Analysis of mechanical and shape memory properties of biocompatible shape memory polymers with different Fe3O4 contents

Abstract

Shape memory polymers (SMPs) can recall their original shape when exposed to environmental factors like heat, light, or magnetic fields. These SMPs are extensively used in medical applications, notably in stents, due to their shape memory and biocompatibility after implantation in the human body. However, conventional stents require balloons for expansion, limiting their flexibility. To address this, the study developed an SMP material that can regain its original shape without the need for a balloon. To effectively induce self-response, magnetically responsive Fe3O4 nanoparticles at concentrations of 10%, 15%, and 20% were integrated, and their dispersion was verified using scanning electron microscopy. The study also utilized differential scanning calorimetry to measure the glass transition temperature, crystallization temperature, and melting point of the synthesized polymers. The confirmation of uniformly dispersed nanoparticles revealed that the synthesized polymers exhibited a high shape memory ratio (84%–93%). Shape memory ratio represents the ability to return from a temporarily deformed state to the initial, original shape. Therefore, the biocompatible, magnetic-responsive SMP developed in this study has the potential to be utilized in various medical devices as an advanced shape-memory material.