Overall, a similar picture is observed with the other crosslinker (P[PM-co-BA-co-MA]). In this, the relative content of peroxide groups is lower at 20 mol %. It could be expected that the decreased PM content leads to an increase in EWC. However, no major difference in EWC was observed (Figure ). We think that the presence of hydrophobic BA monomer units leads to reduced swelling of the hydrogels. Important to note, the obtained hydrogels appeared also much weaker during handling, which is in line with the lower crosslinking. the temperature may influence the swelling and therefore the mechanical properties of hydrogels , we investigated the influence of the incubation temperature (25, 35 and 60 °C) during the swelling (Figure ). It should be noted that all hydrogels were allowed to equilibrate for 60 min. In control experiments, we also incubated for 36 h, but no significant influence on EWC was observed.