Phase behaviour studies have identified hydrogen bonding as a key aspect in polymer solubility in fluorinated liquids, both in terms of solute-solvent and solute-solute interactions. We propose a SANS experiment to explore the balance of these two terms using mixtures of fully (non-hydrogen bonding) and partially fluorinated (hydrogen bonding) solvents, and polymers which are -OH or CH3- end-capped to vary their hydrogen bonding capacity. Changes in polymer solution conformation (radius of gyration) due to changing solute-solvent interactions (intermediate Q range), and the formation of polymer clusters due to solute-solute interactions (enhanced scattering at low Q values) will be studied as a function of temperature and/or solvent composition across the phase diagram, to identify which interactions are most important in determining the phase behaviour.