Application Note:

Adding Pyrograf Products, Inc.’s vapor grown carbon fibers (VGCFs) significantly improves the mechanical properties of thermoplastic composites.

The VGCF/polypropylene composites had double the tensile strength and quadruple the modulus of unreinforced polypropylene. The VGCF/nylon composites had double the modulus and slightly improved tensile strength compare to unreinforced nylon. Ball milling the VGCF prior to incorporation into the thermoplastics appeared to aid dispersion of the fibers and improve the mechanical properties of the composite material.

Source Data:

The photomicrographs (on left) show that ball milling Pyrograf Products, Inc.’s vapor grown carbon fibers (VGCFs) (in as-grown condition) for 1-2 minutes easily reduces the size of the fiber balls. Ball milling to reduce the size of the clumps to just less than 300 μm significantly improved the mechanical properties of both types of thermoplastic composites (nylon and polypropylene).

VGCF/nylon composites had slightly improved tensile strength and double the modulus of unreinforced nylon. VGCF/polypropylene composites had double the tensile strength and quadruple the modulus of unreinforced polypropylene (graphs on right).

Our Recommendation:

To improve the mechanical properties of thermoplastics, PPI recommends the following products XXX



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