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Tailoring the Shape Memory Properties of Segmented Poly(ester urethanes) via Blending.

Anuja Shirole1, Carlo U Perotto1, Sandor Balog1

  • 1Adolphe Merkle Institute , University of Fribourg , Chemin des Verdiers 4 , 1700 Fribourg , Switzerland.

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Summary

Researchers developed new shape-memory polyurethanes (PUs) by adding poly(1,4-butylene adipate) (PBA) or poly(ε-caprolactone) (PCL). These advanced PUs offer tunable shape memory properties, ideal for biomedical applications requiring precise temperature control.

Keywords:
blendsmelt-mixingnucleationpoly(ester urethane)shape fixationshape memory polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Thermoplastic segmented polyurethanes (PUs) exhibit shape memory effects through physical cross-links dissociating at different temperatures.
  • Crystallizable soft segments, like poly(1,4-butylene adipate) (PBA), alongside hydrogen-bonded hard phases, enable shape memory functionality with melting transitions acting as switches.

Purpose of the Study:

  • To tailor the fixation and recovery temperatures of shape-memory polyurethanes for biomedical applications.
  • To investigate the formulation of a commercial PU with PBA or poly(ε-caprolactone) (PCL) to control shape memory behavior.

Main Methods:

  • Formulation of a commercial PU with PBA or PCL of moderate molecular weight.
  • Analysis of the influence of end groups and processing conditions on component reactions (i.e., reaction vs. blend).
  • Characterization of crystallization and melting temperatures, shape fixity, strength, and modulus.

Main Results:

  • Addition of PBA or PCL induced nucleation, increasing crystallization temperature above ambient.
  • Achieved excellent shape fixity (∼98%) at 37 °C.
  • Maintained melting temperatures above 50 °C with significant increases in strength and modulus.

Conclusions:

  • The developed materials platform allows for precise control over shape memory properties.
  • The new PUs are well-suited for biomedical applications requiring shape fixation at physiological temperatures.
  • Formulation with PBA or PCL offers a versatile approach to advanced shape-memory materials.