Mechanical Properties of High Density Polyethylene/Modified Calcium Silicate Composites

High density polyethylene (HDPE)/calcium silicate (CS) composites containing vinyltriethoxysilane treated calcium silicate contents varying from 0-10 phr were prepared by injection molding. Thus obtained HDPE/CS composites were characterized by the thermal analyses. The mechanical properties were evaluated. It was found that the incorporation of the calcium silicate into high density polyethylene resulted in a slight increase in the yield stress (6.85-11.76 %) as well as tensile strength (7.02-12.84 %). However, the elongation at yield and the elongation at break decreased by 9.23-24.87 % and by 11.03-60.73 %, respectively, with the increasing calcium silicate content. The vinyltriethoxysilane modified CS exhibited the dispersibility in HDPE matrix arising from the compatibility between high density polyethylene matrix and the disperse phase (treated calcium silicate particles) which led to the effect on the mechanical properties of the composites. It could be concluded that the modified calcium silicate played a role in reinforcing the mechanical properties into the high density polyethylene.