engleski

Polyolefin and poly(alkyl methacrylates) mixtures as solution rheology modifiers

The miscibility and intermolecular interactions between two uncharged polymers, poly(ethylene-co-propylene) (EPC) and poly(alkyl methacrylates) (PAMA), namely: poly (methyl methacrylate) (PMMA), poly(dodecyl methacrylate) (PDDMA) or poly(octadecyl methacrylate) (PODMA), in dilute xylene solution at 30 o^C were thoroughly investigated by viscosity measurements. Also some rheological properties of mineral lubricating oils containing ethylene/propylene copolymer and poly(alkyl methacrylate) mixed additives have been examined. Based on the ratio of specific viscosities at 40 and 100 o^C (Q) the OCP additive solution showed a better thickening effect at lower temperatures (Q << 1) and the PAMA at higher temperatures (Q > 1). The mixed polymer additive containing ~10 wt. % OCP and ~90 wt. % PAMA is a nearly ideal candidate for the viscosity index improver showing the same thickening effect at different temperatures.

Poly(ethylene-co-propylene)/Poly(alkyl methacrylate) blends; Viscosity; Miscibility; Lubricant Rheology

nije evidentirano