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Catalytic liquefaction of starch by sulfamic acid and its curing kinetics for preparing polyurethane

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Abstract

In this paper, starch was first liquefied using sulfamic acid as catalyst, and then the starch-based polyurethane coating was prepared. The optimum ratio between the hydroxyl group of liquefied starch and isocyanate group of PM200 was determined to be 1:1.3. Differential scanning calorimetry was used to study the curing reaction kinetics of starch-based polyurethane, and the result showed that the initial temperature (Ti), peak temperature (Tp) and end temperature (Tf) of thermostatic curing reaction were 23.31 °C, 83.15 ℃ and 199.75 ℃, respectively. According to the Kissinger model, the calculated activation energy and preexponential factor of the curing reaction system were 44.34 kJ mol−1 and 7.36 × 103 s−1, respectively. Meanwhile, the Crane model indicated that the order of curing reaction was 0.88. The curing kinetic equation was also established to provide a theoretical basis for the actual curing process of starch-based polyurethane materials.

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Acknowledgements

This work was supported by the Natural Science Foundation of Hunan Province, China (2022JJ30487 and 2021JJ40447); the National Natural Science Foundation of China (12005095); the Research and Innovative Experiment Program for College Students in Hunan Province, China (S202210555140, D202305181322005416 and D202305181316028509); the Project of Young Backbone Teacher of Hunan Province, China (221RQG004)

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Authors and Affiliations

  1. School of Nuclear Science and Technology, University of South China, Hengyang, 421001, Hunan, China

    Yuxiang Zhou, Hang Tian & Meng Wang

  2. School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, Hunan, China

    Zihang Mei & Yun Liao

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  1. Yuxiang Zhou
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  2. Hang Tian
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  3. Zihang Mei
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  4. Yun Liao
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  5. Meng Wang
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Contributions

All authors contributed to the study conception and design. Catalytic liquefaction of starch by sulfamic acid was performed by YZ, HT and MW. Curing kinetics of starch-based polyurethane were performed by ZM and YL. The first draft of the manuscript was written by YL, and all authors commented and revised previous versions of the manuscript. All authors read and approved the final manuscript. Supervision was performed by YL and MW.

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Correspondence to Yun Liao or Meng Wang.

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Zhou, Y., Tian, H., Mei, Z. et al. Catalytic liquefaction of starch by sulfamic acid and its curing kinetics for preparing polyurethane. J Therm Anal Calorim 148, 13851–13858 (2023). https://doi.org/10.1007/s10973-023-12615-1

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  • DOI: https://doi.org/10.1007/s10973-023-12615-1

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