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International Journal of Polymer Science
Volume 2016, Article ID 7514974, 11 pages
http://dx.doi.org/10.1155/2016/7514974
Research Article

Modeling Based Characterization of Thermorheological Properties of Polyurethane ESTANE

1Institute of Mechanics (CE), University of Stuttgart, Pfaffenwaldring 7, 70569 Stuttgart, Germany
2Institute of Mechanics, Faculty of Civil and Environmental Engineering, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany

Received 19 March 2016; Revised 7 June 2016; Accepted 22 June 2016

Academic Editor: Kai Chen

Copyright © 2016 Ehsan Ghobadi et al. 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.

Abstract

Shape-Memory Polymers (SMPs) have the ability to be deformed and memorize this deformation until an external activation stimulus (e.g., heat) is applied. Therefore, they have attracted great interest in many areas, especially for applications where reconfigurable structures are required (e.g., Shape-Memory (SM) stents or micro air vehicles). Nevertheless, prior to technical application, the effective thermomechanical behavior of SMPs must be thoroughly understood. In the current contribution, an assessment of thermorheological properties of the commercially available polyurethane system ESTANE is presented. Thermorheological properties were investigated using Dynamic Mechanical Thermal Analysis (DMTA) and complementary uniaxial stress relaxation experiments. Upon material parameter optimization, a finite viscoelastic and incompressible material model was used to model experimentally observed viscoelastic properties.