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- W2056222803 abstract "Epoxy networks on the basis of diglycidyl ether of bisphenol-A (DGEBA) cured with aliphatic diols of different chain length in the presence of magnesium perchlorate or with 4,4′-diaminodiphenylmethane (DDM) and imidazole, respectively, were investigated by FTIR spectroscopy. The influence of the accelerator on the epoxy/amine system was studied. The addition of a low amount of imidazole leads to a decrease of the epoxy abssorption band at 915 cm−1 and to the appearance of a shoulder at 1132 cm−1 assigned to branched ether structures due to the reaction of epoxy groups with secondary hydroxyl groups. At higher concentrations only minimum changes of these bands are observed, but absorptions of unreacted amine functionalities near 3300 cm−1 remain in the spectra. — In the spectra of the epoxy/diol networks the epoxy bands have disappeared. The formation of ether structures indicated by absorption bands near 1120 cm−1 and the behavior of the hydroxyl band are strongly dependent on diol chain length and concentration. Only a small amount of diol is incorporated into the network by covalent bonding. The remaining diol acts as platicizer." @default.
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- W2056222803 date "1992-03-01" @default.
- W2056222803 modified "2023-09-23" @default.
- W2056222803 title "<title>FTIR spectroscopy studies on epoxy networks</title>" @default.
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- W2056222803 doi "https://doi.org/10.1117/12.56449" @default.
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