Characterization of intramolecular microstructure of styrene-methyl methacrylate copolymers: new 1H NMR assignments supported by 2D-NOESY NMR

A.M. Aerdts, J.W. Haan, de, A.L. German, G.P.M. Velden, van der

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Abstract

The methoxy 1H NMR signals in the 8 2.10-3.70 region for statistical styrene-methyl methacrylate copolymers have been reassigned for several methyl methacrylate centered triad/pentad resonances. Former literature assignments for statistical copolymers were inconsistent with experimental results. New peak assignments are completely based on pentad sequence distributions. Supporting evidence for these reassignments is 2-fold: First, comparison of theoretically calculated and experimentally observed peak areas, and the use of various independent procedures for the determination of the coisotacticity parameter u, yields consistent results (u = 0.44). Second, 2D-NOESY (Nuclear Overhauser effect spectroscopy) NMR experiments were carried out for alternating as well as for statistical copolymers. The results supported the proposed reassignments.
Original languageEnglish
Pages (from-to)1473-1479
JournalMacromolecules
Volume24
Issue number7
DOIs
Publication statusPublished - 1991

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