Polypyrrole-polyurethane (PPy-PU) porous materials have been widely used in the research of flexible stress/strain sensors. However, it is inevitable on material damage in the process of force sensing, and it is still a great challenge to prepare a flexible porous sensor with non-contact self-healing performance. In this study, we prepared a non-contact photothermal self-healing PPy-PU porous material containing a reversible oxime urethane bond and polypyrrole, and further packaged it into a porous sensor for strain sensing detection. The obtained PPy-PU porous material has excellent breaking elongation and breaking strength. Benefit from the excellent photothermal conversion of polypyrrole, the maximum surface temperature of the PPy-PU porous material can reach above 110 °C at 1.5-sun that is the required temperature for the cleavage and reorganization of the oxime carbamate bonds in the PU matrix, and the fracture strength of PPy-PU porous material can be restored to more than 85% after self-healing at 1.5-sun for 1 h. The most important is that the self-healing PPy-PU porous sensor can still sensitively detect strain in the range of 1%–10%. Finally, we show the application of the photothermal self-healing PPy-PU porous sensor in the field of human micro-motion, indicating its potential for human physiological monitoring and artificial intelligence.
Yangkai Xiong,Zhiqiang Fang,Panpan Tang,Yu Li,Hao Jiang,Jipeng Li,Zheng Li,Guoqing Wang
Biological fouling is a considerable threat to the marine industry because attached microcontaminants and microorganisms inflict serious damage on marine installations and aquacultures. Although there has been tremendous effort in researching marine antifouling, it is yet challenging to develop a long-term and consistent antifouling strategy and materials. Here, polyhexamethylene-biguanide (PHMB) and MXene are introduced into the carboxylated cellulose nanofibers (CNF) reinforced polyvinyl alcohol (PVA) hydrogel to obtain a self-healing and ultra-high toughness antifouling hydrogel. The as-prepared double network (DN) hydrogels have extremely high toughness (16,050 kJ/m 3 ), superior anti-protein adhesion (100 %) and anti-algal adhesion (100 %), exceptional antibacterial activity (99.97 %), and remarkable photothermal self-healing capability. Furthermore, the DN hydrogel provide outstanding antifouling performance for at least six months in the actual marine field. This work provides an effective and feasible strategy to prevent marine biofouling and also initiates new approaches to the application of hydrogel.
危险品化学品经营许可证（带存储）