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1H and 13C NMR spectra were recorded on a JEOL EX-400 spectrometer at a resonance frequency of 400 MHz for proton and 100 MHz for carbon-13. The spectra were observed at room temperature for a 0.40 mol dm−3 solution in DMSO-d6. The chemical shifts were referred to tetramethylsilane (TMS) added as an internal standard for proton and to DMSO-d6 (39.5 ppm) and converted to the TMS scale for carbon-13.
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GPC analysis of polymer 3 was performed with a Tosoh Model 8020 chromatograph equipped with two TSKgel GMHHR-H columns and a refractive index detector. Reproducible chromatograms were obtained when 50 mmol dm−3 DMSO solution of lithium bromide was used as the eluting solvent. The molecular weight reported here is equivalent to that of pullulan.
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The eluting solvent was tetrahydrofuran. The molecular weight was polystyrene-equivalent.
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Shinoda, T., Yoshikawa, M. & Nishiwaki, T. Preparation of a Novel 1:1 Copolymer of 4-Hydroxystyrene and Sulfur Dioxide. Polym J 28, 282–283 (1996). https://doi.org/10.1295/polymj.28.282
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DOI: https://doi.org/10.1295/polymj.28.282
