# Flory Huggins Theory

For an ideal chain, Flory Huggins theory gives us a distribution which is like a Gaussian.

$$P(l, r) \sim \left(\frac{3}{2 \pi l^2}\right)^{3/2} e^{\frac{-3 r^2}{2 l^2}}$$

where, $l$ is the monomer to monomer distance(also known as Kuhn length) and $R$ is the size of the monomer

This is great but what are the approximation away from an ideal chain polymer? I want to understand how one can go beyond Flory Huggins Theory.