Dynamic thermomechanometry of networks from acrylated epoxy resins
1982; Elsevier BV; Volume: 23; Issue: 5 Linguagem: Inglês
10.1016/0032-3861(82)90065-9
ISSN1873-2291
Autores Tópico(s)Polymer composites and self-healing
ResumoDynamic thermomechanical analysis of networks from acrylated DGEBA type epoxy resins, crosslinked through u.v. induced polymerization, was performed to elucidate the effect of the functionality and functionality distribution of the oligomers on the network properties. Partially acrylated and propionated DGEBA resins were employed in which the acrylic functionality was changed in the range 2-1 double bonds per mole of the resin. The dynamic storage modulus, measured with a Rheovibron instrument, was found, in the high temperature region (>150°C), to follow the classical laws of rubber elasticity when the proper number of elastic effective chains was taken into account. The glass-rubber transition temperature was found to decrease linearly as a function of the fraction of free chain ends. The influence of the presence of CBr4 as a chain transfer agent on the network properties was also preliminarily investigated.
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