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Outline
CuS nanoparticles are introduced into a thermoreversible polyurethane based on Diels-Alder （DA） bonds and disulfide bonds，successfully yielding a self-healing polyurethane with five-fold response to thermal，near-infrared light，microwaves，solar light，and UV. When the CuS content is 0.3% （mass fraction），the modified polyurethane achieves optimal comprehensive mechanical properties and self-healing performance. After damage such as cracks or fractures in the modified polyurethane occurs，the material can be restored repeatedly through heat-treated at 120 ℃ for 6 min，irradiated with 4 W/m2 of near infrared light at a wavelength of 808 nm for 60 s，or treated under a 250 W microwave for 80 s，and followed by a heat treatment for 12 h at 60 ℃. In addition，the damaged sample can also be repaired multiply after being treated to a simulated solar light or irradiated through UV for 6 h. The results show that the near-infrared light response offers the quickest self-healing speed，shortest repair time and highest repair efficiency. The self-healing behavior is achieved through the cooperation of thermoreversible DA reaction，disulfide bonds exchange，dissociation and regeneration of hydrogen bonds，directional migration of CuS nanoparticles，and thermal movement of molecular chains. These findings have important guidance for the development of multi-responsive self-healing materials with efficient self-healing capability and provide various ideal selections for damage repair under different environments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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