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Characterization of diol modified epoxy resins by near‐ and mid‐infrared spectroscopy
Author(s) -
Scherzer T.
Publication year - 1994
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.1994.070510312
Subject(s) - diol , epoxy , epoxide , diglycidyl ether , glass transition , infrared spectroscopy , ether , polymer chemistry , materials science , absorption (acoustics) , spectroscopy , chemistry , bisphenol a , organic chemistry , composite material , polymer , catalysis , physics , quantum mechanics
Near‐ and mid‐infrared spectroscopy has been used for the characterization of epoxy networks based on diglycidyl ether of bisphenol‐A cured with linear aliphatic diols of different chain length in the presence of magnesium perchlorate. Absorption bands due to epoxide, hydroxyl, and ether groups were investigated. The intensity of the hydroxyl absorption and the formation of branched and unbranched ether structures in dependence on the molar ratio and the diol chain length are discussed. A mechanism for the network formation process with respect to diol chain length and concentration is proposed: networks with low density are rapidly formed if long diols are used for modification, whereas the incorporation of short diols into the network takes a longer time but yields networks with a higher density. Glass‐transition temperatures of the networks obtained by dynamic thermomechanical analysis confirm the proposed mechanism. © 1994 John Wiley & Sons, Inc.