Effects of the surface treatment of wollastonite on the tensile and flow properties for reinforced polypropylene composites

摘要

The effects of the filler content and its surface treatment on the tensile and flow properties of the polypropylene (PP) composites filled with wollastonite (CaSiO_3) were investigated. The results showed that the introduction of the filler could reinforce the PP resin, while the influence of the filler surface treatment on the tensile and flow property was insignificant. The melt volume flow rate (MVR) of the composites decreased nonlin-early, while the Young's modulus increased nonlinearly with increasing filler weight fraction (φ_w); the tensile strength and tensile fracture strength increased significantly when φ_w was ＜10% and then decreased slightly with increasing φ_w. The elongation at break decreased significantly when φ_w was ＜10% and then decreased slightly with the increase of φ_w. Moreover, the Young's modulus was estimated using the equation published earlier, and a good agreement was shown between the predicted data and the measured data.