In this work, we introduce a new strategy to crosslink PEtOx (and potentially any other hydrophilic polymer) in the polymer melt without the need for any functionalization on POx. To this end, we employed polyperoxides (Figure ), which were obtained from 5-tert-butylperoxy-5-methyl-1-hexen-3-yne (PM), maleic anhydride (MA), and butyl acrylate (BA). The crosslinking reaction and the products were studied by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and rheology. It will be demonstrated that the crosslinking degree mainly depends on the curing temperature and crosslinker concentration. Overall, this study suggests a facile and new approach to access hydrogels potentially from almost any kind of hydrophilic polymer.