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Vitrification and Devitrification during the Non‐Isothermal Cure of a Thermoset. Theoretical Model and Comparison with Calorimetric Experiments
Author(s) -
Fraga Iria,
Montserrat Salvador,
Hutchinson John M.
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900322
Subject(s) - devitrification , vitrification , differential scanning calorimetry , isothermal process , thermosetting polymer , materials science , thermodynamics , activation energy , polymer chemistry , composite material , chemistry , crystallization , physics , nuclear physics
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.