Crosslinked Polyethylene (XLPE) Recycling via Foams

Area of Science:

• Materials Science
• Polymer Chemistry
• Recycling Technology

Background:

• Chemical crosslinking in polyethylene (PE) hinders efficient recycling and manufacturing.
• Developing effective methods for crosslinked PE recycling is crucial for sustainability.

Purpose of the Study:

• To investigate a simple processing method for recycling crosslinked PE.
• To evaluate the impact of incorporating recycled crosslinked PE into rigid polyurethane (PU) foam.
• To analyze the effects of varying crosslinked PE concentrations on foam properties.

Main Methods:

• Generation of crosslinked PE into solid waste powder.
• Particle fining for improved dispersion.
• Incorporation and dispersion of treated crosslinked PE within rigid PU foam.
• Analysis of foam microstructure, mechanical strength, and thermal properties.

Main Results:

• Achieved uniform pore distribution and controlled microstructure in PU foam with crosslinked PE.
• Maintained foam strength while improving thermal degradation resistance.
• Demonstrated significantly enhanced thermal capabilities of the composite material.
• Successfully dispersed processed crosslinked PE within the PU matrix.

Conclusions:

• Simple mechanical processing of crosslinked PE is effective for recycling.
• Incorporating recycled crosslinked PE into PU foam offers enhanced material properties.
• This approach presents a viable pathway for recycling substantial quantities of crosslinked PE for applications in food packaging, insulation, and sound reduction.