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Authors
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Komber, H. ; Steinert, V. ; Voit, B.
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Title
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1H, 13C and 31P NMR study on poly(vinylphosphonic acid) and its dimethylester
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Date
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25.03.2008
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Number
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15630
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Abstract
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The microstructure of poly(vinylphosphonic acid) (PVPA) and poly(vinyl dimethyl phosphonate) (PVDMP) prepared by free radical polymerization was studied by a combination of one- and two-dimensional NMR spectra. Whereas 13C and 31P NMR spectra give less stereochemical information a signal split into diad, triad, and, at best, m-centered tetrad sequences for the methylene protons of PDMVP could be observed in the 1H NMR spectra. For PVPA our assignments differ from those previously published in the literature. The spectra of both polymers were complicated by the presence of head-to-head regioirregular structures with up to ~17% for PVPA. For the regioregular part a mainly atactic structure was determined for PVPA, whereas PVDMP has an increased content of isotactic sequences. The dependency of 1H and 31P signals of PVPA on the degree of neutralization is presented.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 41 (2008) 2119-2125
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DOI
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https://doi.org/10.1021/ma702662q
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Tags
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to-head addition radical polymerization phosphonic acid dissociation behavior poly(acrylic acid) maleic-anhydride spectra temperature assignment titration
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