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Effect of fused deposition modeling bioprinting variables on damping factor in shape memory structures for in vitro applications

Kamyab Pourbagheri Jirandehi,A. Jalali Aghchai,S. Etemadi Haghighi,Seyed Hashem Sezavar Seyedi Jandaghi

Published 2024 in Australian Journal of Mechanical Engineering

ABSTRACT

ABSTRACT The aim of this study is to investigate the variation in the shape memory effect in the Tan Delta output parameter of shape memory polymeric stents, fabricated by the bio-FDM process, during a reversible endothermic cycle with changes in the input parameters. Pure polycaprolactone polymer was directly used in this study. The Damping Factor, or Tan Delta, is a key factor in expressing the shape memory effect of the memory stents. For a more accurate evaluation of this effect, SEM tests, uniaxial tensile tests, and dynamic mechanical and thermal analyses were employed. The Tan Delta of the shape memory stents was approximately 18.81%. Surface morphology changes led to approximately a 14.18% variation in elastic properties, as the dynamic molecular motion and polymer chain constraints resulted in increased pressure. It was found that the fabrication input parameters led to approximately a 20% change in the shape memory effect.

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