Production and application properties of dispersive viscosity index improvers (CROSBI ID 185809)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Šoljić Jerbić, Ivana ; Parlov Vuković, Jelena ; Jukić, Ante
engleski
Production and application properties of dispersive viscosity index improvers
Polymeric dispersive viscosity index improvers of lubricating mineral oils based on styrene, dodecyl-methacrylate, octadecyl methacrylate and N, N-dimethylaminoethyl methacrylate (d-PSAMA) were produced by performing copolymerizations isothermally up to the high-conversion in mineral base oil solution, using monofunctional or bifunctional peroxide initiator. The obtained kinetics results reveal the benefits of the usage of a bifunctional peroxide initiator over a monofunctional, since complete conversion of monomers was accomplished in the shorter reaction time, performing the process in a full batchwise mode. When the bifunctional initiator was applied the required polymerization temperature was slightly higer (105 oC) and copolymers of higher average molecular weight values (Mw = 60-120 kg mol-1) were obtained while in case of the monofunctional peroxide initiator the reaction temperature was 100 oC and average molecular weight values of copolymers were Mw = 30-100 kg/mol. Investigated application properties demonstrated that d-PSAMA additives were fully comparable with conventional pure methacrylate additives and also, it provided other advantages such as higher viscosity index and kinematic viscosity, lower values of pour point temperatures as well as better dispersant and detergent properties. Thus, increasing the N, N-dimethylaminoethyl methacrylate share in copolymers from 2 to 10 mol.% their weight average molecular weight decreased from 120 to 60 kg mol-1, while kinematic viscosity values at 100 oC remain high and amounted 14.5 ± 0.5 mm2 s-1.
styrene ; methacrylate ; N, N-dimethylaminoethyl methacrylate ; bifunctional peroxide initiator ; copolymerization ; conversion ; molecular weight ; viscosity ; dispersive viscosity index improvers ; lubricating mineral oils
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Podaci o izdanju
51 (37)
2012.
11914-11923
objavljeno
0888-5885
1520-5045
10.1021/ie301010n