31 March 2009 Time dependent thermo-mechanical behavior of thermally induced shape memory polymers
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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.
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Francisco Castro, Francisco Castro, H. Jerry Qi, H. Jerry Qi, Jason M. Hermiller, Jason M. Hermiller, Ernie Havens, Ernie Havens, } "Time dependent thermo-mechanical behavior of thermally induced shape memory polymers", Proc. SPIE 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009, 72900K (31 March 2009); doi: 10.1117/12.817609; https://doi.org/10.1117/12.817609

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