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Related Experiment Videos

Subcutaneous implants of polypropylene filaments

T C Liebert, R P Chartoff, S L Cosgrove

    Journal of Biomedical Materials Research
    |November 1, 1976
    PubMed
    Summary

    Polypropylene (PP) implants degrade via oxidation within days, but antioxidants significantly slow this process. This research reveals insights into synthetic polymer degradation in vivo.

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    Area of Science:

    • Biomaterials Science
    • Polymer Chemistry
    • Materials Degradation

    Background:

    • Polypropylene (PP) is widely used in medical implants.
    • Understanding in vivo degradation is crucial for material longevity and safety.
    • The degradation mechanisms of PP implants require further elucidation.

    Purpose of the Study:

    • To investigate the degradation rate and mechanism of polypropylene filaments implanted subcutaneously in hamsters.
    • To evaluate the efficacy of antioxidants in preventing PP degradation in vivo.
    • To establish correlations between chemical changes and mechanical properties during degradation.

    Main Methods:

    • Subcutaneous implantation of PP filaments (with and without antioxidant) in hamsters for 5 months.
    • Periodic analysis using infrared spectroscopy to detect chemical changes (hydroxyl and carbonyl content).
    • Dynamic mechanical testing to assess changes in the dynamic loss tangent (tan delta).

    Main Results:

    • Polypropylene degradation initiated within days, showing increased hydroxyl content (0.061 mg/g/day).
    • Carbonyl bonds appeared after 50-90 days, indicating oxidative processes.
    • Unmodified PP showed decreased mechanical integrity (tan delta), while antioxidant-containing PP remained stable.
    • An induction time of 108 days was observed before significant degradation.

    Conclusions:

    • Subcutaneous implantation triggers an oxidative degradation process in polypropylene.
    • Antioxidants effectively retard the in vivo degradation of PP implants.
    • Findings suggest potential strategies for enhancing the in vivo stability of synthetic polymers.

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