Bioglass/high density polyethylene composite for soft tissue applications: preparation and evaluation

Area of Science:

• Biomaterials science
• Polymer composites
• Bioceramics

Background:

• High-density polyethylene (HDPE) is a versatile polymer with potential for medical applications.
• Bioglass is a bioactive glass known for its ability to form an apatite layer in vivo.
• Combining HDPE with Bioglass could yield composite materials with enhanced biocompatibility and mechanical properties.

Purpose of the Study:

• To investigate the incorporation of particulate 45S5 Bioglass into HDPE.
• To characterize the mechanical properties and bioactivity of Bioglass/HDPE composites.
• To evaluate the potential of these composites for medical applications.

Main Methods:

• 45S5 Bioglass particles (46 µm average size) were compounded with HDPE at 10%, 20%, and 40% by volume.
• Composites were processed using blending, compounding, powdering, and compression molding.
• Mechanical properties (Young's modulus, microhardness, tensile strength, fracture strain) were measured.
• Fourier transform infrared (FTIR) spectroscopy was used to assess apatite layer formation after exposure to simulated body fluid (SBF-9).

Main Results:

• Bioglass particles were homogeneously dispersed within the HDPE matrix.
• Young's modulus and microhardness increased with higher Bioglass content.
• Tensile strength and fracture strain decreased with increasing Bioglass volume.
• All composite compositions successfully developed a surface biological apatite layer in SBF-9, similar to bulk Bioglass.

Conclusions:

• Bioglass/HDPE composites can be successfully fabricated with good particle dispersion.
• The mechanical properties can be tuned by varying Bioglass content.
• The development of a biological apatite layer confirms the bioactivity of these composites, suggesting their suitability for medical applications.