Polyurethane smart fiber with shape memory function: Experimental characterization and constitutive modelling |
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Authors: | Seok Jin Hong Woong-Ryeol Yu Ji Ho Youk Yang Rae Cho |
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Institution: | 1.Department of Materials Science and Engineering,Seoul National University,Seoul,Korea;2.Department of Advanced Fiber Engineering, Division of Nano-Systems,Inha University,Incheon,Korea;3.Chemex Ulsan R&D Center,Hosung Chemex Co.,Ulsan,Korea |
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Abstract: | Segmented polyurethane (PU) polymers are known to have shape memory function, i.e., when they reach certain temperatures,
they deform into the memorized shape from any temporary one. In the present study, PU polymers were spun into fibers using
the conventional extrusion process to investigate the feasibility of producing smart fibers with shape memory function. The
shape memory polymers (SMPs) and their spun fibers were characterized using DSC, DMTA, and tensile test. In particular, the
thermo-mechanical deformation behavior, which enables to evaluate the shape memory performance of the SMPs, was characterized
using DMTA. Then, the linear viscoelastic theory was utilized for mathematical modelling of the thermo-mechanical behavior
of the SMPs. For the shape memory fibers, the large deformation characteristics were also investigated using the thermo-mechanical
test, necessitating the development of nonlinear viscoelastic theory to formulate a constitutive equation and to provide an
effective tool for designing smart textile structure. |
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