Sun Qian, Gao Xu, Wang Sai, Shao Rong-Yue, Wang Xin-Yu, Su Jun-Feng
School of Information Engineering, Tianjin University of Commerce, Tianjin 300134, China.
School of Material Science and Engineering, Tiangong University, Tianjin 300387, China.
Polymers (Basel). 2022 Dec 30;15(1):190. doi: 10.3390/polym15010190.
The aging and damage of artificial skin materials for artificial intelligence robots are technical problems that need to be solved urgently in their application. In this work, poly (vinylidene fluoride) (PVDF) fibers containing a liquid agent were fabricated directly as biomimetic microvasculars, which were mixed in a glycol-polyvinyl alcohol-gelatin network gel to form biomimetic self-healing artificial skin composites. The self-healing agent was a uniform-viscous buffer solution composed of phosphoric acid, acetic acid, and sodium carboxymethyl cellulose (CMC-Na), which was mixed under 40 °C. Microstructure analysis showed that the fiber surface was smooth and the diameter was uniform. SEM images of the fiber cross-sections showed that there were uniformly distributed voids. With the extension of time, there was no phenomenon of interface separation after the liquid agent diffused into the matrix through the fiber cavity. The entire process of self-healing was observed and determined including fiber breakage and the agent diffusion steps. XRD and FT-IR results indicated that the self-healing agent could enter the matrix material through fiber damage or release and it chemically reacted with the matrix material, thereby changing the chemical structure of the damaged matrix. Self-healing behavior analysis of the artificial skin indicated that its self-healing efficiency increased to an impressive 97.0% with the increase in temperature to 45 °C.
人工智能机器人用人工皮肤材料的老化和损伤是其应用中亟待解决的技术问题。在这项工作中，直接制备了含有液体试剂的聚偏氟乙烯（PVDF）纤维作为仿生微血管，将其混入乙二醇 - 聚乙烯醇 - 明胶网络凝胶中，形成仿生自愈合人工皮肤复合材料。自愈合试剂是由磷酸、乙酸和羧甲基纤维素钠（CMC - Na）组成的均匀粘性缓冲溶液，在40℃下混合。微观结构分析表明，纤维表面光滑且直径均匀。纤维横截面的扫描电子显微镜图像显示有空隙均匀分布。随着时间的延长，液体试剂通过纤维腔扩散到基体中后，没有出现界面分离现象。观察并确定了自愈合的整个过程，包括纤维断裂和试剂扩散步骤。X射线衍射（XRD）和傅里叶变换红外光谱（FT - IR）结果表明，自愈合试剂可通过纤维损伤或释放进入基体材料，并与基体材料发生化学反应，从而改变受损基体的化学结构。人工皮肤的自愈合行为分析表明，随着温度升高到45℃，其自愈合效率提高到了令人印象深刻的97.0%。
