To further assess the obtained photocured polymer networks, we performed swelling tests according to EN ISO:175 using chlorobenzene. The obtained results confirmed our hypothesis regarding the differences in the density of polymer networks. Further, in this case, the results (Fig. and SI Table ) clearly showed differences between the foils cured under air and under argon, indicating an influence of oxygen inhibition on the curing process. The differences between the results arise from differences between the methods. In assessing gel fraction, the loss of material in solvent was measured, whereas in the swelling test the solvent uptake was determined. with different concentration of the Mg-Ti butoxide catalyst (from 0.1 to 1 mol %). Additionally, we wanted to compare their mechanical profiles at 37 °C, from the point of view of potential medical applications. After photocuring using the same photoinitiator concentration and irradiation exposure, but under different atmospheres (air vs. argon), the obtained elastomeric thin films were subjected to dynamic mechanical thermal analysis in a tensile mode. The results, in a form of temperature dependence of the storage modulus (E'), loss modulus (E''), and the tangent of the phase angle (tan δ) are presented in Figure (the numerical values are presented in Table ). Interestingly, the values of the storage modulus, E' (Figure ), representing elastic behavior in viscoelastic polymers, indicated that within the glassy state region (below -20°C), there are some significant differences in polymers stiffness (values of E' differ from ~600 MPa to ~1100 MPa), independent of the curing atmosphere and the catalyst concentration. After the phase transition, all of the polymer networks photocured under the same atmosphere exhibit comparable elasticity (more details in Table ). However, overall samples cured under argon were less elastic, as compared to those cured under air atmosphere (i.e. 0.2 versus 0.078 MPa for 0.1 mol% catalyst concentration). This effect is most likely due to the lower conversion of macromonomers for the case of samples photocured in air atmosphere, due the negative effect of oxygen inhibition. The resulting lower crosslinking density would result in more space for macrochains to arrange. Additionally, possible residual unreacted macroradicals, captured in the polymer network, can act as lubricants. Combined these two factors are likely responsible for the observed increase in elasticity. For the case of the sample prepared from macromonomers synthesized with 1 mol% of catalyst and photocured under argon atmosphere, fractured occurred during the measurement. This is likely due to its relatively low crosslinking density, related to a low degree of macromonomer acrylation.