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The presence of head‐to‐head structure in vinylidene chloride sequence in copolymer of vinylidene chloride and vinyl chloride with various feed ratios was demonstrated by the high resolution NMR study. The ratio of head‐to‐head structure in vinylidene chloride sequence was evaluated from measurement of the intensities of NMR spectra. The quantities of local regularity of copolymer were used in the theoretical treatment based on the virtual boundary energy and combinatory method. The experimental results were compared with the theoretical calculations.
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Chûjô et al. (1964) studied this question.
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