An infrared spectroscopic investigation of the curing reactions of the EPON 828/meta‐phenylenediamine system | Zendy

Schiering David W. | Zendy; Katon J. E. | Zendy; Drazal L. T. | Zendy; Gupta V. B. | Zendy

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An infrared spectroscopic investigation of the curing reactions of the EPON 828/meta‐phenylenediamine system

Author(s) -

Schiering David W.,

Katon J. E.,

Drazal L. T.,

Gupta V. B.

Publication year - 1987

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.1987.070340703

Subject(s) - curing (chemistry) , epoxy , amine gas treating , bisphenol a , stoichiometry , infrared spectroscopy , polymer chemistry , tertiary amine , materials science , chemistry , nuclear chemistry , composite material , organic chemistry

Mid‐ and near‐infrared (IR) spectroscopy has been used to study the curing of a bisphenol‐A based epoxy resin (EPON‐828) with a tetrafunctional curing agent, viz., meta‐phenylenediamine (MPDA). Three different cure cycles were used in the study. Primary amine functionality was observed to react relatively rapidly; none remained after curing for 2 h at 75°C. Secondary amine functionality was exhausted in epoxy rich samples subjected to the standard cure cycle (2 h at 75°C followed by 2 h at 125°C). In samples with stoichiometric amount or higher MPDA, complete reaction of secondary amine or epoxy groups was not observed. In amine‐rich samples subjected to post curing (6 h at 175°C), evidence was seen for the reaction of hydroxyl and epoxy groups, resulting in a considerable increase in the crosslink density of these samples.

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