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Non-isothermal cure and decomposition kinetics of hydroxyl and propargyl functional poly (ether ether ketone): epoxy resins

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Abstract

This paper presents the cure behavior and decomposition kinetics of epoxy resins incorporated with hydroxyl functionalized poly (ether ether ketone)s (PEEKTOH) and propargyl telechelic poly(ether ether ketone)s (PEEKPR). PEEKTOH and PEEKPR were blended with diglycidyl ether of bisphenol A (DGEBA) resin. The unmodified DGEBA without any PEEK modifier was also processed and evaluated for comparison. 4, 4′diamino diphenylsulfone was used as the curing agent for the blends. Non-isothermal cure kinetics was derived by differential scanning calorimetry, and the kinetic parameters including activation energy, pre-exponential factor and rate constant were determined. The cure initiation temperature was significantly influenced by the composition of the blend. Neat epoxy system without any modifier showed a cure initiation temperature in the range of 130–150 °C for different heating rates studied. PEEKTOH and PEEKPR modified epoxies exhibited cure initiation in the range of 118 to 145 °C and 121–149 °C, respectively, for different heating rates. Activation energies, Ea, at various extents of curing conversion were derived by Kissinger–Akahira–Sunose (KAS) method. The highest average activation energy range was exhibited by EP-Neat in the range of 77–80 kJ mol−1, whereas the EP-PEEKTOH showed Ea in the range of 66–70 kJ mol−1. Cured systems were subjected to thermal decomposition by thermogravimetric analysis. The activation energy for different extents of decomposition was studied by KAS method. The PEEKPR blended epoxy exhibited the highest values of activation energy for the entire range of decomposition, whereas the PEEKTOH system exhibited the lowest values.

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Acknowledgements

The authors thank Director, VSSC, for granting permission to publish this work. They also thank Analytical and Spectroscopy Division, Vikram Sarabhai Space Centre (ISRO), for the support in characterization and testing of the materials.

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Authors and Affiliations

  1. Polymers and Special Chemicals Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, Kerala, India

    Leena Karthikeyan, Drisya Desakumaran & Dona Mathew

  2. Analytical and Spectroscopy Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, Kerala, India

    Panthaplackal Bhaskaran Soumya Mol

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  1. Leena Karthikeyan
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Karthikeyan, L., Desakumaran, D., Mol, P.B.S. et al. Non-isothermal cure and decomposition kinetics of hydroxyl and propargyl functional poly (ether ether ketone): epoxy resins. J Therm Anal Calorim 147, 6793–6805 (2022). https://doi.org/10.1007/s10973-021-11007-7

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