Determination of Compositional,Configurational Sequences in High Conversion Methyl Methacrylate-Methacrylic Acid Emulsion Copolymers Using a Rapid and Selective Counting Procedure |
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| Authors: | Mare-France Llauro Roger Spitz Christian Pichot S Nishida |
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| Institution: | 1. CNRS Laboratoire des Materiaux Organiques , BP 24-69390, Vernaison, France;2. Emulsion Polymer Institute Lehigh University , Bethlehem, Pennsylvania;3. Japan Synthetic Rubber Co. , Yokkaichi, Mie, Japan |
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| Abstract: | High conversion methyl methacrylate (MMA)-methacrylic acid (MA) copolymers prepared by two different emulsion polymerization processes were characterized in terms of composition and sequence distribution by 1H- and 13C-NMR, taking into account the conversion effect. A rapid and selective counting procedure for calculating the compositional configurational pentads (512 values) in these copolymers is described. From this counting procedure and using the Klesper's assignment of the 18 peaks observed in the 13C-NMR carbonyl resonance spectrum of the copolymers, a relatively good agreement was found between the calculated and experimental fractions of each peak intensity. Moreover, this study allows differences in compositional homogeneity to be characterized as a function of the nature of the emulsion polymerization process. |
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