Jia Yujie, Guan Qingbao, Chu Chengzhen, Zhang Luzhi, Neisiany Rasoul Esmaeely, Gu Shijia, Sun Junfen, You Zhengwei
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Functional Materials, College of Materials Science and Engineering, Research Base of Textile Materials for Flexible Electronics and Biomedical Applications (China Textile Engineering Society), Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Donghua University, Shanghai 201620, China.
Biotechnology Centre, Silesian University of Technology, Gliwice 44-100, Poland; Department of Polymer Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
Sci Bull (Beijing). 2024 Jun 30;69(12):1875-1886. doi: 10.1016/j.scib.2024.03.047. Epub 2024 Mar 26.
There is usually a trade-off between high mechanical strength and dynamic self-healing because the mechanisms of these properties are mutually exclusive. Herein, we design and fabricate a fluorinated phenolic polyurethane (FPPU) elastomer based on octafluoro-4,4'-biphenol to overcome this challenge. This fluorine-based motif not only tunes interchain interactions through π-π stacking between aromatic rings and free-volume among polymer chains but also improves the reversibility of phenol-carbamate bonds via electron-withdrawing effect of fluorine atoms. The developed FPPU elastomer shows the highest recorded puncture energy (648.0 mJ), high tensile strength (27.0 MPa), as well as excellent self-healing efficiency (92.3%), along with low surface energy (50.9 MJ m), notch-insensitivity, and reprocessability compared with non-fluorinated counterpart biphenolic polyurethane (BPPU) elastomer. Taking advantage of the above-mentioned merits of FPPU elastomer, we prepare an anti-fouling triboelectric nanogenerator (TENG) with a self-healable, and reprocessable elastic substrate. Benefiting from stronger electron affinity of fluorine atoms than hydrogen atoms, this electronic device exhibits ultrahigh peak open-circuit voltage of 302.3 V compared to the TENG fabricated from BPPU elastomer. Furthermore, a healable and stretchable conductive composite is prepared. This research provides a distinct and general pathway toward constructing high-performance elastomers and will enable a series of new applications.
通常，高机械强度和动态自修复之间存在权衡，因为这些性能的机制相互排斥。在此，我们基于八氟-4,4'-联苯酚设计并制备了一种氟化酚醛聚氨酯（FPPU）弹性体，以克服这一挑战。这种含氟结构单元不仅通过芳环之间的π-π堆积和聚合物链间的自由体积来调节链间相互作用，还通过氟原子的吸电子效应提高了酚醛-氨基甲酸酯键的可逆性。与非氟化的双酚聚氨酯（BPPU）弹性体相比，所制备的FPPU弹性体具有记录最高的穿刺能量（648.0 mJ）、高拉伸强度（27.0 MPa）以及优异的自修复效率（92.3%），同时具有低表面能（50.9 MJ m）、缺口不敏感性和可再加工性。利用FPPU弹性体的上述优点，我们制备了一种具有自愈合和可再加工弹性基底的防污摩擦纳米发电机（TENG）。由于氟原子比氢原子具有更强的电子亲和力，与由BPPU弹性体制备的TENG相比，这种电子器件表现出302.3 V的超高开路电压峰值。此外，还制备了一种可愈合且可拉伸的导电复合材料。本研究为构建高性能弹性体提供了一条独特且通用的途径，并将带来一系列新的应用。
