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Angular dependent ESCA and infrared studies of segmented polyurethanes.

G L Grobe, J A Gardella, W L Hopson

    Journal of Biomedical Materials Research
    |February 1, 1987
    PubMed
    Summary
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    Analyzing complex polymer surfaces for biomedical implants requires multiple techniques. Combining spectroscopy and X-ray photoelectron spectroscopy (XPS) reveals surface impurities and composition, crucial for material development.

    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Surface Science

    Background:

    • Biomedical implants rely on complex polymer mixtures with specific surface properties.
    • Understanding surface composition and bonding is critical for implant performance and biocompatibility.

    Purpose of the Study:

    • To investigate the surface bonding and composition of biomedical polymers using a combination of analytical techniques.
    • To characterize commercially available polymers (Biomer, Avcothane) and model systems (polydimethylsiloxane, Avcomat).

    Main Methods:

    • Utilized vibrational spectroscopy (Attenuated Total Reflectance - ATR, Photoacoustic - PA) for bulk and surface analysis.
    • Employed angular-dependent X-ray Photoelectron Spectroscopy (XPS or ESCA) for detailed surface composition.
    • Compared surface sensitivity and depth profiling capabilities of different spectroscopic methods.

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    Main Results:

    • Identified impurities segregated in the near-surface region, not detected by surface infrared.
    • Determined the depth of polydimethylsiloxane (DMS) block segregation in Avcothane.
    • Confirmed the presence of DMS within the top 20 Angstroms of Biomer surfaces.

    Conclusions:

    • A multi-technique approach is essential for comprehensive understanding of complex polymer surfaces.
    • Sample preparation and morphology control are critical factors in surface analysis.
    • The study provides insights into the surface characteristics of biomedical polymers relevant to implant applications.