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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Related Experiment Video

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Preparation, Characterization, and Mechanism for Biodegradable and Biocompatible Polyurethane Shape Memory

Yu-Chun Chien1, Wei-Tsung Chuang2, U-Ser Jeng2

  • 1Institute of Polymer Science and Engineering, National Taiwan University , No. 1, Section 4 Roosevelt Road, Taipei 10617, Taiwan, R.O.C.

ACS Applied Materials & Interfaces
|February 7, 2017
PubMed
Summary

Researchers developed a waterborne biodegradable polyurethane shape memory elastomer (SME) with excellent shape recovery in 37°C water. This advanced material shows promise for biomedical applications like biodegradable stents and scaffolds.

Keywords:
biocompatiblebiodegradableelastomerin situ SAXSshape memory polyurethane

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Shape memory elastomers (SMEs) are functional materials with thermally induced shape memory capabilities.
  • Biodegradable SMEs are highly sought after for biomedical applications.
  • Polyurethanes offer tunable properties for advanced material design.

Purpose of the Study:

  • To prepare and optimize waterborne biodegradable polyurethane SMEs for enhanced shape memory properties.
  • To elucidate the thermally induced shape memory mechanism.
  • To evaluate the material's potential for biomedical applications.

Main Methods:

  • Synthesis of waterborne biodegradable polyurethanes using poly(ε-caprolactone) (PCL) and poly(l-lactic acid) (PLLA) oligodiols.
  • Optimization of soft segment ratios for shape memory behavior.
  • Characterization using differential scanning calorimeter (DSC), X-ray diffraction (XRD), and in situ small-angle X-ray scattering (SAXS).

Main Results:

  • An optimized polyurethane formulation exhibited a unique diamond-shape 2D SAXS pattern upon stretching, indicating an oriented crystalline structure.
  • The material demonstrated superior shape fixing and shape recovery, achieving ~100% recovery in 37°C water.
  • The biodegradable polyurethane SME showed good endothelial cell viability and low platelet adhesion.

Conclusions:

  • The developed waterborne biodegradable polyurethane SME possesses a unique thermally induced shape memory mechanism.
  • The material's properties make it a promising candidate for biodegradable medical devices such as stents and scaffolds.
  • The waterborne synthesis route and optimized composition contribute to excellent shape memory performance and biocompatibility.