Effect of methylene diphenyl diisocyanate and maleic anhydride grafted polypropylene on morphology and physical-mechanical properties of polyethylene based wood-plastic composites containing nanosilica and nanoclay

This research was conducted with the aim of investigating the compatibilizer of methyl diphenyl diisocyanate and maleic anhydride polypropylene on the morphology and physical-mechanical properties of wood-plastic composite containing nanosilica and nanoclay, high density polyethylene, wood flour. For this purpose, 3% compatibilizer along with nano particles at 3 levels of 0%, 2%, 4% were mixed with an internal mixer and test samples were prepared using the injection molding method. Then, the physical and mechanical properties of the samples such as water absorption and thickness swelling, modulus and tensile and bending resistances and impact resistance were performed on the samples. The results showed that the increase of nano particles had a positive effect on the physical and mechanical properties except impact resistance and improved them. However, the presence of nano-silica has led to an increase in the water absorption of composites. Examining the FTIR spectra and XRD patterns, the distribution of nanoclay in the field of polymer is of interlayer type, and in nanosilica, there is the accumulation of nano particles and the increase in the dimensions of the crystals in the composite. The results of bending and tensile strength were confirmed by scanning electric microscope.