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Erosion of composite polymer matrices

A Göpferich1

  • 1Department of Pharmaceutical Technology, University of Erlangen-Nürnberg, Germany.

Biomaterials
|March 1, 1997
PubMed
Summary

Composite polymer implants erode in a two-phase process, with a polylactide layer delaying core erosion for controlled drug release. This two-phase erosion mechanism is key for programmed drug delivery systems.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomedical Engineering

Background:

  • Composite polymer matrices are designed for preprogrammed drug release via implants.
  • Understanding erosion mechanisms is crucial for optimizing drug delivery profiles.

Purpose of the Study:

  • To investigate the erosion mechanism of layered composite polymer matrices.
  • To correlate erosion behavior with drug release kinetics.

Main Methods:

  • Fabrication of cylindrical polymer matrices with distinct layers (polyanhydride and polylactide).
  • Analysis of erosion using Wide Angle X-ray Diffraction (WAXD) and Differential Scanning Calorimetry (DSC).
  • Monitoring release of model compounds (brilliant blue, carboxyfluorescein).

Main Results:

  • Erosion occurs in a two-phase process, with sequential erosion of polyanhydride layers.
  • Sebacic acid accumulation and release were observed periodically.
  • Polylactide layer delayed core erosion by 10-14 days, confirmed by model compound release.
  • Theoretical models supported the proposed two-phase erosion mechanism.

Conclusions:

  • The composite matrix exhibits a predictable two-phase erosion behavior.
  • The polylactide layer acts as a protective barrier, enabling delayed erosion of the core.
  • This layered structure is effective for controlled, preprogrammed drug release from implants.

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