Crosslinked films were prepared according to the following procedure: PrZnAc macromonomer (~20 g) dissolved in EtOAc and various ratios of methacrylated-L-DOPA (5 and 10 wt.%) was mixed homogenously in 25 ml EtOAc. Then, photoinitiator 2% w/w (Omnirad 2022) in EtOAc was inserted into the mixture. Residual solvent was evaporated under reduced pressure after a homogenous mixture was obtained. Then, the films were produced by injecting the final viscous precursor onto glass plate and spreading with a steel applicator (gap thickness: 1 mm). The precursor was then irradiated with a DYMAX Bluewave LED Prime UVA (USA) light source, with a narrow spectral range and maximum intensity at a wavelength λmax of 385 nm. The intensity of the radiation was adjusted to 20 mW/cm 2 and monitored by a radiometer, AktiPrint (Technigraf GmbH, Germany). Photocuring was carried out under air atmosphere. The exposure time was 150 seconds for across the entire plate (10 cm x 20 cm).