Abstract: In this paper,the morphologies of polymer particles in polyether polyol(POP)have been observed,which was prepared from styrene and acrylonitrile by using dispersionpolymerization in polyether polyol under various conditions.It has been found that techno-logical conditions can change the morphologies of the particles and then affect the propertiesof POP.Aggregation of the particles is a main factor that influences the stability and viscosi-ty of the dispersion. Separate spheres with smooth surface can be obtained under suitableconditions and the corresponding POP is of lower viscosity.

Key words: polyether polyol, dispersion polymerization, styrene, acrvlonitrile, macromono-mer, viscosity, electron microscope