S. A. Umoren, I. U Umoren, A. S. Johnson


The effect of metal soaps of Hura crepitans seed oil prepared using Cd, Ba, Zn and Ca salts on thermal stability of unplasticised polyvinyl chloride (UPVC) films obtained by solvent casting is reported. The results show that the derivatives of the seed oil exert stabilizing effect on the UPVC against thermal degradation. The effectiveness of the metal soaps was found to be in the order: Cd > Ba > Zn > Ca. The mechanism of stabilization may probably be due to the replacement of labile chlorine atoms within the polymer structure with carboxylate groups which are more stable to heat treatment.



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