During the polymer material synthesizing process

polymer synthetic technologies can make polymer materials be composed of various lengths of molecular chains

which leads to the molecular weight distribution is polydisperse.However

this polydispersity will result in different influence on the phase behavior of different polymer blending systems.In this paper

the importance of researches on the effect of polydispersity on the phase behavior of polymer systems is described.The effect of polydispersity on the phase behavior of polymer solution

block copolymer

polymer-polymer blends

colloid-polymer blends are reviewed and the directions of future research in this field are proposed.