3 April 2013 Aging effects of epoxy shape memory polymers
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In this paper, experimental results are reported to study the influence of high-temperature aging on the thermo-mechanical behavior of a commercially-available, thermo-responsive shape memory polymer (SMP), Veri ex-E (glass transition temperature, Tg = 90−105 °C). To achieve a shape memory effect in high Tg SMPs such as this, high temperature cycles are required that can result in macromolecular scission and/or crosslinking, which we term thermo-mechanical aging (or chemo-rheological degradation). This process results in mechanical property changes and possible permanent set of the material that can limit the useful life of SMPs in practice. We compare experimental results of shape memory recovery with and without aging. Similar to the approach originated by Tobolsky in the 1950's, a combination of uniaxial constant stress and intermittent stretch experiments are also used in high temperature creep-recovery experiments to deduce the kinetics of scission of the original macromolecular network and the generation of newly formed networks having different reference configurations. The macroscopic effects of thermo-mechanical aging, in terms of the evolution of residual strains and change in elastic response, are quantified.
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Kannan Dasharathi, Kannan Dasharathi, John A. Shaw, John A. Shaw, } "Aging effects of epoxy shape memory polymers", Proc. SPIE 8689, Behavior and Mechanics of Multifunctional Materials and Composites 2013, 86890J (3 April 2013); doi: 10.1117/12.2009886; https://doi.org/10.1117/12.2009886

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