The Effect of Molecular Weight of Resin on Cure Kinetics of Epoxy/ Diaminodiphenylmethane

Document Type : Research Article

Authors

1 Polymer Engineering and Color Technology Faculty, Amirkabir University of Technology, P.O. Box 15875-654 Tehran, I.R. IRAN

2 Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, P.O. Box 16765-654 Tehran, I.R. IRAN

Abstract

Epoxy resins are among the most versatile thermosetting systems, because of their outstanding properties and wide range applications. In thermosetting systems, the kinetic characterization usually required to understand structure-property-processing relationships for the material manufacturing and utilization. The curing behavior and kinetics of liquid epoxy resin with diaminodiphenylmethane (DDM) as the curing agent was studied by many researchers. But there is no any report on the kinetics of solid epoxy systems. Therefore, in this work the curing kinetics of epoxy resins with various molecular weights (i.e. 380 and 1400 g mol-1) was elucidated by non-isothermal Differential Scanning Calorimetry (DSC). The experimental results have been investigated by model free kinetics. The results showed that the activation energy of liquid epoxy/DDM was in the range of 48±2 kJ/mol and might be considered to be constant during the curing. But the activation energy of the solid epoxy system increased steadily with the conversion, especially in the later stages (α > 0.6).  

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Main Subjects

References

[1] Ellis B., "Chemistry and Technology of Epoxy Resin", Chapman & Hall, (1993).
[2] Ivankovic M., Incarnato L., Kenny J.M., Nicolais L., Curing Kinetics and Chemorheology of Epoxy/Anhydride System, Journal of Applied Polymer Science, 90, p. 3012 (2003).
[3] Teil H., Page S.A., Michaud V., Manson J.A.E., TTT-Cure Diagram of an Anhydride-Cured Epoxy System Including Gelation, Vitrification, Curing kinetics Model, and Monitoring of the Glass Transition Temperature, Journal of Applied Polymer Science, 93, p. 1774 (2004).
[4] Ramakrishna H.V., Rai S.P.P., Flexural S.K., Compression, Chemical Resistance, and Morphology Studies on Granite Powder-Filled Epoxy and Acrylonitrile Butadiene Styrene-Toughened Epoxy Matrices, Journal of Applied Polymer Science, 104, p. 171 (2007).
[5] Yu H., Shi Q., Jiang S., Jiang G., Preparation of Epoxy resin/CaCO3 Nanocomposites and Performance of Resultant Powder Coatings, Journal of Applied Polymer Science, 101 p. 2656 (2006).
[6] Shi Q., Wang L., Yu H., Jiang S., Zhao Z., Dong X., A Novel Epoxy Resin/CaCO3 Nanocomposite and its Mechanism of Toughness Improvement, Macromolecular Materials and Engineering, 291, p. 53 (2006).
[7] Liu G., Zhou X., Wang J., Gao J., Qu X., Zhang L., Curing Kinetics of Diglycidyl Ether of Bisphenol a and Diaminodiphenylmethane Using a Mechanistic Model, Macromolecular Theory and Simulations, 15, p. 339 (2006).
[8] Mercado L.A., Galià G.R., M., Cádiz V., Curing Studies of Epoxy Resins with Phosphorus-Containing Amines, Journal of Polymer Science Part A: Polymer Chemistry, 44, p. 1676 (2006).
[9] Starink M.J., The Determination of Activation Energy from Linear Heating Rate Experiments: A Comparison of the Accuracy of Isoconversion Methods, Thermochimica Acta, 404, p. 163 (2003).
[10] Sbirrazzuoli N., Vyazovkin S., Mititelu A., Sladic C., Vincent L., A Study of Epoxy-Amine Cure Kinetics by Combining Isoconversional Analysis with Temperature Modulated DSC and Dynamic Rheometry, Macromolecular Chemistry and Physics, 204, p. 1815 (2003).
[11] Seo K.S., Kim D.S., Curing Behavior and Structure of an Epoxy/Clay Nanocomposite System, Polymer Engineering and Science, 46, p. 1318 (2006).
[12] Vyazovkin S., Some Confusion Concerning Integral Isoconversional Methods that May Result from the Paper by Budrugeac and Segal Some Methodological Problems Concerning Nonisothermal Kinetic Analysis of Heterogeneous Solid-Gas Reactions, International Journal of Chemical Kinetics, 34, p. 418 (2002).
[13] Vyazovkin S., Modification of the Integral Isoconversional Method to Account for Variation in the Activation Energy, Journal of Computational Chemistry, 22, p. 178 (2001).
[14] Vyazovkin S., Isoconversional Kinetic Analysis of Thermally Stimulated Processes in Polymers, Macromolecular Rapid Communications, 27, p. 1515 (2006).
[15] Vyazovkin S., Isoconversional Method to Explore the Mechanism and Kinetics of Multi-Step Epoxy Cures, Macromolecular Rapid Communications, 20, p. 387 (1999).
[16] Sbirrazzuoli N., Mititelu-Mija A., Vincent L., Alzina C., Isoconversional Kinetic Analysis of Stoichiometric and Off-Stoichiometric Epoxy-Amine Cures, Thermochimica Acta, 447, p. 167 (2006).
Nashrieh Shimi va Mohandesi Shimi Iran
Volume 30, Issue 4 - Serial Number 63
December 2011
Pages 105-111

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