SynopsisThe heterogenous polymerization of methyl methacrylate in the presence of cuprous oxide was studied. Adsorption measurements of stearic acid from benzene solution onto the surface of CusO were carried out. The specific surface area of cuprous oxide as obtained from the extrapolation to the concentration of monolayer surface coverage in the adsorption isotherm was compared wit.h that evaluated from the BET-equation. Sedimentation volume and sedimentation rate of the variably surface modified CuzO samples were determined. It was found that the surface modification of Cu20 enhances its catalytic effect in the heterogenous polymerization of methyl methacrylate up to monolayer surface coverage. The viscosity average molecular weights A?, of the respective polymers as well as the apparent activation energy of the polymerization process were correlated with the reaction parameters.
The surface unmodified manganiferous ore catalyzed the radical polymerization of methyl methacrylate initiated by sodium bisulphite. An adsorptive surface modification of the ore with stearic acid was carried out to various extents. The influence of the surface coverage on the reaction parameters was investigated. The surface modification effectively retarded the catalytic action of the manganiferous ore and caused a drop of the viscosity average molecular weights of the polymers.
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