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Studies on thermal properties and curing kinetics of talc-filled epoxy resin composite using differential scanning calorimetry

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Abstract

In this study, thermal properties and curing kinetics of composites based on epoxy resin and talc as safer bio-based filler were investigated by differential scanning calorimetry (DSC). The study revealed that the curing profiles of all epoxy composites with talc were slightly identical with that of neat epoxy. Initial curing temperatures and curing rates of all composites were lower than that of neat epoxy. The glass transition temperature (Tg) of the neat epoxy and its composites was also studied using DSC and found at (95, 94.4, 86.5, and 86.6 °C, for pure epoxy, epoxy/talc: 10%, 20%, and 30 wt%, respectively). Kinetic parameters such as activation energy (Eα), pre-exponential factor (A), and curing temperatures at four different heating rates (10, 15, 20, and 25 °C/min) were also evaluated by means of two isoconversional models, namely Kissinger and Ozawa methods. The results obtained by both models showed that the composites have smooth and single exothermic peak which occurs in the same temperature range correspond to that of neat epoxy as well as comparable kinetics parameters. The obtained activation energy values for curing of epoxy with different talc contents calculated by two methods were ranging from 50 to 65 kJ/mol., while the typical value of the neat epoxy resins is 45 kJ/mol. Furthermore, all curing enthalpy values of composites were (127–140 J/g) and lower per the normal range for curing enthalpy of neat epoxy systems (148 J/g). Finally, it was proved that the incorporation of talc in epoxy resin allows manufacturing low-cost composite with acceptable thermal and curing properties.

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Acknowledgements

The author gratefully acknowledges Dr. Mohamed Ali Jabber, the head of polymer research center, university of Basrah and also Dr. Ziyad Tareq Al-maliki, a researcher at this institute for their help during carried out this project especially for DSC analysis.

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  1. Polymer Research Center, University of Basrah, Basrah, Iraq

    Hussein Ali Shnawa

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Shnawa, H.A. Studies on thermal properties and curing kinetics of talc-filled epoxy resin composite using differential scanning calorimetry. Polym. Bull. 79, 11461–11478 (2022). https://doi.org/10.1007/s00289-021-04012-1

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