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Tuning the Properties of Bio-based Thermoplastic Polyurethane Derived from Polylactic Acid by Varying Chain Extenders and Hard Segment Contents

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Abstract

Currently, the preparation and application of bio-based thermoplastic polyurethane (TPU) are hot research topics in the field of polyurethane. In the present work, a series of polylactic acid (PLA)-based TPUs were synthesized using bio-based PLA and 4,4’-methylene diphenyl diisocyanate (MDI). The effects of three chain extenders, including 1,3-propanediol (PDO, PD), 1,4-butanediol (BDO, BD), and 1,6-hexanediol (HDO, HD), on the characteristics and properties of PLA-based TPUs were investigated. The successful synthesis of PLA-based TPUs was confirmed by the absence of isocyanate groups and the presence of characteristic peaks corresponding to urethane and other functional groups. The analyses revealed the potential for greater crystallization in the PLA-BD and PLA-HD series. Among the examined groups, the PLA-HD variant with a 55% hard segment content displayed the highest molecular weight and fracture stress, and an appropriate elongation value, indicating its suitability for specific applications. The study also investigated the stress relaxation rates and residual forces and found them to be within clinically acceptable ranges. These findings demonstrate the potential of these synthesized TPUs for orthodontic applications, with the ability to tailor mechanical properties by adjusting hard segment contents and modifying chain extenders.

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Acknowledgements

This research received funding from the University System of Taipei Joint Research Program, Taiwan, under grant number USTP-NTUT-TMU-112-07.

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Author notes

  1. Pei-Wen Peng and Yi-Huan Lee were the co-first authors.

Authors and Affiliations

  1. School of Dental Technology, Taipei Medical University, Taipei, Taiwan

    Pei-Wen Peng & Wei-Fang Lee

  2. Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan

    Yi-Huan Lee & Yao-Yi Cheng

  3. Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, Taiwan

    Yi-Huan Lee, Lyu-Ying Wang, Yong-Wei Zhan, Zhi-Yu Chen & Yao-Yi Cheng

  4. School of Dentistry, Taipei Medical University, Taipei, Taiwan

    Wei-Fang Lee

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Contributions

Conceptualization, P.-W. P., Y.-H. L., W.-F. L. and Y.-Y. C.; methodology, P.-W. P., Y.-H. L., W.-F. L. and Y.-Y. C; data curation, L.-Y. W., Y.-W. Z. and Z.-Y. C.; validation, P.-W. P., Y.-H. L., W.-F. L. and Y.-Y. C., writing-original draft preparation, P.-W. P.; writing-review and editing, P.-W. P., Y.-H. L., L.-Y. Wang and Y.-Y. C.; visualization, L.-Y. W. and Y.-W. Z.; supervision, P.-W. P., Y.-H. L., W.-F. L. and Y.-Y. C.; funding acquisition, P.-W. P. and Y.-Y. C. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Wei-Fang Lee or Yao-Yi Cheng.

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Peng, PW., Lee, YH., Wang, LY. et al. Tuning the Properties of Bio-based Thermoplastic Polyurethane Derived from Polylactic Acid by Varying Chain Extenders and Hard Segment Contents. J Polym Environ (2024). https://doi.org/10.1007/s10924-023-03183-4

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