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  • 1 Maria Curie-Skłodowska University Faculty of Chemistry, Department of Polymer Chemistry and Technology Lublin Poland 20-614 Gliniana 33 street
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Abstract  

In this paper, the non-isothermal differential scanning calorimetry (DSC) was employed to investigate the cure process and to determine the kinetic parameters of the curing reaction of the unsaturated polyester resin catalyzed with promoter-cobalt(II)octoate and free-radical initiators. The initiators were formed by the oxidation process of acetylacetone with 60% hydrogen peroxide in the presence of the catalyst-sulphuric acid and the solvents: propano-1,2-diol or the mixture of propano-1,2-diol and hydroxypolyether TG 500. As a reference, the typical curing system containing ethyl methyl ketone hydroperoxide (Luperox) and promoter was used. It was found that the cure process of the unsaturated polyester resin with the new initiators/cobalt(II)octoate was described through lower maximum peak temperatures (Tmax) and lower values of the total heat of the curing reaction (ΔHR) in comparison with Luperox/cobalt(II)octoate. The computed values of activation energies were in the range of 40.8–44.9 and 80.4–87.6 kJ mol–1 for unsaturated polyester resin cured with the new initiators/cobalt(II)octoate. The values of activation energies were little lower or comparable to those obtained when Luperox/cobalt(II)octoate system was used (45.8 and 82.3 kJ mol–1).