UHMWPE/CaSiO₃ Nanocomposite: Mechanical and Tribological Properties

Area of Science:

• Materials Science
• Polymer Chemistry
• Tribology

Background:

• Ultra-high-molecular weight polyethylene (UHMWPE) is a versatile polymer with good mechanical properties.
• Enhancing the tribological performance of UHMWPE is crucial for demanding applications.
• Synthetic wollastonite (CaSiO3) nanoparticles offer potential as a reinforcing filler.

Purpose of the Study:

• To investigate the impact of synthetic wollastonite additives on the properties of UHMWPE.
• To characterize the structural, mechanical, and tribological behavior of the resulting polymer composite materials (PCM).
• To explore the tribochemical interactions during friction.

Main Methods:

• Autoclave synthesis of needle-shaped nanosized CaSiO3 particles.
• Incorporation of CaSiO3 into UHMWPE at varying concentrations (0.5-20 wt.%).
• Characterization using thermogravimetric analysis, X-ray fluorescence, scanning electron microscopy, laser light diffraction, and infrared spectroscopy.

Main Results:

• Synthetic wollastonite effectively reinforced UHMWPE, improving deformation-strength and tribological characteristics.
• Nanosized, needle-shaped CaSiO3 particles were successfully synthesized.
• Infrared spectroscopy revealed wollastonite's active role in tribochemical reactions, forming new oxygen-containing functional groups.
• The developed UHMWPE/CaSiO3 composites demonstrated high wear resistance.

Conclusions:

• Synthetic wollastonite is an effective filler for enhancing UHMWPE properties.
• The developed UHMWPE/CaSiO3 composites exhibit superior wear resistance.
• These materials are promising for use as triboengineering components.