The changes in tan δ, a dimensionless parameter that does not represent any physical quantity directly, but is a measure the ratio of energy dissipated to energy stored with periodically variable deformation, are presented in Figure . The analysis of damping properties (relation of E'' to E') revealed that samples photocured under argon atmosphere more effectively suppress mechanical vibrations, most likely due to higher cross-linking density and their overall viscoelastic properties. Analyzing the influence of catalyst concentration on the damping properties of polymer networks, that the highest values of tan δ (at the reference temperature point of 37 °C) were noted for samples where 0.5 mol% catalyst was used during the macromonomer synthesis. This result is correlated with these samples having the highest values of gel fraction, lowest swelling degrees, and the macromonomers having the highest acrylation degrees.