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<p>Polypropylene (PP) film has been widely used in the packaging industry for its excellent overall performance. However, due to its low recycling value, it is usually discarded, flowing into the environment and causing serious environmental pollution and resource waste. Herein, a new and green recycling strategy was provided for large-scale and high-value reuse of waste PP packaging film, i.e., obtaining waste PP active powder from film via our novel solid-state shear milling (S<sup>3</sup>M) technology, then preparing high-performance PP-based foam triboelectric nanogenerators with the assistance of elastomer-olefin block copolymer (OBC) by adopting supercritical carbon dioxide (Sc-CO<sub>2</sub>) foaming technology. The studies on foaming behavior and cell structure indicated that the introduction of OBC greatly improved the rupture problem of PP cell caused by its low melt strength. And the obtained PP/OBC foam presented good resilience as well as excellent triboelectric properties. Its residual strain was only 0.88%. When the linear motor acceleration was 15&#xa0;m/s<sup>2</sup>, it could produce a triboelectric output of up to 86.9&#xa0;V and 1.54&#xa0;μA, powering 58 LED bulbs and charging a commercial capacitor of 1&#xa0;μF–6.8&#xa0;V in 100&#xa0;s, thus exhibiting a good application prospect in green energy storage, for example, charging the battery for new energy vehicles or other electronic products.</p>

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Fabrication of green triboelectric nanogenerator from waste PP films with the assistance of OBC via supercritical carbon dioxide foaming technology

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Wu Guo,
  • Jian Yang,
  • Zhidong Liu,
  • Li Li

摘要

Polypropylene (PP) film has been widely used in the packaging industry for its excellent overall performance. However, due to its low recycling value, it is usually discarded, flowing into the environment and causing serious environmental pollution and resource waste. Herein, a new and green recycling strategy was provided for large-scale and high-value reuse of waste PP packaging film, i.e., obtaining waste PP active powder from film via our novel solid-state shear milling (S3M) technology, then preparing high-performance PP-based foam triboelectric nanogenerators with the assistance of elastomer-olefin block copolymer (OBC) by adopting supercritical carbon dioxide (Sc-CO2) foaming technology. The studies on foaming behavior and cell structure indicated that the introduction of OBC greatly improved the rupture problem of PP cell caused by its low melt strength. And the obtained PP/OBC foam presented good resilience as well as excellent triboelectric properties. Its residual strain was only 0.88%. When the linear motor acceleration was 15 m/s2, it could produce a triboelectric output of up to 86.9 V and 1.54 μA, powering 58 LED bulbs and charging a commercial capacitor of 1 μF–6.8 V in 100 s, thus exhibiting a good application prospect in green energy storage, for example, charging the battery for new energy vehicles or other electronic products.