Premium
Rheological study of the isothermal reticulation of an epoxy resin
Author(s) -
Harran Daniel,
Laudouard Annie
Publication year - 1986
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.1986.070320732
Subject(s) - shearing (physics) , vitrification , materials science , epoxy , isothermal process , rheology , composite material , reaction rate constant , modulus , growth rate , hardening (computing) , kinetics , thermodynamics , polymer chemistry , medicine , physics , geometry , mathematics , layer (electronics) , andrology , quantum mechanics
Abstract The complex modulus of shearing G * = G' + jG ″ was measured during the isothermal hardening of several epoxy resins. The gelation induces a slowing down of the rate of growth of viscous modulus ν ″ = d (log G ″)/ dt between two zones where this rate is constant. This slowing down of growth rate varies with the temperature and is null for T = T C gel : ν ″ 2 − ν ″ 1 = K (1/ T C gel −1/ T ). We have shown that the two phenomena of gelation and vitrification stay perfectly distinct at all temperatures and in particular at T C gel . So the decrease of the rate ν ″ associated with gelation disappears at this temperature without the vitrification being responsible.