Poly(vinyl chloride) composites were prepared via a melt blending filled with CaCO3 nanoarticles

which were pretreated with titanate coupling agent and stearic acid respectively.The effects of different agents on the microstructure of composites

the interfacial cohesion of CaCO3/PVC and the mechanical properties of composites were studied. The microstructure of CaCO3/PVC nanocomposites was characterized by scanning electron micrograph

and the interfacial cohesion between CaCO3 particles and PVC matrix was determined by dynamic mechanical analysis experiments. It was found that CaCO3 nanoparticles were uniformly dispersed in PVC matrix and had a good interfacial cohesion with the matrix after treatment with titanate coupling agent. A little amount of nanoparticles agglomeration and some cavities were found after treatment with stearic acid

while a lot of agglomeration and cavities occurred when filled with untreated CaCO3 nanoparticles.Better interfacial cohesion and stronger interfacial adhesion strength were obtained after the inorganic filler was pretreated with titanate coupling agent

with which the PVC composites filled had lower equilibrium torque

higher tensile strength and notched impact strength. The notched impact strength of composites reached 26.5 kJ8226;m-2

which was about 4 times as high as that of neat PVC composites

when the mass ratio of nano-CaCO3/PVC was 20/100.