Effect of chain flexibility in the network structure on the viscoelasticity of epoxy thermosets

Journal article (2011)
Department
Precision and Microsystems Engineering (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2011 The Author(s). This article is published with open access at SpringerLink.com
DOI: https://doi.org/doi:10.1007/s10965-011-9595-5
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Published Date

16-03-2011

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Source:

Journal of Polymer Research, 18 (6), 2011

Faculty

Mechanical, Maritime and Materials Engineering

Department

Precision and Microsystems Engineering

Abstract

In this paper a detailed study in investigating the effect of the chain flexibility in epoxy-amine crosslinked network is done. In order to introduce flexibility into the crosslinked network a homologous series of four aliphatic diamine curing agents varying only in the chain length and having a constant functionality (f?=?4) is taken and cured stoichiometrically with aromatic epoxy (f?=?2) resin. For each of the cured mixture the viscoelastic master curve and corresponding shift factors were determined. It is found the introduction of flexibility shifts the viscoelastic curves by 5 decades with respect to frequency scale. This shift in the viscoelastic curve is modeled with a parameterized Havriliak-Negami model for the master curve. The free volume contribution for the changes in the coefficient of thermal expansion at T g is also determined.

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