Bionanohybrid based on bioplastic and surface-functionalized carbon nanotubes

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Biodegradable polymers like poly(butylene succinate) (PBS) offer sustainable alternatives but often have limited mechanical properties.
• Carbon nanotubes (CNTs) are known for their exceptional mechanical strength and electrical properties.
• Surface modification of CNTs is crucial for effective integration into polymer matrices.

Purpose of the Study:

• To develop a bionanohybrid material by combining poly(butylene succinate) (PBS) with surface-oxidized carbon nanotubes (o-CNTs).
• To investigate the impact of incorporating o-CNTs on the mechanical and dynamic mechanical properties of PBS.
• To elucidate the mechanism behind the property enhancements using advanced characterization techniques.

Main Methods:

• Melt-mixing of poly(butylene succinate) (PBS) with surface-oxidized carbon nanotubes (o-CNTs).
• Mechanical testing including tensile strength, elongation at break, and toughness measurements.
• Dynamic mechanical analysis (DMA) to assess viscoelastic properties.
• Electron microscopy (e.g., SEM, TEM) and Raman spectroscopy for structural and mechanical analysis.

Main Results:

• The bionanohybrid exhibited a significant increase in elongation at break (approx. 55.1% vs. 21.2% for pure PBS).
• Toughness increased by approximately 150%, with moderate improvements in tensile modulus and strength.
• Dynamic mechanical properties of PBS were substantially enhanced by the addition of o-CNTs.
• Surface functionalization of o-CNTs facilitated improved dispersion and interfacial adhesion within the PBS matrix.

Conclusions:

• The melt-mixing of PBS with o-CNTs is an effective method for creating a high-performance bionanohybrid.
• The incorporation of o-CNTs significantly enhances the mechanical robustness and toughness of biodegradable PBS.
• The study provides insights into the structure-property relationships governing the performance of these advanced nanocomposites.