We have previously observed formation of polymer-surfactant films at the air-water interface having a range of structures including 2D hexagonal, bicontinuous cubic and lamellar when using cat-anionic surfactant mixtures. These films form with biocompatible polymers leading us to investigate biomedical applications. Unfortunately the surfactant mixtures are toxic and attempts to replace them by less harmful surfactants have met with limited success. Thus we are now investigating altering the polymer to retain the initially templated mesostructure after surfactant removal by incorporating hydrophobic alkyl chains on the polymer backbone. These are expected to insert into the micelles during film formation and cross-linking the films will immobilise these hydrophobic clusters. Here we wish determine whether this is indeed the case, and how the polymer structure affects film mesostructure.