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<p>The present work delineates with the kinetic and thermodynamic assessment of 2-oxazolidone modified novolac epoxy film adhesive using differential scanning calorimetry (DSC) under isothermal condition at different temperatures viz<i>.</i> 428, 433, 438 and 443&#xa0;K. Effect of polyethersulfone (PES) as a thermoplastic toughening agent, on the isothermal curing reaction of film adhesive is also studied. Kinetic parameters of its curing reaction are derived using Kamal’s equation, integral and differential model-free-isothermal isoconversional methods. Prediction of curing behavior attempted at the experimental temperatures for comparison and additionally at two unknown temperatures, <i>i.e.,</i> 423 and 448&#xa0;K. Later, predictions done by three methods are compared with experimentally obtained data and estimated the prediction capability. Among the three methods, the prediction via Kamal’s modeling is the best and it is within ± 10% at 423 and 448&#xa0;K. Subsequently, the rate constants deduced from Kamal’s model are used to compute the thermodynamic parameters for the activated state of curing process, via absolute reaction rate theory proposed by Eyring.</p>

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Isothermal cure kinetics and thermodynamics of 2-oxazolidone modified novolac epoxy film adhesive

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Ranajit Pal,
  • P. B. Soumyamol,
  • Rajeev Raghavan

摘要

The present work delineates with the kinetic and thermodynamic assessment of 2-oxazolidone modified novolac epoxy film adhesive using differential scanning calorimetry (DSC) under isothermal condition at different temperatures viz. 428, 433, 438 and 443 K. Effect of polyethersulfone (PES) as a thermoplastic toughening agent, on the isothermal curing reaction of film adhesive is also studied. Kinetic parameters of its curing reaction are derived using Kamal’s equation, integral and differential model-free-isothermal isoconversional methods. Prediction of curing behavior attempted at the experimental temperatures for comparison and additionally at two unknown temperatures, i.e., 423 and 448 K. Later, predictions done by three methods are compared with experimentally obtained data and estimated the prediction capability. Among the three methods, the prediction via Kamal’s modeling is the best and it is within ± 10% at 423 and 448 K. Subsequently, the rate constants deduced from Kamal’s model are used to compute the thermodynamic parameters for the activated state of curing process, via absolute reaction rate theory proposed by Eyring.