Repository of Research and Investigative Information

Repository of Research and Investigative Information

Dezful University of Medical Sciences

Poly(n-octyl methacrylate) viscosity index improver: Kinetic study via on-line 1H-NMR technique

(2016) Poly(n-octyl methacrylate) viscosity index improver: Kinetic study via on-line 1H-NMR technique. Polymer Science - Series B. pp. 675-680. ISSN 15600904 (ISSN)

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Official URL: https://www2.scopus.com/inward/record.uri?eid=2-s2...

Abstract

The free radical solution polymerization of n-octyl methacrylate has been studied in benzene-d6 in the presence of 2,2′-azobisisobutyronitrile as thermal initiator. An on-line nuclear magnetic resonance spectroscopy was applied to record the reaction data and to determine the monomer conversion at different times during the polymerization reaction. Effect of monomer and initiator concentration as well as reaction temperature on polymerization rate was studied. The order of the reaction with respect to initiator (0.45) was consistent with the classical kinetic rate equation, while the order of reaction with respect to monomer (1.87) was much greater than unity. An overall activation energy (Ea = 53.8 kJ/mol) was obtained over the temperature range 328−338 K. Also, the efficiency of the synthesized poly(n-octyl methacrylate) for improving the viscosity index of the lube oil was investigated. © 2016, Pleiades Publishing, Ltd.

Item Type: Article
Keywords: Activation energy Free radicals Magnetic resonance spectroscopy Monomers Nuclear magnetic resonance spectroscopy Polymerization Viscosity Azobisisobutyronitrile Free radical solutions Initiator concentration Kinetic rate equation Polymerization rates Polymerization reaction Reaction temperature Viscosity index improvers Free radical polymerization
Page Range: pp. 675-680
Journal or Publication Title: Polymer Science - Series B
Journal Index: Scopus
Volume: 58
Number: 6
Identification Number: https://doi.org/10.1134/S1560090416060087
ISSN: 15600904 (ISSN)
Depositing User: مهندس مهدی شریفی
URI: http://eprints.dums.ac.ir/id/eprint/479

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