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<p>For room temperature self-healing triboelectric nanogenerators (TENGs), the inherent contradiction between mechanical strength and self-healing properties was an urgent problem to be solved. Based on the phenol-carbamate bond, this paper proposed a strategy to design a new molecular structure and coordinate the triple dynamic bonds, which provided a feasible strategy to solve this contradiction. With polytetramethylene ether glycol (<i>M</i><sub>n</sub> = 1,000) as the soft segment in the main chain of polyurethane (PU), meanwhile methylene diphenyl diisocyanate and 4,4′-dihydroxybiphenyl (BP) as the hard segment and chain extension agent, respectively, the combination of tetrad benzene ring endowed the resultant 4BP-PU with π-π interaction. The effective reversible dissociation and association with hydrogen bond not only bestowed 4BP-PU with high mechanical strength (16.14 MPa), but also promoted high self-healing efficiency (94.8%) at room temperature. 4BP-PU was selected as the elastic substrate between polydimethylsiloxane and copper sheet to prepare a self-healing TENG to collect energy from natural motion. Consequently, the rational molecular structure design provided new ideas for developing self-healing materials and fabricating energy harvest electronics.</p>

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Multiple dynamic bonds enable high mechanical strength and efficient room-temperature self-healable polyurethane for triboelectric nanogenerators

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Wenwen Zhang,
  • Huixia Xuan,
  • Xiaofei Xu,
  • Jiaming Lou,
  • Qingbao Guan,
  • Zhengwei You

摘要

For room temperature self-healing triboelectric nanogenerators (TENGs), the inherent contradiction between mechanical strength and self-healing properties was an urgent problem to be solved. Based on the phenol-carbamate bond, this paper proposed a strategy to design a new molecular structure and coordinate the triple dynamic bonds, which provided a feasible strategy to solve this contradiction. With polytetramethylene ether glycol (Mn = 1,000) as the soft segment in the main chain of polyurethane (PU), meanwhile methylene diphenyl diisocyanate and 4,4′-dihydroxybiphenyl (BP) as the hard segment and chain extension agent, respectively, the combination of tetrad benzene ring endowed the resultant 4BP-PU with π-π interaction. The effective reversible dissociation and association with hydrogen bond not only bestowed 4BP-PU with high mechanical strength (16.14 MPa), but also promoted high self-healing efficiency (94.8%) at room temperature. 4BP-PU was selected as the elastic substrate between polydimethylsiloxane and copper sheet to prepare a self-healing TENG to collect energy from natural motion. Consequently, the rational molecular structure design provided new ideas for developing self-healing materials and fabricating energy harvest electronics.