Asian Journal of Research in Chemistry

B. Sehgal ¹, G. B. Kunde ²

Affiliations
1 Department of Applied Chemistry, Maharaja Sayajirao University of Baroda, Vadodara-390001, Gujarat, IN
2 Datta Meghe College of Engineering, Dept. of Applied Chemistry, Navi Mumbai, Maharashtra, IN

Abstract

A comparative study of oxidation stability of biodiesel prepared via transesterification and sonication routes was carried out. The polyphenols from tea extract, while acting as an antioxidant could prolong the onset of degradation by about two weeks. Difference in viscosity and peroxide value were used as an indicator of oxidation. Though the polyphenols could not prevent a viscosity increase that corresponds to the beginning of rapid polymerisation but the rate of the increase was quiet slow. Polyphenols from tea extract stabilizes the methyl ester by reducing the rate of peroxide formation and by stabilising the viscosity. A sudden rise of viscosity was attributed to onset of secondary oxidation marked by an increased release of free fatty acid. The onset of secondary oxidation showed a marked delay in ultrasonicated samples as compared to transesterification.

Keywords

Transesterification, Sonication, Peroxide Value, Antioxidant.

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B. Sehgal ¹, G. B. Kunde ²

Affiliations
1 Maharaja Sayajirao University of Baroda, Department of Applied Chemistry, Vadodara-390001, Gujarat, IN
2 Datta Meghe College of Engineering, Dept. of Applied Chemistry, Navi Mumbai, Maharashtra, IN

Abstract

The behavior of polymer blend depends on the properties of the individual components in the blend, the proportion in which they are present in blend and the structure and morphology of the blend. The structure of the dissolved molecules of the blend in the polymer-polymer mixture plays a major role in the molecular state of dispersion, the adhesion between the phases and consequently influences most of the properties and applications. In the present study we have made use of grafting of a polymer on to the natural rubber backbone leading to chemical modification of the poly-isoprene allylic double bond system. This type of modification leads to a change, not only in chemical properties but physical properties as well, like increased hardness, strength with decreased tackiness and the blend behaves like a thermoplastic rubber without making use of vulcanization. In order to optimize the processing conditions, the properties like miscibility characteristics, torque and melt viscosity were studied.

Keywords

PVC (Poly Vinyl Chloride), NR (Natural Rubber) ENR (Epoxidised Natural Rubber), PMMA (Polymethyl Methacrylate).

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