Description:
<jats:title>Abstract</jats:title><jats:p>Composition diagrams for the copolymerization of maleic anhydride with methyl methacrylate and with methyl acrylate in ethyl methyl ketone at 50°C were determined using a non‐aqueous potentiometric direct titration method. The data were analysed using non‐linear least squares minimization procedures to test the applicability of terminal, penultimate and complex models for both systems. In both systems, the penultimate model was an improvement over the terminal model, though the penultimate effect was more pronounced in the methyl methacrylate system. No evidence could be found for complex participation in either system.</jats:p>