A Rheological Study of Biodegradable Injectable PEGMC/HA Composite Scaffolds

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Injectable biodegradable hydrogels offer minimally invasive delivery for applications like drug delivery and tissue engineering.
• Citric acid-based poly (ethylene glycol) maleate citrate (PEGMC)/hydroxyapatite (HA) composites are promising for bone tissue engineering.
• Understanding the mechanical properties of these hydrogels is crucial for their effective application.

Purpose of the Study:

• To investigate the mechanical properties of an in situ crosslinkable PEGMC/HA composite.
• To determine the effect of monomer ratio, crosslinker, initiator, and HA concentrations on gel crosslinking and mechanical properties.
• To explore the physical interactions between hydroxyapatite and citric acid-based PEGMC.

Main Methods:

• Dynamic linear rheology experiments were employed to study the mechanical properties.
• PEGMC/HA composites were synthesized with varying concentrations of key components.
• Rheological data was analyzed to understand crosslinking extent and viscoelastic properties.

Main Results:

• Varying monomer ratio, crosslinker, initiator, and HA concentrations significantly impacted the crosslinking extent and mechanical properties of the PEGMC/HA gels.
• Rheological studies provided novel insights into the physical interactions between HA and citric acid-based PEGMC.
• The study established a correlation between component concentrations and the resulting gel's mechanical performance.

Conclusions:

• The mechanical properties of injectable PEGMC/HA hydrogels can be tuned by adjusting component concentrations.
• Understanding these viscoelastic properties is essential for developing effective injectable scaffolds for bone tissue engineering.
• These findings support the broader application of citric acid-based biodegradable polymers in biomedical fields.