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Polypyrrole-functionalized g-C3N4 for rheological, combustion and self-healing properties of thermoplastic polyurethane

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Abstract

It is a challenge to manufacture multifunctional, two-dimensional, nanosized additive for polymer by a simple and universal method. Herein, a phytic acid-doped polypyrrole shell was successfully grown on the surface of exfoliated g-C3N4 nanosheets (CNPPy) by an in-situ polymerization method. CNPPy was directly incorporated into thermoplastic polyurethane (TPU) to prepare multifunctional TPU nanocomposites with near-infrared (NIR) induced self-healing properties. Rheological analysis showed that the combination of carbon nitride and polypyrrole formed a stable network in the TPU matrix. Compared to pure TPU, the incorporation of 3 wt% CNPPy into TPU exhibited 43.4% lower peak heat release rate and 53.4% lower peak smoke release rate. In addition, the mechanical performance of the CNPPy-TPU nanocomposite remain basically unchanged. Meanwhile, the tensile strength of a cut composite was restored to 31.3% in 45 s via NIR. The strategy of in-situ polymerization of conjugated polymers on the surface of two-dimensional nanosheets enables polyurethane composites with both improved rheological and self-healing properties and broadens the application field of two-dimensional nanosheets.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2017YFB0308600).

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Authors and Affiliations

  1. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, People’s Republic of China

    Shaolin Lu, Haixian Shi, Botao Shen, Wei Hong, Dingshan Yu & Xudong Chen

Authors
  1. Shaolin Lu
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  2. Haixian Shi
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  3. Botao Shen
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  4. Wei Hong
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  5. Dingshan Yu
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  6. Xudong Chen
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Contributions

Shaolin Lu: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing–original draft. Haixian Shi: Resources, Investigation. Botao Shen: Resources, Data curation. Wei Hong: Writing–review & editing, Visualization, Supervision. Dingshan Yu: Writing–review & editing. Xudong Chen: Writing–review & editing, Supervision.

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Correspondence to Xudong Chen.

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Lu, S., Shi, H., Shen, B. et al. Polypyrrole-functionalized g-C3N4 for rheological, combustion and self-healing properties of thermoplastic polyurethane. J Polym Res 29, 263 (2022). https://doi.org/10.1007/s10965-022-03046-x

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