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Viscoelastic behavior of anhydride‐cured epoxy system initiated by thermal latent catalyst
Author(s) -
Kwak GeunHo,
Park SooJin,
Lee JaeRock
Publication year - 2001
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.1480
Subject(s) - activation energy , differential scanning calorimetry , epoxy , arrhenius equation , dynamic mechanical analysis , materials science , arrhenius plot , viscoelasticity , isothermal process , rheology , polymer chemistry , dynamic modulus , rheometer , catalysis , composite material , thermodynamics , chemical engineering , chemistry , organic chemistry , polymer , physics , engineering
The thermal latency and viscoelastic behavior during the cure of a new catalytic ( N ‐benzylpyrazinium hexafluoroantimonate) anhydride‐cured epoxy system were studied with differential scanning calorimetry and a rheometer under isothermal conditions. The gelation time was obtained from the evaluation of the storage modulus, loss modulus, and damping factor. The temperature dependence on the reaction time was described by the Arrhenius expression, and the crosslinking activation energy was determined from the Arrhenius plot based on the gelation time and reaction temperature. The gelation time and crosslinking activation energy characterized from rheological behaviors increased with increasing anhydride composition and showed a maximum value with a mixing ratio of 0.65, which was due to the compact crosslinking network without a side reaction in the ratio. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 646–653, 2001