Phase diagram for irregular and non-symmetric cross-linked polymer blends

We consider a blend made of two types of polymers, and , of different chemical nature. At high temperature, the homogeneous mixture is cross-linked. As the temperature is lowered, the two species try to segregate but are kept together by the cross-links. We show that for inhomogeneous, non-regular and non-permanent cross-links, there is a complete segregation at low temperatures, if the system is just weakly cross-linked, and partial segregation otherwise. We also demonstrate that there is no phase transition between the homogeneous phase and the microphase for non-symmetric systems. Our analysis is checked with the experiment.