Thermal Effects of Cure Reaction for an Unsaturated Polyester in Cylindrical Moulds

V. Kosar and Z. Gomzi

Abstract
The cure of unsaturated polyester was studied by using experiments and a model of the process.The kinetic parameters were calculated from the heat flow rate – time curves obtained by differential scanning calorimetry (DSC, Netzsch – Simultaneous Thermal Analyser DSC 200), working in DC (isothermal) and DSC (dynamic) mode.The temperature – time histories were studied in moulds of cylindrical shape. The numerical model was constructed by taking into account the heat transferred by conduction through the resin, as well as the kinetics of heat, generated by cure reaction. The contributions to the rise in temperature from heat conduction and chemical reaction are different in different parts of the composite, and can explain the temperature, or conversion – time histories. By considering the reaction-cure – time, temperature – time and heat flow rate – time histories developed within the sample, more extensive knowledge of the process can be obtained.The effect of the conduction heat transfer through the composite, as well as the internal heat generated by the cure reaction, is clearly shown, despite the complexity of the process. Finally, the good agreement between experimental data and predicted mathematical model of the curing process in cylindrical mould, was shown.

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Keywords
DSC, curing, polyester resin, mould, kinetic model