Poly(L-lactic acid) Reinforced with Hydroxyapatite and Tungsten Disulfide Nanotubes

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Poly(L-lactic acid) (PLLA) is a biocompatible polymer with diverse applications.
• Hydroxyapatite (HA) is a key component of bone, making PLLA-HA composites promising for bone regeneration.
• PLLA-HA nanocomposites traditionally exhibit poor mechanical strength, limiting their use in load-bearing applications.

Purpose of the Study:

• To investigate the effect of incorporating non-toxic WS2 nanotubes (INT-WS2) into PLLA-HA films.
• To enhance the mechanical and thermal properties of PLLA-HA nanocomposites for improved biomedical applications.

Main Methods:

• Fabrication of PLLA-HA films with varying amounts of INT-WS2.
• Structural analysis using electron microscopy, X-ray diffraction, Raman microscopy, and infrared spectroscopy.
• Mechanical testing including tensile measurements, micro-hardness, and nanoindentation.
• Thermal property evaluation using differential scanning calorimetry.

Main Results:

• The addition of INT-WS2 significantly improved the mechanical properties of the PLLA-HA films.
• Enhanced tensile strength, micro-hardness, and nanoindentation resistance were observed in the composite films.
• Improved thermal stability was also detected in the PLLA-HA-INT-WS2 nanocomposites.

Conclusions:

• Incorporating WS2 nanotubes is an effective strategy to overcome the mechanical limitations of PLLA-HA biomaterials.
• The enhanced PLLA-HA-INT-WS2 nanocomposite demonstrates superior mechanical and thermal performance.
• These improved properties make the developed nanocomposite highly advantageous for bone repair and medical implant applications.