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Fluids 2016, 1(2), 15; doi:10.3390/fluids1020015

Modeling the Viscoelastic Behavior of Amorphous Shape Memory Polymers at an Elevated Temperature

1
Department of Mechanical & Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
2
Department of Mechancial & Industrial Engineering, Northeastern University, Boston, MA 02115, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Mehrdad Massoudi
Received: 1 March 2016 / Revised: 18 April 2016 / Accepted: 25 April 2016 / Published: 13 May 2016
(This article belongs to the Special Issue Rheology and the Thermo-Mechanics of Non-Newtonian Fluids)
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Abstract

Shape memory polymers (SMPs) are soft active materials, their special property is the ability to hold a temporary shape and when exposed to a suitable trigger, they come back to their original shape. These external stimuli can be temperature, light or electro-magnetic fields. Amorphous SMPs are a class of thermally-activated SMPs that rely on glass transition to retain their temporary shape. Above the glass transition temperature (T > Tg), (amorphous SMPs exhibit finite deformation and viscoelastic behavior. In this work we develop a model to capture the viscoelastic behavior of the amorphous SMPs at elevated temperatures. The model uses an approach that was initially developed to study non-Newtonian viscoelastic fluids. We accomplish this by developing a multi-branch model based on the theory of multiple natural configurations using the maximization of the rate dissipation to determine the evolution of the natural configurations. We apply our model to study several different deformations at an elevated temperature T = 130 °C and show that this approach is able to capture the viscoelastic behavior of these polymers. The predictions of the theory are then compared with experimental results. View Full-Text
Keywords: viscoelastic solids; shape memory polymer; multiple relaxation mechanisms viscoelastic solids; shape memory polymer; multiple relaxation mechanisms
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cui, F.; Moon, S.; Rao, I.J. Modeling the Viscoelastic Behavior of Amorphous Shape Memory Polymers at an Elevated Temperature. Fluids 2016, 1, 15.

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