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Effect of chain extenders on the thermal and thermodegradation behavior of carbonatodiol thermoplastic polyurethane

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Abstract

In this study, we investigated the impact of chain extenders with varying numbers of carbon atoms (2–6) on the thermal degradation behavior of thermoplastic polyurethanes based on diol carbonate (TPU) in air and nitrogen atmospheres. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were utilized to evaluate phase separation and thermal degradation, respectively. The experimental data provided valuable insights into the thermal degradation of TPUs and the mechanisms involved in the process. In addition, the physical/chemical nature of the process was considered when explaining the degradation mechanisms. Our results showed that the 4-carbon chain extender exhibited a longer average degradation time than the other chain extenders due to the stabilization of the urethane bond, as confirmed by both ANSI/ASTM D-2307 and the artificial neural network (ANN). Using the isoconversional method and an ANN approach, we obtained reliable kinetic data that allowed us to predict the materials’ endurance time and thermal degradation behavior by constructing a dedicated network. This proposed methodology can be applied to other materials and characterization techniques, provided sufficient data is available. Overall, this study contributes to a better understanding of the thermal degradation behavior of TPUs and provides insights that can help develop more robust and durable materials for various applications.

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Acknowledgements

OB thanks for the financial support from National Council for Scientific and Technological Development (CNPq) fellows (grant numbers 308567/2018-8 and 305814/2021-4). CMG thanks UBE Chemical Europe for partial financial help and for supplying polycarbonate diol samples.

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Authors and Affiliations

  1. Department of Materials Engineering (DEMAT), Federal University of Rio Grande do Sul (UFRGS), RS, Porto Alegre, Brazil

    Otávio Bianchi

  2. Mantoflex Indústria de Plásticos Ltda, RS, Caxais do Sul, Brazil

    Heitor Luiz Ornaghi

  3. R&D Department UBE Corporation Europe, S.A., 12100, Castellon, Spain

    Andrés Nohales

  4. Instituto de Ciencia de los Materiales, Universidad de Valencia, 46980, Paterna, València, Spain

    Manuel Asensio & Clara M. Gómez

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  1. Heitor Luiz Ornaghi
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  2. Andrés Nohales
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  3. Manuel Asensio
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  4. Clara M. Gómez
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  5. Otávio Bianchi
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Contributions

Data curation, investigation, methodology, HLO; data curation, methodology, AN; conceptualization, writing—review and editing, investigation, MA; writing—review and editing, investigation, CMG; conceptualization, writing—review and editing, supervision, funding acquisition, OB. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Clara M. Gómez or Otávio Bianchi.

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Ornaghi, H.L., Nohales, A., Asensio, M. et al. Effect of chain extenders on the thermal and thermodegradation behavior of carbonatodiol thermoplastic polyurethane. Polym. Bull. 81, 2267–2286 (2024). https://doi.org/10.1007/s00289-023-04812-7

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