Effect of nanoparticles loading on properties of polymeric composite based on Hemp Fiber/Polypropylene

In this study, the effect of layered nanoparticles on physical, mechanical, fire, and dynamic mechanical properties of polypropylene (PP)/hemp fiber was investigated. Composites based on PP, hemp fiber, nanoclay, and maleic anhydride-grafted PPs were made by melt compounding and then injection molding. Results revealed that the tensile modulus, tensile strength, and elongation at break of composites increased with an increase of nanoparticles loading up to 3% and then decreased. However, the impact strength decreased with the increase in nanoclay loading. Also, significant reduction in water absorption and swelling thickness has been shown with increasing nanoparticles loading. The dynamic mechanical behavior and fire properties of composites were improved by the addition of nanolayered silicates. X-ray diffraction (XRD) tests clarify that the nanoparticles in the hemp fiber/PP samples are not exfoliated, and the dispersion is in need of improvement. Finally, this project has shown that the PP/hemp fiber composites treated with layered nanoparticles will be desirable as building materials due to their improved dimensional and fire stability and strength properties.