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Thermal Stability Study of some Metal Carboxylates of Castor (Ricinuscommunis) Seed oil on Poly(vinyl chloride)

Author Affiliations

  • 1Chemical Sciences Department, Ondo State University of Science and Technology, P. M. B. 353, Okitipupa, Nigeria

Res.J.chem.sci., Volume 6, Issue (2), Pages 23-28, February,18 (2016)

Abstract

Barium, calcium, magnesium and zinc carboxylates of castor seed oil (CSO) were prepared by metathesis in aqueous ethanol. The FTIR spectra of the carboxylates showed two asymmetric vibrations and two symmetric vibrationsof the carboxylate group. The two asymmetric vibrations occurred in the range 1573 - 1535 cm-1 while the two symmetric vibrations were observed in the range 1491 - 1409 cm-1indicating the binding mode of the carboxylate groups to the metal ion and confirmed their formation. PVC thermal stability investigation was carried out by static stability test at 160 and 180oC, and thermogravimetric analysis. The results revealed that the oil, the metal carboxylates and their mixtures stabilized PVC against thermal degradation. Based on static stability time, tss and temperature of onset of thermal degradation, Tonset, Ba-CSO was the most effective and the order of PVC stabilization by the metal carboxylates is Ba-CSO > Mg-CSO >Ca-CSO > Zn-CSO. The results also indicate that the mixed metal carboxylates are more effective than individual metal carboxylates.

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