This month I continued research on diffusion process in the polyelectrolyte multilayer films using CLSM imaging techniques. The experiment was performed at a temperature range of+25oC to +50oC. I also prepared a few variants of cross-linked and non-cross-linked samples for ATR-FTIR analysis which should gives me information about PEM coatings internal structure. The issue of chemical cross-linking was investigated in more details by a micro-hardness and AFM measurements.