Stabilizing effect of epoxidized sunflower oil as a secondary stabilizer for Ca/Hg stabilized PVC

Abstract

Unsaturated triglyceride oil sunflower was epoxidized and characterized by chemical and spectroscopic methods. Epoxidized sunflower oil (ESO) was used as an organic thermal co-stabilizer for rigid poly(vinyl chloride) (PVC) in the presence of tricalcium dicitrate (Ca3(C6H5O7)2) and mercury (II) acetate (Hg(CH3COO)2). The thermo-oxidative degradation of PVC was studied in the presence of these ternary stabilizer systems at 170, 180, 190 and 200°C in N2 atmosphere. The effects of metal carboxylate combination Ca/Hg in the absence and in the presence of epoxidized sunflower oil on static heat treatment of PVC have been studied. The formation of polyene sequences was investigated by UV-visible and FT-IR spectroscopy and by comparing viscosity data obtained in the presence and in the absence of the additives. It was found that the additives retard the rate of degradation and reduce the extent of polymer chain scission associated with the thermal degradation of poly(vinyl chloride). Synergistic effects were found when stabilizer was blended in 50:50 weight ratios with either. It was found that ESO exerted a stabilizing effect on the degradation of PVC. The activation energy for degraded PVC in absence of stabilizers was 38.6 kJ•mol–1 and in the presence of Ca/Hg and Ca/Hg/ESO were 53.3 and 64.7 kJ•mol–1 respectively. In order of compare the efficiency of the epoxidized sunflower oil with these metal soap stabilizers, thermal stabilities were evaluated on the basis of evolved hydrogen chloride determined by conductometry technique and degree of discoloration are discussed

From Epoxidized Linseed Oil to Bioresin: An Overall Approach of Epoxy/Anhydride Cross‐Linking

“…[23] These transformations contributet o positive effects on the thermals tability. [24,25] Biorenewable resources can be used as green monomers to design tailored structures for formulations that can play an important role as functional materials. The choice of optimal structures depends on the targeted properties and applications.…”

Polyvinyl alcohol:starch:carboxymethyl cellulose containing sodium montmorillonite clay blends; mechanical properties and biodegradation behavior

“…These materials not only provide the convenience for daily life but also minimize the impact to the environment after being used. In the long run, these materials will decompose into small environmentally friendly molecules and be handled in properly controlled environment (Taghizadeh et al [2008]; Rath and Singh [1998]). In the quest for improved performance from polymers that offer biodegradation and therefore environmental acceptability, one approach is adding MMT-Na to produce nanocomposites (Averous [2004]).…”

Mechanical and Thermal Properties of Polyvinyl Chloride Plasticized with Natural Fatty Acid Esters

“…They act as internal lubricant and as stabilizers too. The epoxidized fatty acids can capture acid groups through catalytic degradation of their epoxide groups, thus the final product is stabilized [25,26].…”

“…They act as internal lubricant and as stabilizers too. The epoxidized fatty acids can capture acid groups through catalytic degradation of their epoxide groups, thus the final product is stabilized [25,26].A complete study of the curing process is necessary in order to replace traditional plasticizers for the natural ones for optimizing their industrial applications: curing temperature, curing times and optimal amount of plasticizer. …”