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Calorimetric and microwave dielectric monitoring of epoxy resin cure
Author(s) -
Carrozzino Simona,
Levita Giovanni,
Rolla Pierangelo,
Tombari Elpidio
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760300608
Subject(s) - materials science , calorimetry , epoxy , diglycidyl ether , dielectric , microwave , differential scanning calorimetry , composite material , analytical chemistry (journal) , bisphenol a , thermodynamics , chemistry , organic chemistry , optoelectronics , physics , quantum mechanics
The cure process of a BADGE (diglycidyl ether of bisphenol‐A) resin (Epon 828) and ethylenediamine has been investigated by means of calorimetry and dielectrometry in the microwave region (10 7 –10 10 Hz) in the temperature range 50 to 70°C. Kinetic data from calorimetry were analyzed in detail. An overall kinetic order of 2.5 has been obtained. The time domain reflectometry (TDR) has been used to characterize pure components and their mixtures. Cure monitoring was carried out with both TDR and a cavity method at fixed frequency (9.5 × 10 9 Hz). A very good agreement was obtained between the reaction rate as measured by calorimetry and the rate of decrease of dielectric constants up to very high conversion. This was explained by admitting that the rates of disappearance of dielectric dipoles and of reactive species coincided.