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Relationship between viscoelastic properties and gelation in thermosetting systems
Author(s) -
Tung ChiangYing M.,
Dynes Paul J.
Publication year - 1982
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.1982.070270220
Subject(s) - thermosetting polymer , viscoelasticity , curing (chemistry) , materials science , isothermal process , dynamic mechanical analysis , glass transition , composite material , polymer chemistry , dynamic modulus , polymer , thermodynamics , physics
A method is described for determining from dynamic viscoelastic data the gel time of thermosetting resins. Gelation of nine systems including epoxies, acetylene‐terminated sulfone, and silicones was correlated with the crossover of the dynamic storage G ′ and loss G ″ moduli measured during isothermal curing. The effect of measurement frequency on gel time is discussed and related to the standard gel test. A lower temperature limit for the valid aplication of this technique was found to be at T > T gg + 30°C, where T gg is the glass transition of the system at the gel point.