Silver-nanoparticles immobilized initiators and co-initiators
for free radical polymerization (in English)
Polimery 2011, No 4, 281
The specific properties of silver-nanoparticles immobilized initiator and co-initiators for free radical polymerization have been described. The silver-nanoparticles immobilized mercaptobenzophenone (Bp-MPCs) photoinitiates free radical polymerization in both UV and visible regions. The photoinitiation ability of Bp-MPCs in visible region, e.g. in the region in which benzophenone chromophore does not absorb a light, indicates a possible two-photon action even at low incident light intensity. The co-initiation process caused by silver-nanoparticles immobilized mercaptoamino acids (MA-MPCs) is more efficient in comparison to co-initiation observed for corresponding free mercaptoamino acid. This behavior can be attributed the specific interaction of sulfur electrons with surface plasmon electrons that make an electron transfer from mercaptoamino acid to excited electron acceptor more efficient, or to a high concentration of the electron donor in the ligand shell.