Porous polymeric monoliths were prepared via electron beam triggered free radical polymerization of (meth)acrylates. Post-synthesis functionalization of these supports was accomplished via electron beam initiated free radical graft polymerization of methacryloyl-substituted NHC precursors. The grafted precursors were converted into the corresponding copper complexes. Cu-loadings were between 1.3 mg . g(-1) and 1.5 mg . g(-1). These supported catalysts were used in selected C = O hydrosilylation and cyanosilylation reactions using a continuous flow setup.