Miscibility and phase separation in polypropylene blends

Blends of polypropylene (PP) with other polymers are used widely and are of great commercial importance. Many of these are immiscible at all compositions and temperatures of interest; for example, the blends of PP and polyamides (PAs) that are used in fiber applications are highly incompatible. However, recent work has shown that PP is miscible with a number of other polyolefins, and the strength of the interactions between these polymers has been measured. Here the data that have been obtained on PP blend miscibility are compiled and work on the kinetics of phase separation for such blends is described.