Abstract: The static and dynamic stabilities for PVC was compared for combination of ester-tin with various assistant stabilizers including stearate, epoxide, and alkyl tin by means of congo red rheometer. By compounding ester-tin with Ba/Zn and alkyl tin, the heat stability time increased from 32 min to 49 min and 32 min to 57 min, respectively. A good synergistic effect was observed when epoxide was used as an assistant stabilizer. The combination of ester-tin with alkyl tin not only resulted in a better transparency, but also a better dynamic thermal stability at high temperature than with Ca/Zn. After UV irradiation of 72h, the remaining tensile strength was 98.14 % and elongation at break was 91.71 %.

Key words: poly (vinyl chloride), thermal stability, compound, ester-tin