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Quantitative analysis of epoxy resin cure reaction: A study by near-infrared spectroscopy

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Billaud, C Legras, Roger [UCL] Vandeuren, Mikhael [UCL] Carlier, Véronique [UCL]

Near-infrared spectroscopy was used to quantify the cure reaction of 4,4'-methylene-bis-(2,6-diethylaniline) (MDEA)-epoxy resins (E/A = 1.4) carried out at 72 and 160 degreesC. The absorption hands of the functional groups of interest in MDEA-epoxy resins are assigned according to the literature. A new assignment at 6580 cm(-1) is also proposed for the secondary amine: it was supported by a synthesized model compound. Two different spectrum treatments were proposed. The first one is based only on a normalization at 4610-4620 cm(-1), while the second one needs the subtraction of the normalized spectrum of a post-cure sample. To follow the curing process, amines and epoxy were studied at the same time in the combination and the overtone regions. The results are compared. In the combination region, quantitative results are obtained from absorbance measurements, while in the overtone region spectrum decompositions and area measurements are necessary. Complementary and reliable information are so obtained and allow us to calculate conversions of epoxide and amine I and concentrations in amine II, amine III, hydoxyl groups, and ether links. Kinetics are also established. The curing process mechanism is at last discussed for both curing temperatures.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2002
Language Anglais
Journal information "Applied Spectroscopy" - Vol. 56, no. 11, p. 1413-1421 (2002)
Peer reviewed yes
Publisher Soc Applied Spectroscopy (Frederick)
issn 0003-7028
e-issn 1943-3530
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Keywords near-infrared spectroscopy ; spectrum decomposition ; epoxy resin ; kinetics ; curing process
Links
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Bibliographic reference Billaud, C ; Legras, Roger ; Vandeuren, Mikhael ; Carlier, Véronique. Quantitative analysis of epoxy resin cure reaction: A study by near-infrared spectroscopy. In: Applied Spectroscopy, Vol. 56, no. 11, p. 1413-1421 (2002)
Permanent URL http://hdl.handle.net/2078.1/41515