Flory temperature -theta tempera­ture

 Symbol θ. The unique tempera­ture at which the attractions and repulsions of a polymer in a solution cancel each other. It is analogous to the Boyle temperature of a nonideal gas. A polymer solution at the Flory temperature is called a theta (θ) solu­tion. At the Flory temperature the virial coefficient B, associated with the excuded volume of the polymer, is zero, which results in the polymer chain behaving almost ideally. This enables the theory of polymer solu­tions at the Flory temperature to pro­vide a more accurate description of events than for polymer solutions at other temperatures, even if the poly­mer solution is concentrated. It is not always possible to attain the Flory temperature experimentally. The Flory temperature is named after the US physicist Paul Flory (1910-85).