Abstract: Influence of blending effect of two kinds of amphiphilic polymer,B-type and Haibo Ⅲ-type,for oil displacement on their emulsion stability and emulsifying power was studied with stability analyzer and optical microscope.With mobilometer,interface tensiometer and Zeta potential analyzer,rheological performance and interfacial characteristics of the two kinds of amphiphilic polymer as well as their blend systems were studied.Results showed that both separate kinds of amphiphilic polymer for oil displacement and their blend systems can form O/W emulsions.With the increase of B-type amphiphilic polymers,the size of droplets of the blend system emulsion lie between that of two kinds of amphiphilic polymer emulsions,and the size of the emulsion droplets decreases and the distribution become narrow.At the same time,the viscosities of external phases,oil-water interfacial tensions and the absolute values of Zeta potentials of different blend systems increase firstly and then decrease.Under comprehensive functions,the migration rate of droplets of the blend system emulsions decrease and the degrees of flocculation and coalescence increase firstly and then decrease.Comparing with the emulsions prepared by two kinds of amphiphilic polymers,stability of the emulsions prepared by their blend systems reduce firstly,and then increase to the highest value.

Key words: amphiphilic polymers, blend system, emulsification performance, stability, migration rate, interfacial activity, rheological performance