NU 2020-149

INVENTORS
John Torkelson*
Tong Wei

ABSTRACT
Low density polyethylene (LDPE) is one of the most produced and consumed polymers worldwide. However, due to the poor wear and abrasion resistance, the application of LDPE under continuous friction is limited. This Northwestern technology improves the wear resistance of LDPE by incorporating nanofillers and covalent crosslinks. Using solid-state shear pulverization (SSSP), the inventors are able to prepare crosslinked nanocomposite powder precursor containing as-received graphite and undissociated dicumyl peroxide (DCP). The LDPE/graphite nanocomposite powder precursor is further consolidated and crosslinked under molten condition. This precursor in the powder form contains well-dispersed unreacted DCP and exhibits versatile melt processability that are compatible with techniques such as compression molding, rotational molding, melt extrusion and injection molding. This technology could reduce the wear resistance of neat LDPE by 88% in the optimum case.

APPLICATIONS  

• Nanocomposite powder precursors for use in packaging, abrasion-resistant parts, etc

ADVANTAGES  

• Cost-effective
• Lower material costs
• Greater versatility in melt processability
• Increased dispersion of unreacted DCP in manufacturing processes like compression molding, rotational molding, melt extrusion and injection molding

IP STATUS
A US patent application has been filed.