Controllable synthesis of poly(methyl methacrylate-1-decene)as viscosity index improver
The copolymerization of methyl methacrylate and 1-decene initiated by azodiisobutyronitrile(AIBN)in xylene solution was studied using Schiff base Ni complex as catalyst.The process conditions of the polymerization reaction were optimized by single factor method.The structure and properties of the polymer were characterized by GPC,FT-IR,1H NMR and TGA,and its viscosity-temperature perform-ance was evaluated.The results show that when the mass ratio of 1-decene to MMA is 1∶2,the amount of initiator is 0.5％of the total monomer mass,and the molar ratio of catalyst to initiator is 1∶100 at 90 ℃for 10 h,the catalytic activity is 1.021×105g·mol-1·h-1.The number average molecular weight of the copolymer(PDM)ranges from 1.05×104 to 1.26×104 and the polydispersity index PDI ranges from 1.31 to 1.82,the reaction is controllable.The initial decomposing temperature of copolymer is 264 ℃,indi-cating that the polymer has good thermal stability.Adding 0.5％copolymer to the Yumen lubricating base oil can increase the viscosity index by 31.Therefore,the copolymer PDM can be used as a viscosity in-dex improver.
Schiff-basecontrollable synthesis1-decenemethyl methacrylateviscosity index improver
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