This leads to a miscibility gap between pigeonite and augite compositions. The mechanical mixtures have total or partial miscibility gap in solid state. In a stricter sense, thermoresponsive polymers display a miscibility gap in their temperature-composition diagram. Due to the low entropy of mixing, miscibility gaps are often observed for polymer solutions. DMA can also be used to effectively evaluate the miscibility of polymers. Random mixing therefore always favors miscibility and opposes phase separation. Typical methods for introducing varying degrees of water miscibility are similar to other resin systems. However, poor miscibility between the waste rubber and polystyrene will weaken the material. The binodal curve forms the basis for the miscibility gap in a phase diagram. Miscibility of two materials is often determined optically. Therefore, the fact that miscibility gaps are observed can only be explained by interaction.