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Vitrification and Devitrification during the Non-Isothermal Cure of a Thermoset. Theoretical Model and Comparison with Calorimetric Experiments

✍ Scribed by Iria Fraga; Salvador Montserrat; John M. Hutchinson

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
516 KB
Volume
211
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The processes of vitrification and devitrification that occur during the non‐isothermal cure of a cross‐linking system are studied in terms of their dependence on frequency. Experimental results are obtained by TOPEM, a new multi‐frequency temperature modulated differential scanning calorimetry (TMDSC) technique, and a simulation with MATLAB was used to model the vitrification and devitrification times as a function of the frequency and heating rate. Simulations were made for five different velocities of scan. Other parameters, such as the exponents in the Kamal equation, λ in the DiBenedetto equation, and the activation energy for the frequency dependence of T~g~, were also considered. The experimental and simulated results were found to be in good agreement and some advantages of the TOPEM technique are discussed.

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📜 SIMILAR VOLUMES

Vitrification during the Isothermal Cure
Vitrification during the Isothermal Cure of Thermosets: Comparison of Theoretical Simulations with Temperature-Modulated DSC and Dielectric Analysis
✍ Iria Fraga; Salvador Montserrat; John M. Hutchinson 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 328 KB

## Abstract Vitrification during the isothermal cure of a thermoset, which is monitored by dynamic techniques such as temperature‐modulated differential scanning calorimetry (TMDSC) or dielectric analysis (DEA), is analyzed in terms of its dependence on frequency. A simulation was used to obtain th