Abstract
High-resolution NMR spectra of chlorinated polyethylenes with various chlorine contents were measured on o-dichlorobenzene solutions at ca. 160°C. The chemical shifts for the resonances associated with the distribution of chlorine atoms along the polymer chain were resolved by the triad or pentad units, and content of the chemical units was quantitatively obtained.Chemical units containing geminal dichloride were observed when chlorine content approached ca. 40 wt %.The structure of chlorinated polyethylenes in the region of chlorine content below 40 wt % is characteristic of the statistically random distribution of chlorine atoms along the polymer chain. Various methylenes and methynes in various proton environments were observed, but chemical units such as vinylidene chloride sequences were not observed in the chain.It was found that a chlorination condition slightly affected the chlorine distribution, namely the solution chlorination increased vicinal-dichloride units rather than geminal-dichloride units. However, the molecular weight of the parent polymer did not affect the chlorine distribution of chlorinated polyethylenes.The sequence-length distribution of methylenes was also obtained and the contents of longer methylene sequences (–(CH2)n–, n≥5) were computed using the results of Frensdorff and Ekiner’s theoretical treatment.
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Saito, T., Matsumura, Y. & Hayashi, S. High-Resolution NMR Study of Chlorinated Polyethylenes. Polym J 1, 639–655 (1970). https://doi.org/10.1295/polymj.1.639
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DOI: https://doi.org/10.1295/polymj.1.639