纳米Fe_(3)O_(4)改性热可逆聚氨酯的多重响应自修复行为

Multi-Responsive Self-Healing Behavior of Thermo-Reversible Polyurethane Modified with Fe_(3)O_(4) Nanoparticles

通过将Fe_(3)O_(4)纳米粒子引入基于Diels-Alder反应的热可逆聚氨酯,制备了一种具有热、近红外光、微波等多重响应行为的自修复聚氨酯材料。研究发现,纳米Fe_(3)O_(4)的引入未对聚氨酯的结构和热可逆性产生明显影响,相反显著改善了热可逆聚氨酯的力学性能和自修复性能。当Fe_(3)O_(4)纳米粒子的质量分数为0.3%时,获得的聚氨酯的力学性能最优。同时,纳米Fe_(3)O_(4)的引入极大地提高了热可逆聚氨酯的修复效率,并赋予热可逆聚氨酯既可通过热处理实现损伤的自修复,也可通过近红外光激发实现损伤的自修复。而且,相对于热修复,近红外光修复具有更快的修复速率和更高的修复效率,并且可实现材料的多次重复修复。这些研究对实现材料的多重响应自修复和回收再利用具有重要的参考价值。

A new kind of self-healing polyurethane with multi-responses as heat,near-infrared light(NIR),and microwave was synthesized successfully via introducing Fe_(3)O_(4) nanoparticles into Diels-Alder(DA) reaction-based thermo-reversible self-healing polyurethane(PU-DA).Results show that the introduction of Fe_(3)O_(4) nanoparticles has no influence on the structure and thermal reversibility of PU-DA.On the contrary,the mechanical properties and selfhealing performance were improved greatly.The resultant polyurethane obtained optimal mechanical properties when the mass fraction of the introduced Fe_(3)O_(4) nanoparticles is 0.3%.Meanwhile,the introduction of Fe_(3)O_(4) nanoparticles not only improves the healing efficiency of thermo-reversible polyurethane markedly,but also endows polyurethane with both heat and NIR self-healing ability.Moreover,as compared to the heat repair,much quicker repair speed and higher self-healing efficiency could be reached via NIR irradiation.On the other hand,the resultant materials could be repaired repeatedly.These studies have important reference value for realizing the multi-responsive self-healing and recycling of materials.