1-cyanoethanoyl-4-acryloyl thiosemicarbazide and its metal complexes as thermal stabilizers for rigid poly(vinyl chloride)

1-Cyanoethanoyl-4-acryloyl thiosemicarbazide (CEATS) and its metal complexe s with Sn2+, Cd2+, Co2+ ions have been investigated as thermal stabilizers for rigid poly(vinyl chloride). The results reveal that the stabilizing eff iciency of CEATS is comparable to that of the commonly used industrial stab ilizers, while the stabilizing efficiencies of CEATS complexes greatly exce ed that of the parent molecule. CEATS as a co-stabilizer with reference sta bilizers namely Cd-Ba stearates, dibutyl tin maleate, or basic lead sulfate led to a synergistic effect. A probable mechanism expressing the interacti on of CEATS molecule with metal salts stabilizers has been proposed. (C) 19 99 Elsevier Science Ltd. All rights reserved.