Application Note:

Research has shown that fibers from polypropylene / carbon nanofiber composites can be spun using the conventional melt spinning equipment and possess superior modulus and compressive strength at 5 wt% loading of carbon nanofiber.

Source Data:

Discussion:

Research has shown that fibers from polypropylene / carbon nanofiber composites can be spun using the conventional melt spinning equipment and possess superior modulus and compressive strength at 5 wt% loading of carbon nanofiber. It is also apparent that good dispersion was obtained by melt processing the polypropylene matrix. While the observed fiber moduli have improved significantly (50%) by reinforcement with the carbon nanofibers, rules of mixtures calculations suggest that further improvements in modulus are likely, if perfect alignment and perhaps better interfacial adhesion of carbon nanofibers could be achieved in the polypropylene matrix fiber.

Top left SEM: Scanning electron micrograph (SEM) of fibers from PP/carbon nanofiber composite. The SEM shows good dispersion of the carbon nanofibers in the spun fibers.

Top right photos: Laser scanning confocal microscope images of PP/carbon nanofiber; a) at 3.6 μm and b) at 7.2 μm below the fiber skin. The layer close to the skin appears to have fewer nanofibers, while having a higher degree of orientation of the carbon nanofibers. In the layer farther away from the skin (b), the carbon nanofibers seem to be more aggregated than those at the skin of the fiber.

Bottom table: Properties of fibers from polypropylene and PP/carbon nanofiber composite. The composite fibers have higher modulus and compressive strength as compared to control PP fibers. While tensile strength was not significantly affected, strain to failure was observed to decrease as a result of filling with the carbon nanofibers.

Our Recommendation:

To improve the modulus and compressive strength of polypropylene composites, PPI recommends the following products XXX



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