The formation and characterization of the interphase in multi-phase polymers were summarized in this paper. The interphase characteristics and their influences on properties of multi-phase polymers were reviewed as well. Emphasis was placed on discussing the effects of different compatibilizers on the interphase behavior. The influences of molecular weight and concentration of block copolymer based compatibilizers on the interphase behavior have been extensively investigated and quantitative relationships have been made. However

few investigations have been made on the effects of compatibilizers based on graft and random copolymers on the interphase behavior. It is anticipated that a quantitative correlation among interfacial tension

interphase thickness

and properties

particularly mechanical ones

of multi-phase polymers is a promising aspect in the field of polymer physics.