Thermal stability of plasticized poly(vinyl chloride) compounds stabilized with pre-heated mixtures of calcium and/or zinc stearates

Stabilizing Effect of Metal Carboxylates of Balanites aegyptiaca Seed Oil (BSO) on Poly(vinyl chloride)

“…Many researchers have reported on the enhancement of stabilizing effect of metal carboxylates in the presence of epoxidized oils (Egbuchunam et al, 2007;Boussoum et al, 2006;Gonzalez-Ortiz et al, 2005). The effect of the native and epoxidized oils on zinc carboxylate of the oil was investigated and the result is presented in Table 7.…”

“…Autocatalytic nature of thermal degradation of PVC and its poor thermal stability make the use of thermal stabilizers during processing imperative (Boussoum et al, 2006). Many compounds (organic and inorganic) have been used as PVC thermal stabilizers (Folarin & Sadiku, 2011) however, metal carboxylates stand out and many had been prepared from pure fatty acids and seed oils (Essien et al, 2012;Folarin et al, 2011a;Folarin & Enikanoselu, 2010;Fang et al, 2009;Egbuchunam et al, 2007;Okieimen et al, 2006;Egbuchunam et al, 2005;Gonzalez-Ortiz et al, 2005;Balkose et al, 2001). Seed oils will remain viable source of PVC thermal stabilizers as a result of their fatty acid contents and availability from different plant sources.…”

Effect of Di(2‐ethyl hexyl phthalate)/Epoxidized Soybean Oil and Calcium Stearate/Zinc Stearate Ratios on the Tensile Properties of Plasticized PVC Formulations. A Study for Calcium Stearate Rich Formulations

“…[18] Besides, in the catalytic presence of ZnCl 2 , epoxidized compounds react with such chloride to produce a chemical compound that is able to remove allylic chlorine atoms in PVC chains through an etherification reaction. [1] In two previous papers, [19,20] two series of materials (the first one used preheated stearates [19] and the second one used non-preheated stearates [20] ) were characterized, measuring the HCl evolved by pellets heated at 170 8C and the color evolution of ribbons heated at 175 8C, as well as the stress-strain behavior of the materials without post-processing. To extend the characterization of the materials considered in such studies, in this paper some of these formulations were processed again to obtain ribbons, by using the same preparation procedure described in these studies.…”

“…To extend the characterization of the materials considered in such studies, in this paper some of these formulations were processed again to obtain ribbons, by using the same preparation procedure described in these studies. [19,20] The newly processed samples were heated at 120 8C or 150 8C, and characterized by measuring the changes on the tensile properties produced by the degradation process.…”

Effect of zinc soaps of rubber seed oil (RSO) and/or epoxidised rubber seed oil (ERSO) on the thermal stability of PVC plastigels

“…There are a number of studies regarding the use of zinc stearate and/or epoxidised oil as heat stabilizer for PVC [1,9,10]. The carboxylates derived from zinc have strong Lewis acidity and are able to scavenge HCl and react with the allylic chlorine atom resulting in the formation of ZnCl 2 which promotes dehydrochlorination of PVC [7,11].…”