SOLID-STATE SHEAR PULVERIZATION AS EFFECTIVE TREATMENT FOR DISPERSING LIGNOCELLULOSE NANOFIBERS IN POLYPROPYLENE COMPOSITES (PPT)

摘要

The LCNFs, which were produced by the fibrillation of wood flour, were 20 nm to 1 urn in width. Freeze-dried LCNFs were dispersed by the SSSP treatment for 30 min using a kneader. The crystallization rate of the composites was improved with the increase in dispersion of the LCNFs through the SSSP treatment. The improved LCNF dispersion increased the Young's moduli, yield strengths, and toughnesses of the composites. Even the composites that contained a small amount of the LCNFs (5 wt%) exhibited higher Young's moduli and yield strengths than those of the neat matrix. The reinforcing effects of CNFs and LCNFs were same in the composites prepared by the SSSP treatments. The nano-fibrillation of wood filler improved the impact strength of the composites.