Figure 13: Coexistence curve (blue) and percolation line (dashed and solid green) for a solution of associative polymers undergoing UCST-style phase separation coupled to percolation.

The red lines are tie lines (see section 6.1) that connect coexisting dilute and dense phases. There are two critical temperatures, T_cs for the segregative transition and T_cp for the percolation transition. For temperatures below T_cs and above T_cp there is the formal possibility of phase separation without percolation. Whether this regime is accessible or not will depend on the gap between the two critical temperatures T_cs and T_cp.