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The effect of curing temperatures on the thermal behaviour of new polybenzoxazine-modified epoxy resin

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Abstract

In this study, hydroxyl end functional group benzoxazine monomer (BZ-OH) was synthesized from ethanolamine, bisphenol-A and paraformaldehyde. The monomer was analysed and confirmed by Fourier transform infrared, and (1H and 13C) nuclear magnetic resonance techniques, respectively. The benzoxazine (10% by weight) was incorporated into a (50:50) weight ratio of epoxy resin and its hardener. This mixture was first cured at room temperature for 24 h and then post-cured at temperatures; 90, 120, 150, 180, 200 and 220 °C, respectively. Thermal gravimetric analysis was employed to study the effect of the different curing temperatures on the thermal properties of the benzoxazine/epoxy mixture. The results showed an overall improvement in the thermal stability of the samples as the curing temperature is increased. However, the product cured at 220 °C depicted a better thermal behaviour, with a decomposition temperature in the range of 258–532 °C.

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Acknowledgements

This work was supported by the Deanship of Scientific Research (DSR), king Abdulaziz University, Jeddah, under Grant No. (DG-042–130-1440). The authors, therefore, gratefully acknowledge the DSR technical and financial support.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Abdulrahman Musa, Khalid A. Alamry & Mahmoud A. Hussein

  2. Chemistry Department, Assiut University, Synthetic Polymer Lab. 122, Assiut, 71516, Egypt

    Mahmoud A. Hussein

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  1. Abdulrahman Musa
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  2. Khalid A. Alamry
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  3. Mahmoud A. Hussein
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Correspondence to Abdulrahman Musa or Khalid A. Alamry.

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Musa, A., Alamry, K.A. & Hussein, M.A. The effect of curing temperatures on the thermal behaviour of new polybenzoxazine-modified epoxy resin. Polym. Bull. 77, 5439–5449 (2020). https://doi.org/10.1007/s00289-019-03026-0

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  • DOI: https://doi.org/10.1007/s00289-019-03026-0

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