Abstract
The electro-initiated polymerization of methylmethacrylate (MMA) in the presence of HNO3 [1] has been re-investigated in more detail. It has been ascertained that the marked post-polymerization effect is not due to the presence of HNO3. Indeed, the number of radicals still living at the end of the electrolysis is the most important factor. Oligomers soluble in CH3OH were formed in this polymerization, their amount depending on both the current density and carbon anode porosity. The polymer tends to accumulate near the electrode forming a barrier which hinders the diffusion of the active species. The gel effect was characterized as a function of electrolysis time and solution viscosity. The¯Mw/¯Mn ratio is equal to 1·9, indicating a low dispersity of the molecular weights. This result, together with the previous results of melt-flow index measurements, indicates that the polymer so obtained may be industrially processed.
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