The PVC/ACS blends were modified with inorganic fillers,and toughened with rubber.The results showed that the flexural modulus of the blends increased significantly,while tensile strength and Izod notched impact strength of the blends decreased gradually with the increment of calcium carbonate or talc.And the addition of talc was positive to the improvement of heat deflection temperature(HDT).Further,the treatment of the surface of the fillers with coupling agent got an improved compatibility degree of allo...