Comparison of the curing kinetics of a DGEBA/acid anhydride epoxy resin system using differential scanning calorimetry and a microwave‐heated calorimeter

Abstract

The cure of an epoxy resin system, based upon a diglycidyl ether of bisphenol-A (DGEBA) with HY917 (an acid anhydride hardener) and DY073 (an amine-phenol complex that acted as an accelerator), was investigated using a conventional differential scanning calorimeter and a microwave-heated power-compensated calorimeter. Dynamic cure of the epoxy resin using four different heating rates and isothermal cure using four different temperatures were carried out and the degree of cure and reaction rates were compared. The cure kinetics were analyzed using several kinetics models. The results showed different activation energies for conventional and microwave curing and suggested different reaction mechanisms were responsible for curing using the two heating methods. Resins cured using conventional heating showed higher glass transition temperatures than did those cured using microwave heating. Kinetics analysisThe reactions taking place in an uncatalyzed acid anhydride-cured epoxy system include monoester, diester, and ether formation, as seen in Scheme 1. 12Correspondence to: R. J. Day (richard.day@manchester.ac.uk).

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“…The kinetic model for a dynamic curing process with a constant heating rate can be expressed in the following form 19,20 :…”

Kinetics and mechanistic investigation of epoxy-anhydride compositions cured with quaternary phosphonium salts as accelerators

“…The curing kinetics of epoxy compositions can be studied using various research methods . DSC is one of the most popular tools for studying curing kinetics of epoxy oligomers . The kinetics of curing reaction of epoxy anhydride compounds catalyzed by tertiary amines was examined in depth elsewhere using model‐fitting non‐isothermal DSC, which is simple and convenient method of calculation of the apparent activation energy values.…”

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