Simultaneous differential scanning calorimetry and near-infra-red analysis of the curing of tetraglycidyldiaminodiphenylmethane with diaminodiphenylsulphone

de Bakker C.J., St John N.A. and George G.A. (1993) Simultaneous differential scanning calorimetry and near-infra-red analysis of the curing of tetraglycidyldiaminodiphenylmethane with diaminodiphenylsulphone. Polymer, 34 4: 716-725. doi:10.1016/0032-3861(93)90353-C


Author de Bakker C.J.
St John N.A.
George G.A.
Title Simultaneous differential scanning calorimetry and near-infra-red analysis of the curing of tetraglycidyldiaminodiphenylmethane with diaminodiphenylsulphone
Journal name Polymer   Check publisher's open access policy
ISSN 0032-3861
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0032-3861(93)90353-C
Volume 34
Issue 4
Start page 716
End page 725
Total pages 10
Subject 1605 Policy and Administration
2507 Polymers and Plastics
Abstract The crosslinking reaction of tetraglycidyl-4,4′-diaminodiphenylmethane with 27% 4,4′-diaminodiphenylsulphone at 150°C and 170°C was studied by near-i.r. spectroscopy while simultaneously recording the heat flow by isothermal differential scanning calorimetry (d.s.c.). From the absolute concentrations of primary, secondary and tertiary amine groups and the epoxy, hydroxyl and ether groups measured throughout the reaction, instantaneous rate curves were obtained and used along with reported reaction enthalpies to calculate heat flow curves for comparison with the d.s.c. data. It was found that previous assumptions of a constant reaction enthalpy were incorrect and values of -83 ± 2, -131 ± 9 and -65 ± 6 kJ mol-1 for epoxide reaction with primary amine, secondary amine and hydroxyl, respectively, gave the best fit between near-i.r. and d.s.c. data. Deviations between fitted and experimental data after gelation were attributed to heat capacity changes on vitrification and allowed a 'true' isothermal baseline to be constructed. From the corrected isothermal d.s.c. data and the absolute concentration of epoxide consumed, an average reaction enthalpy of -92 ± 1 kJ mol-1 was obtained. Reasons for discrepancies between these and scanning d.s.c. data are considered.
Keyword cure kinetics
differential scanning calorimetry
epoxy resin
near-infra-red spectroscopy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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