Abstract
Epoxidized sunflower oil (ESO) and epoxidized sunflower oil methyl ester (ESOME) were synthetized and employed as secondary bio based plasticizers and combined with primary natural plasticizers. As such, di-esters isosorbide (DEI) and acetyl tributyl citrate (ATBC) used in Poly Vinyl Chloride (PVC) as compared to di-(2-ethylhexyl) phthalate (DEHP). PVC Sheets were obtained by processed the polymer and its additives on two-roll mill. The effect of the plasticizers combination on flexible sheets properties, including stabilization, migration, fusion rheological properties and light transmission have been discussed, Results have shown that ESO and ESOME have improved PVC formulations thermal stability, the weight loss by volatility has decreased in the formulations which contained ESO or ESOME. Mixtures of plasticizers have lower migration rates. Plastograph test has indicated a better compatibility of PVC with these plasticizer mixtures. The light transmission rate through PVC sheets plasticized by bio-based plasticizers mixtures is more than those containing DEHP.
Highlights
Polyvinyl chloride (PVC) has a wide range of applications on human health[11] by using some derivatives of vegetable in various fields that have several advantages such as oils, such as, soybean oil, linseed oil and sunflower oil, and product performance, material processing capability, thermal stability, relatively low cost and versatility
Regarding the dynamic thermal stability plateau in torque/ time curves, where the time at which the torque is constant is considered as a stability time[41], we observe that Epoxidized sunflower oil (ESO) or epoxidized sunflower oil methyl ester (ESOME) increases the stability time once incorporated in the plasticizer systems. This confirms the results of Thermal gravimetric analysis (TGA), where the epoxide function reacts with the HCl released by the PVC dehydrochlorination reaction and limits the autocatalytic role of HCl in PVC degradation
The decrease in mass loss by volatility in formulations containing ESO or ESOME in their plasticizer system can be explained by the reaction of the epoxide function and the HCl produced by the dehydrochlorination of PVC
Summary
Polyvinyl chloride (PVC) has a wide range of applications on human health[11] by using some derivatives of vegetable in various fields that have several advantages such as oils, such as, soybean oil, linseed oil and sunflower oil, and product performance, material processing capability, thermal stability, relatively low cost and versatility. It has been used with various additives such as thermal stabilizers, plasticizers, lubricants, fillers ...etc, according to the application or depending on desired properties[1,2]. With its esterification by an alcohol improves the plasticizing effect on PVC and the resistance to migration against DEHP[22]
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