Improvement of β-TCP/PLLA biodegradable material by surface modification with stearic acid

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Materials Engineering

Background:

• Poly-L-lactide (PLLA) is a widely used biodegradable polymer.
• Incorporating beta tricalcium phosphate (β-TCP) enhances PLLA's osteoinductive properties.
• Poor interfacial compatibility between β-TCP and PLLA hinders composite performance.

Purpose of the Study:

• To improve β-TCP/PLLA biomaterials through surface modification of β-TCP with stearic acid.
• To investigate the effects of stearic acid surface modification on β-TCP.
• To evaluate the impact of modification on the mechanical properties and interfacial behavior of β-TCP/PLLA composites.

Main Methods:

• Surface modification of β-TCP using stearic acid.
• Characterization of modified β-TCP using FTIR, XPS, TGA, and CA.
• Fabrication and mechanical testing (bending, tensile) of β-TCP/PLLA composites.
• Microstructural analysis of composite fractures using SEM.

Main Results:

• Stearic acid reacted with β-TCP, forming oxhydryl groups on the surface.
• Surface modification significantly improved the bending and tensile strengths of β-TCP/PLLA composites.
• SEM analysis revealed decreased interfacial debonding between β-TCP and PLLA after modification.

Conclusions:

• Stearic acid surface modification is an effective strategy to enhance the interfacial compatibility and mechanical properties of β-TCP/PLLA biomaterials.
• Improved interfacial adhesion leads to better load transfer and reduced failure at the filler-matrix interface.
• The modified composites show potential for improved performance in biomedical applications.