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Thermal cure kinetics of highly branched polyurea resins at different molar ratios

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Abstract

Highly branched polyurea (HBPU) resins have been developed as wood adhesives even though their cure kinetics was not well understood. Here, we report thermal cure kinetics of HBPU resins at three molar ratios (2.0, 2.5, and 3.0), using differential scanning calorimetry. A main endothermic peak at 200–240 °C of HBPU resins was used to calculate their thermal cure kinetics with several model-free kinetics methods such as Friedman (FR), Flynn–Wall–Ozawa (FWO), and Kissinger–Akahira–Sunose (KAS) method. Furthermore, Málek method was also used to predict an optimal reaction model. Thermal curing of HBPU resins changed from chemical-controlled reaction at low molar ratio to diffusion controlled one at high molar ratio, as the molar ratio of HBPU resins increased. FWO method was suitable for calculating the activation energy of 2.0 HBPU resins, while FR method was suitable for 2.5 and 3.0 HBPU resins. Furthermore, Málek method revealed that all of HBPU resins apparently followed autocatalytic reaction model, regardless of molar ratios. In addition, FWO and KAS method was appropriate to predict the reaction model of 2.0 and 3.0 HBPU resins with Málek method.

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Acknowledgements

This research was supported by 2021 Kyungpook National University BK21 FOUR Graduate Innovation Project (International Joint Research Project for Graduate Students). This work was also financially supported by the Program for Leading Talents (no. 2017HA013), the 111 Project (D21027) and the Yunnan Provincial Academician Workstation (YSZJGZZ-2020052).

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Authors and Affiliations

  1. Department of Wood and Paper Science, Kyungpook National University, Daegu, 41566, Republic of Korea

    Seongsu Park & Byung-Dae Park

  2. International Joint Research Center for Biomass Materials, Yunnan Province Key Lab of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming, 650224, China

    Long Yang & Guanben Du

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  1. Seongsu Park
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Park, S., Yang, L., Park, BD. et al. Thermal cure kinetics of highly branched polyurea resins at different molar ratios. J Therm Anal Calorim 148, 6389–6405 (2023). https://doi.org/10.1007/s10973-023-12160-x

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