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Related Experiment Videos

Sulfonated poly(ethylene oxide)-grafted polyurethane copolymer for biomedical applications

D K Han1, K D Park, Y H Kim

  • 1Biomaterials Research Center, Korea Institute of Science and Technology, Cheongryang, Seoul.

Journal of Biomaterials Science. Polymer Edition
|March 11, 1998
PubMed
Summary

A novel sulfonated poly(ethylene oxide)-grafted polyurethane copolymer (PU-PEO-SO3) demonstrates enhanced hydrophilicity and superior biocompatibility. This advanced material shows reduced platelet and bacterial adhesion, making it ideal for biomedical applications like artificial organs.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Polyurethanes (PU) are widely used in biomedical applications but can elicit adverse biological responses.
  • Improving the biocompatibility of PU while maintaining its mechanical integrity is crucial for advanced medical devices.
  • Surface modification strategies are key to enhancing the performance of PU-based biomaterials.

Purpose of the Study:

  • To synthesize and characterize a novel sulfonated poly(ethylene oxide)-grafted polyurethane copolymer (PU-PEO-SO3).
  • To evaluate the bulk properties and biocompatibility of PU-PEO-SO3 in comparison to unmodified PU and non-sulfonated PU-PEO.
  • To assess the potential of PU-PEO-SO3 as a biomaterial for medical applications.

Main Methods:

  • Synthesis of PU-PEO-SO3 copolymer via grafting.

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  • Characterization of bulk properties including water uptake, glass transition temperature (Tg), and mechanical properties using DSC and mechanical testing.
  • Biocompatibility assessment through platelet adhesion tests, bacterial adhesion tests (S. epidermidis), and measurement of platelet factor 4 (PF4) release.

    • Main Results:

    • PU-PEO-SO3 exhibited significantly higher water uptake, indicating increased hydrophilicity compared to PU and PU-PEO.
    • DSC analysis revealed a lower Tg and suppressed melting endotherm in PU-PEO-SO3, suggesting increased microphase separation.
    • Mechanical properties of PU-PEO-SO3 were comparable to PU, demonstrating successful modification without compromising bulk integrity.
    • PU-PEO-SO3 showed substantially lower adhesion of platelets and S. epidermidis, along with the lowest PF4 release, indicating superior biocompatibility.

    Conclusions:

    • The developed PU-PEO-SO3 copolymer possesses enhanced hydrophilicity and excellent biocompatibility.
    • The material maintains desirable mechanical properties, making it suitable for biomedical uses.
    • PU-PEO-SO3 is a promising candidate for coating, molding, and blending in the fabrication of artificial organs and medical devices.