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Proceedings Paper

Time dependent thermo-mechanical behavior of thermally induced shape memory polymers
Author(s): Francisco Castro; H. Jerry Qi; Jason M. Hermiller; Ernie Havens
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Paper Abstract

Shape memory polymers (SMPs) are polymers that can recover a large pre-deformed shape in response to environmental stimuli, such as temperatures, light, etc. For a thermally induced amorphous shape memory polymer, the pre-deformation and recovery of the shape require the material to traverse the glassy transition temperature Tg under constrained or free conditions. In this paper, effects of thermal rates to mechanical behaviors of SMP under constrained condition were investigated. The stress-temperature behavior demonstrates a faster stress decrease than thermal contraction during cooling and a characteristic stress overshoot during constrained reheating. These observations were explained by a one dimensional (1D) model that considers the non-equilibrium structure relaxation and viscoelastic behavior of the material.

Paper Details

Date Published: 1 April 2009
PDF: 9 pages
Proc. SPIE 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009, 72900K (1 April 2009); doi: 10.1117/12.817609
Show Author Affiliations
Francisco Castro, Univ. of Colorado at Boulder (United States)
H. Jerry Qi, Univ. of Colorado at Boulder (United States)
Jason M. Hermiller, Cornerstone Research Group, Inc. (United States)
Ernie Havens, Cornerstone Research Group, Inc. (United States)


Published in SPIE Proceedings Vol. 7290:
Industrial and Commercial Applications of Smart Structures Technologies 2009
Benjamin K. Henderson; M. Brett McMickell, Editor(s)

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