Summary
High-resolution 1H NMR spectra (1H HR-NMR) of solutions of isotactic (i) and syndiotactic (s) poly(methyl methacrylate) (PMMA) in toluene-d8 were measured in the concentration range 0.2 to 10% w/v; for solutions of s-PMMA (10% w/v), 1H NMR spectra with magic angle rotation (MAR-NMR) at various temperatures and 13C NMR spectra with strong proton decoupling were also measured. It was found that even in very dilute solutions of s-PMMA in toluene-d8 a considerable portion (76%) of polymer segments are associated: association is of intramolecular origin and is due to interaction of long syndiotactic sequences. Prom NMR spectra the motion of associated segments appears as isotropic with and effective correlation frequency 106 – 107 Hz. A globular structure of the associates of s-PMMA is proposed.
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Spěváček, J., Schneider, B. NMR-study of structure and dynamics of associates of syndiotactic poly(methyl methacrylate) in toluene. Polymer Bulletin 2, 227–233 (1980). https://doi.org/10.1007/BF00254590
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DOI: https://doi.org/10.1007/BF00254590