Study of the Mechanical Properties of Mica-Filled Polypropylene-Based GMT Composite

摘要

Mica-filled polypropylene (PP)-based GMT (PP-mica-GMT) was prepared by a double-belt press and its mechanical properties were tested.The effect of the mica content on the mechanical properties of PP-mica-GMT was investigated.It was found that with a lower mica content in matrix the tensile and flexural properties were improved;however,at a high mica content level,the tensile and flexural properties decreased.With respect to the impact strength,there is a maximum value at an approximate 20 wt % mica content level.These results were attributed to the influence of mica on fiber-matrix adhesion.It is most likely that low mica content enhances fiber-matrix adhesion;however,high mica content is unfavorable to fiber-matrix adhesion.Maleic anhydride-grafted PP(MPP) was used to enhance the fiber-matrix adhesion at a higher mica loading level for PP-mica-GMT.With increasing MPP content in the matrix,the tensile properties were significantly improved,whereas the Izod impact strength decreased.In addition,with 5 wt % MPP and 40 wt % mica in the PP matrix formulation,the effect of the mica particle size and glass fiber content on the mechanical properties of PP-mica-GMT was investigated.