Fan Ting, Xue Shan-Shan, Zhu Wei-Bin, Zhang Yuan-Yuan, Li Yuan-Qing, Chen Zhen-Kun, Huang Pei, Fu Shao-Yun
College of Aerospace Engineering, Chongqing University, Chongqing 400044, People's Republic of China.
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, People's Republic of China.
ACS Appl Mater Interfaces. 2022 Mar 23;14(11):13778-13789. doi: 10.1021/acsami.2c01837. Epub 2022 Mar 8.
Herein, a multifunctional polyurethane (PU) composite foam with a hierarchical structure is fabricated by dip-coating a carbon nanotube/shear-thickening gel (CNT/STG) and spray-coating nano-SiO/STG on PU foam. The prepared nano-SiO/CNT/STG@PU (SCS@PU) composite foam is lightweight, highly compressive, electrically conductive, superhydrophobic, and impact-energy absorptive. As a result, it possesses an excellent sensing ability to compression with a stable response up to 80% strain, an outstanding linearity of > 0.99, and a wide response frequency of 0.01 to 1 Hz; it can also be used for effectively detecting impact force and sensing various human motions. Moreover, the superhydrophobicity with a water contact angle up to 154° of SCS@PU composite foam endows it with an excellent resistance to hazardous liquids (strong acid and alkali) to ensure its service reliability under harsh circumstances. In particular, the SCS@PU exhibits an outstanding anti-impact capability with an impact force attenuation rate of SCS@PU as high as 81%. Finally, its applications as soft body armors are demonstrated in protecting a wearer wearing a helmet with the SCS@PU as liner and using the SCS@PU as a smart kneecap against impact. On consideration of its excellent strain-sensing ability, superhydrophobicity, and outstanding anti-impact capability, the multifunctional SCS@PU composite foam developed is promising for personal safety protection.
在此，通过将碳纳米管/剪切增稠凝胶（CNT/STG）浸涂在聚氨酯（PU）泡沫上，并将纳米SiO/STG喷涂在PU泡沫上，制备了一种具有分级结构的多功能聚氨酯（PU）复合泡沫。制备的纳米SiO/CNT/STG@PU（SCS@PU）复合泡沫重量轻、抗压性高、导电、超疏水且具有冲击能量吸收能力。因此，它对压缩具有出色的传感能力，在高达80%应变时响应稳定，线性度大于0.99，响应频率范围为0.01至1Hz；它还可用于有效检测冲击力并感知各种人体运动。此外，SCS@PU复合泡沫的水接触角高达154°的超疏水性使其具有优异的耐危险液体（强酸和强碱）性能，以确保其在恶劣环境下的使用可靠性。特别是，SCS@PU表现出出色的抗冲击能力，SCS@PU的冲击力衰减率高达81%。最后，展示了其作为软体装甲的应用，即使用SCS@PU作为内衬保护佩戴头盔的人员，并将SCS@PU用作智能护膝以抵御冲击。鉴于其出色的应变传感能力、超疏水性和出色的抗冲击能力，所开发的多功能SCS@PU复合泡沫在个人安全防护方面具有广阔前景。
