Temperature-concentration diagram of polymer solutions

Starting from a tricritical approach to the polymer theta point, we deduce a (T, C) diagram for polymer solutions where T is the temperature, C the monomer concentration. We define four different regions in this diagram. For each of these regions we calculate the T, N, C, dependence of the mean square end to end distance of a chain, the screening length, the osmotic pressure, and the second virial coefficient. We also give a scaling form for the equation of state.