Abstract: Acrylate rubber （ACM）， rigid body nano-calcium carbonate （nano-CaCO3）， elastomeric butyl acrylate/methyl methacrylate/butadiene ternary copolymer （AMB） were used as tougheners to blend with poly（vinyl chloride） （PVC）. The impact properties， tensile properties， processing rheology， and dynamic thermomechanical properties of the as-prepared compounds were investigated. The results indicated that when the mass ratio of PVC/ACM/nano-CaCO3/AMB was set to be 100/10/3/9， the compounds obtain low-temperature impact strength of 27.64 kJ/m2， which was 5 times higher than that of pure PVC. Their low temperature impact strength was 14.91 kJ/m2， which was 4.1 times higher than that of pure PVC. The addition of AMB reduced the glass transition temperature （Tg） of the compounding system， resulting in a decrease in Tg from 93.71 to 86.36 oC.

Key words: poly（vinyl chloride）, toughening modification, acrylate rubber, nano-calcium carbonate, butyl acrylate/methyl methacrylate/butadiene terpolyme