Then, 1-mm-thick films were produced by pouring the final composition onto glass plate and spreading with a steel applicator. The composition was then irradiated with a DYMAX Bluewave LED Prime UVA (USA) light source, with a narrow spectral range and maximum intensity at a wavelength λ max of 385 nm. The intensity of the radiation was adjusted to 20 mW/cm 2 with the help of radiometer, AktiPrint (Technigraf GmbH). Photocrosslinking was carried out in air atmosphere, as well as under argon, in a glove box. The exposure time was 150 seconds for each spot (2.25 cm 2 ) and was carried out stepwise across the entire plate (10 cm x 20 cm).