Competitive primary amine/epoxy and secondary amine/epoxy reactions: Effect on the isothermal time‐to‐vitrify

Xiaorong Wang, John K. Gillham

doi:10.1002/app.1991.070431216

Competitive primary amine/epoxy and secondary amine/epoxy reactions: Effect on the isothermal time‐to‐vitrify

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書誌事項

公開日: 1991-12-20

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http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1002/app.1991.070431216

公開者: Wiley

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<jats:title>Abstract</jats:title><jats:p>The effect of temperature on the ratio of the kinetic rate constants, <jats:italic>k</jats:italic><jats:sub>2</jats:sub>/<jats:italic>k</jats:italic><jats:sub>1</jats:sub>, has been investigated using FTIR spectroscopy for the competing reactions of epoxy with secondary amine <jats:italic>(k</jats:italic><jats:sub>2</jats:sub>) and primary amine groups <jats:italic>(k</jats:italic><jats:sub>1</jats:sub>) in a trimethylene glycol di‐<jats:italic>p</jats:italic>‐aminobenzoate/diglycidyl ether of the bisphenol A system. The ratio of the rate constants increases from 0.16 to 0.33 in the temperature range 100−160°C. The corresponding difference in the activation energies for the competing reactions is about 3.7 kcal/mol. The effect of the ratio on the time‐to‐vitrify contour of the isothermal time–temperature–transformation (TTT) cure diagram is discussed: The effect is more significant at higher curing temperatures.</jats:p>