ABSTRACT:The surface of UV-cured films of poly(ethylene glycol) diacrylate (PEGAc)/tetrahydrofurfuryl acrylate (THFAc) (weight ratio 100/0, 90/10, and 80/20) was metallized by the reduction of polymer-incorporated cobalt chloride with aqueous sodium borohydride at 20°C. The electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy measurement revealed that the cobalt ion, which was homogeneously distributed in the inner part of the film before reduction, migrated to both sides of the film, and then reduced to pure metal by the reduction treatment. The surface resistance of the UV-cured PEGAc/THFAc film increased with increasing THFAc content. Especially, the trend was prominent at the glass side of the metallized films.The glass transition temperature of the cured resin measured by dynamic viscoelastic analysis slightly rose with an increase of THFAc content. The EPMA map of cobalt and carbon in the depth direction of the metallized film showed that the cobalt layer, generated at the glass side of the film with a higher THFAc content, contains more polymer component, in agreement with the order of surface resistance. The X-ray diffraction analysis of the reduced films revealed that the degree of crystallinity of the generated cobalt was low.
ABSTRACT:The surface of the blend films of poly(ethylene glycol) diglycidyl ether (PEG-E) and bisphenol A diglycidyl ether (BPA-E) cured with 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride at 200°C for 5 h was metallized by the reduction of polymerincorporated cobalt acetate with aqueous sodium borohydride at 20 -50°C. Although the cured films of PEG-E/ BPA-E, weight ratio 100/0 -80/20, were successfully metallized, the blend ratio 60/40 did not afford a metallized film by this reduction method. The glass transition temperature (T g ) of the cured resin measured by dynamic viscoelastic analysis rose with an increase of BPA-E content. The difficulty of surface metallization in the case of blend ratio 60/40 is related to the hindrance of migration of cobalt ion due to the restriction of molecular chain motion. Electron probe microanalysis and X-ray photoelectron spectroscopy measurement revealed that the cobalt ion that was homogeneously distributed in the inner part of the film before reduction migrated to both sides of the film and then was reduced to pure metal by the reduction treatment. The X-ray diffraction analysis of the reduced films revealed that the generated cobalt was almost amorphous.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.