Upcycling Waste Low-Density Polyethylene into Highly Crystalline Graphite

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Limited recycling rates and quality degradation of global plastic waste, particularly low-density polyethylene (LDPE).
• Conventional polymer precursors for carbon materials often have lower yields compared to novel approaches.

Purpose of the Study:

• To develop a novel method for converting waste LDPE into high-value, electrically conductive artificial graphite.
• To investigate the properties and potential applications of the synthesized LDPE-derived graphite (LGP).

Main Methods:

• Stabilization and graphitization processes applied to waste LDPE.
• Characterization of the resulting LDPE-derived graphite (LGP) for crystallinity and electrical conductivity.
• Assessment of LGP's suitability for producing graphene oxide (GO).

Main Results:

• Achieved a high carbon yield of 89.4% from waste LDPE.
• Synthesized LGP with high crystallinity and electrical conductivity, outperforming natural graphite and comparable to conventional artificial graphite.
• Demonstrated the production of larger graphene oxide (GO) flakes (4.1 ± 2.4 µm) from LGP.

Conclusions:

• The developed method effectively upcycles LDPE waste into a valuable carbon material.
• LGP is a promising precursor for advanced applications including 3D printing, flexible electronics, and photothermal devices.
• This approach contributes to sustainable plastic waste management and the fabrication of high-performance carbon materials.