ti₃C₂/聚氨酯复合材料在柔性热管理领域表现出较好的应用前景。

关键词: 聚氨酯, Ti₃C₂, 自修复, 热管理

CLC Number: 

• TQ635. 9