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Branched Amphiphilic Polylactides as a Polymer Matrix Component for Biodegradable Implants.

Vladislav Istratov1,2, Vitaliy Gomzyak3, Valerii Vasnev1

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Researchers developed new lactic acid-based polymers to improve medical implants. These modified polyesters enhance hydrophilicity and reduce brittleness, making them more suitable for biomedical applications.

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amphiphilic block copolymershydrophilicityhydroxyapatitemechanical propertiespolylactidethermal properties

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry

Background:

  • Lactic acid-based polyesters, like polylactide (PLLA), are attractive for implants due to biocompatibility, biodegradability, and strength.
  • However, the inherent hydrophobicity of polylactide limits its biomedical applications.
  • Modifying polylactide to enhance hydrophilicity is crucial for broader use in medical devices.

Purpose of the Study:

  • To synthesize amphiphilic branched pegylated copolylactides to improve polylactide's properties.
  • To investigate the effect of these modified copolylactides on the characteristics of polylactide films.
  • To evaluate the impact of hydroxyapatite addition on the modified polylactide films.

Main Methods:

  • Ring-opening polymerization of L-lactide using tin (II) 2-ethylhexanoate catalyst.
  • Incorporation of hydrophilic groups via 2,2-bis(hydroxymethyl)propionic acid and its polyethylene glycol monomethyl ester derivative.
  • Characterization using 1H NMR spectroscopy and gel permeation chromatography.
  • Preparation of interpolymer mixtures with PLLA and hydroxyapatite filling.

Main Results:

  • Synthesized amphiphilic branched pegylated copolylactides with narrow molecular weight distribution (MWD) and controlled molecular weights (5000-13,000 Da).
  • Addition of 10 wt% copolylactides to PLLA films reduced brittleness, increased hydrophilicity (contact angle 71.9-88.5°), and enhanced water absorption.
  • 20 wt% hydroxyapatite filling further decreased contact angle to 66.1°, with a slight reduction in strength and elongation but increased thermal stability.

Conclusions:

  • Amphiphilic branched pegylated copolylactides effectively enhance the hydrophilicity and mechanical properties of PLLA.
  • Hydroxyapatite incorporation improves hydrophilicity and thermal stability without significantly altering thermal transitions.
  • These modified polyesters show promise for advanced biomedical implant applications.