Three crosslinked films with different ratios of hydrophilic and hydrophobic monomers were prepared using trimethylene carbonate backbone with ester free structure. Oligo(ethylene glycol) (OEG) was selected as hydrophilic moieties due to the high mobility, hydrophilicity and biocompatibility. The obtained crosslinked films were evaluated by thermal properties, mechanical properties, surface properties, and protein adsorption. The results showed soft properties with high biocompatibility, depending on the introduction rate of OEG.