Abstract
The 13C–{1H} high-resolution nuclear magnetic resonance spectra were measured for poly(methyl methacrylate). The spectra clearly split corresponding to dyad, triad, tetrad, and pentad placements. The relative intensity of every peak for the spectrum of a polymer prepared with 9-fluorenyllithium in tetrahydrofuran/toluene (80/20) at −23°C was reasonably interpreted by the Bernoulli trial model.The nuclear Overhauser effect due to total proton decoupling did not affect the relative intensities among the peaks assigned to chemically equivalent carbons except for the difference in stereochemical configuration. This was confirmed by comparison between the relative intensities of the above-mentioned polymer and by comparison between those of 13C–{1H} and of 1H resonance of the polymer.The microtacticity determined by 13C–{1H} spectra of a polymer prepared with 9-fluorenyllithium in tetrahydrofuran/toluene (4/96) was fairly well interpreted by the stereoblend model, but by neither first-order nor second-order Markovian model.
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Inoue, Y., Nishioka, A. & Chûjô, R. 13C–{1H} Nuclear Magnetic Resonance Spectroscopy of Poly(methyl methacrylate). Polym J 2, 535–540 (1971). https://doi.org/10.1295/polymj.2.535
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DOI: https://doi.org/10.1295/polymj.2.535