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Modulated temperature differential scanning calorimetry

Characterization of curing systems by TTT and CHT diagrams

Journal of Thermal Analysis and Calorimetry
Authors: A. Van Hemelrijck and B. Van Mele

Abstract  

Modulated temperature differential scanning calorimetry (MTDSC) is used to study simultaneously the evolution of heat flow and heat capacity for the isothermal and non-isothermal cure of an epoxy-anhydride thermosetting system. Modelling of the (heat flow related) chemical kinetics and the (heat capacity related) mobility factor contributes to a quantitative construction of Temperature-Time-Transformation (TTT) and Continuous-Heating-Transformation (CHT) diagrams for the thermosetting system.

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Modulated temperature differential scanning calorimetry

Considerations for a quantitative study of thermosetting systems

Journal of Thermal Analysis and Calorimetry
Authors: G. Van Assche, A. Van Hemelrijck, and B. Van Mele

Abstract  

The influence of temperature modulation and signal treatment (deconvolution procedure) of modulated temperature differential scanning calorimetry is discussed with respect to the investigation of cure kinetics of thermosetting systems. The use of a ‘dynamic’ heat capacity calibration is not important for this purpose due to normalization of the heat capacity signal in all cure experiments. The heat flow phase during isothermal and non-isothermal cure is always small, giving rise to negligible corrections on the heat capacity and reversing heat flow signals in-phase with the modulated heating rate. The evolution of the heat flow phase contains information on relaxation phenomena in the course of the chemical reactions.

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