Abstract: This paper studied the effect of ABS on the mechanical properties, Vicat softening point, and flame retardant performance of CPVC/ABS/AS and CPVC/ABS blends. In the CPVC/ABS/AS system, with the loading of ABS increased from 0 to 30 %, the impact strength was increased from 11.5 to 39.3 kJ/m2. In CPVC/ABS system, with the loading of ABS increased from 0 to 25 %, the impact strength was increased from 11.1 to 52.6 kJ/m2, but the tensile and flexural strengths, Vicat softening point of the blends were reduced. Moreover, the flame retardant performance of the blends was mainly related to the content of CPVC. When CPVC/ABS (or ABS+AS)=6∶4, the limited oxygen index was about 31 %.

Key words: chlorinated poly(vinyl chloride), acrylonitrilebutadienestyrene copolymer, acrylonitrilestyrene copolymer, blending, mechanical property