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Real-time monitoring of the cure reaction of a TGDDM/DDS epoxy resin using fiber optic FT-IR

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George, G.A., Cole-Clarke, P., St. John, N. and Friend, G. (1991) Real-time monitoring of the cure reaction of a TGDDM/DDS epoxy resin using fiber optic FT-IR. Journal of Applied Polymer Science, 42 (3). pp. 643-657. ISSN 1097-4628

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Article Link: https://doi.org/10.1002/app.1991.070420310


The feasibility of using remote FT-IR spectroscopy to monitor the gelation reaction of an epoxy resin used in advanced composite materials has been studied. The commercial epoxy resins MY720 and MY721, consisting mostly of tetraglycidyl 4,4′-diaminodiphenyl methane (TGDDM) were cured with diaminodiphenylsulfone (DDS) in a microcapillary cell connected to an FT-IR spectrometer by single silica fiber optics. By operating in the near-IR, direct measurement of the consumption of epoxide and primary amine and growth in hydroxyl groups was possible. It was found that the primary amine band at 5067 cm−1 was the most sensitive for rapid and accurate real-time monitoring of the cure reaction up to gelation. The temperature dependence of amine consumption from 135 to 180°C gave an activation energy of 70 kJ mol−1 for the cure reaction in agreement with DSC. Several artefacts involved in using fiber optic FT-IR in this way have been identified.

Item Type:Article
Subjects:Science > Science (General)
Technology > Technology (General) > Spectroscopy
Live Archive:15 Feb 2024 03:09
Last Modified:15 Feb 2024 03:09

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