Analysis of organometallics dispersed polymer composite irradiated with oxygen ions

摘要

Thin films of polymethyl methacrylate (PMMA) were synthesized. Ferric oxalate was dispersed in PMMA films. These films were irradiated with 80 MeV O~(6+) ions at a fluence of 1 X 10~(11) ions/cm~2. The radiation induced changes in electrical conductivity, Mossbauer parameter, microhardness and surface roughness were investigated. It is observed that hardness and electrical conductivity of the film increases with the concentration of dispersed ferric oxalate and also with the fluence. It indicates that ion beam irradiation promotes (i) the metal to polymer bonding and (ii) convert the polymeric structure into hydrogen depleted carbon network. Thus irradiation makes the polymer harder and more conductive. Before irradiation, no Mossbauer absorption was observed. The irradiated sample showed Mossbauer absorption, which seems to indicate that there is significant interaction between the metal ion and polymer matrix. Atomic force microscopy shows that the average roughness (R_a) of the irradiated film is lower than the unirradiated one.