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Effect of local dynamics on model epoxy resins
Author(s) -
Monnerie L.,
Halary J. L.,
Lauprêtre F.
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950980188
Subject(s) - epoxy , diamine , materials science , viscoelasticity , modulus , polymer chemistry , relaxation (psychology) , stiffness , glass transition , dynamic mechanical analysis , composite material , chemical engineering , polymer , psychology , social psychology , engineering
A series of epoxy resins has been prepared with different chain stiffness either in the diepoxide residue or in the diamine crosslinker (1). Furthermore, the crosslink density has been changed by incorporating either monoamine or secondary diamine as a chain extender, but in each system the stoichiometric ratio was maintained (1). Viscoelastic measurements were performed over a wide range of frequencies with the aim of determining the main characteristics associated with the Tg and β relaxation processes (2, 3). In a complementary way, high resolution solid state 13 C NMR measurements were carried out to determine the mobilities of the different aliphatic carbons in the epoxy moieties (4). The effects of the chemical structure and of the crosslink density on the mobility of the different groups and the consequences on the Tg values, the amplitude of the β transition and the modulus of the resins are analyzed (5).