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Dynamic mechanical response of model epoxy networks in the glassy state
Author(s) -
Cukierman Serge,
Halary JeanLouis,
Monnerie Lucien
Publication year - 1991
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.760312006
Subject(s) - materials science , epoxy , flexibility (engineering) , dynamic mechanical analysis , relaxation (psychology) , dynamic modulus , composite material , modulus , glass transition , amplitude , atmospheric temperature range , elastic modulus , thermodynamics , polymer , optics , psychology , social psychology , statistics , physics , mathematics
The dynamic mechanical properties of model epoxy‐amine networks are investigated in the glassy state over a wide range of frequencies, at temperatures between 123 K and 350 K. The effects of crosslink density and network chain flexibility on the β relaxation are examined. Motions responsible for the β process begin to develop at the same temperature, whatever the crosslink density. However, an increase in crosslink density is accompanied by an increase in amplitude and a broadening towards high temperatures of both damping tan δ and loss modulus E ″. This effect is responsible for the decrease of elastic modulus E ′ at room temperature with increasing crosslink density.