Amphiphilicnetworks segregated in hydrophilic and hydrophobic domains are veryattractive materials because they show unique properties related tothe combination of both components. In this work, these types of networkshave been obtained in a very simple way by a single standard bulkradical photocopolymerization of vinylpyrrolidone, and n-butyl methacrylate, in the presence of 1 mol % of cross-linkerswith different methacrylate or VP-like functionalities. The cross-linkerfunctionalities have been shown to have a strong influence on thesol content and on the different properties of the materials, suchas segregation or the variation of the storage modulus with temperatureand hydration. The compositional data of the polymeric chains of thissol content are in good agreement with the theoretical predictionof the polymerization carried out assuming that the reaction may bedescribed compositionally by the terminal model. The most efficientcross-linking was obtained using an asymmetric cross-linker bearingsimultaneously methacrylate and VP-like groups. [ABSTRACT FROM AUTHOR]