Metallurgical Engineering

Metallurgical Engineering

Reducing the damping factor in shape-memory scaffolds by increasing pneumatic pressure during the bio-extrusion process

Document Type : Research Paper

Authors
Kamyab Pourbagheri Jirandehi 1
Abdolhossein Jalali Aghchai 2
Shahram Etemadi Haghighi 3
Seyed Hashem Sezavar Seyedi Jandaghi 4
1 Research assistant,, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.
2 Associate Professor, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.
3 Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
4 Professor, Research Center for Prevention of Cardiovascular Disease, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran
10.22076/me.2025.2042028.1417
Abstract
Cardiac stent are intracorporeal structures used to open blocked coronary arteries caused by fatty plaques or metabolic abnormalities, and they can be utilized in either temporary or permanent forms. In this study, the effect of pressure parameter in the additive bio-manufacturing process (FDM) on the loss coefficient (Tan δ) of smart polymeric stents was investigated. The objective of this research is to enhance the shape memory effect of polymeric stents without the use of plasticizers or lubricants, and without the addition of polymeric nanocomposites. The results obtained from experimental DMTA and SEM analysis indicate that pressure variation during manufacturing leads to an 18.8% reduction in the loss coefficient and enhances the shape memory effect in the range approaching the shape memory region. Additionally, the results confirm the increase in atomic Van der Waals forces and the reduction of covalent and molecular bond lengths within the structure of the memory stent. These molecular composition changes provide the memory stent with greater elasticity and an improved capacity for energy storage within the smart active range.
Keywords
Loss coefficient
Tan &‌delta
Shape memory polymer (SMP)
Additive manufacturing process
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Metallurgical Engineering
Volume 28, Issue 2
Summer 2025
Pages 108-115

  • Receive Date 26 September 2024
  • Revise Date 09 February 2025
  • Accept Date 18 February 2025