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Related Experiment Video

Updated: Feb 19, 2026

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Post-Crosslinked Polyurethanes with Excellent Shape Memory Property.

Wenkai Liu1, Yun Zhao1, Rong Wang1

  • 1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.

Macromolecular Rapid Communications
|October 31, 2017
PubMed
Summary
This summary is machine-generated.

New biodegradable shape-memory polyurethanes (CPUs) offer excellent mechanical properties and shape recovery for implantable medical devices. These advanced materials exhibit a transition temperature near body temperature, enhancing their suitability for minimally invasive surgery.

Keywords:
biodegradationbiomaterialspolyurethanespost-crosslinkingshape memory properties

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Materials Engineering

Background:

  • Shape-memory polymers are crucial for minimally invasive surgery implants.
  • Existing shape-memory polymers often lack optimal transition temperatures, mechanical strength, and biodegradability.
  • There is a need for advanced biomaterials that meet these critical performance criteria.

Purpose of the Study:

  • To synthesize novel shape-memory polyurethanes (CPUs) with improved properties for implant applications.
  • To investigate the structure-property relationships and shape-memory mechanisms of the synthesized CPUs.
  • To evaluate the suitability of these CPUs as potential implant biomaterials.

Main Methods:

  • Synthesis of shape-memory polyurethanes via postcrosslinking of linear polyurethanes with a flexible, biodegradable crosslinker.
  • Characterization of crosslinked polyurethanes (CPUs) using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA).
  • Evaluation of mechanical properties, shape-memory behavior, and transition temperature.

Main Results:

  • The synthesized CPUs exhibit good mechanical properties and excellent, repeatable shape-memory performance.
  • Postcrosslinking introduces elasticity into the hard segments, enhancing hydrogen bonding during deformation.
  • The inclusion of poly(ε-caprolactone) results in a shape-memory transition temperature around 37 °C, ideal for in vivo applications.

Conclusions:

  • The developed crosslinked polyurethanes (CPUs) demonstrate significant potential as implant biomaterials due to their tunable properties and biocompatibility.
  • The elastic crosslinking structure and body-temperature transition make them suitable for advanced medical devices.
  • The facile post-crosslinking polymerization process is amenable to industrial-scale production.