The hindered internal rotation of amide groups of polyacrylamide of low molecular weights.
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概要
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Polyacrylamides of low molecular weights (average degrees of polymerization(‾<I>DP</I>) : 7.2, 18.3, 21.3, and 45.4) were prepared by radical polymerization, and their PMR spectra were observed over the temperature range of 30–90 °C. From the temperature dependence of the PMR spectra, the values of the energy barrier to the internal rotation about C–N bonds were determined by means of a total line-shape analysis. The energy barriers for the polymers above ‾<I>DP</I> : 18.3 were 10.6 kcal/mol, while those for the polymer of ‾<I>DP</I> : 7.2 were 9.2 kcal/mol. These results were interpreted in terms of the local environment around the amide groups. The intramolecular hydrogen bonding was also investigated.
著者
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Imamura Yoshio
Department of Applied Chemistry, Faculty of Science, Science University of Tokyo
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Hirai Yoshiyuki
Department of Chemistry, Faculty of Science, Science University of Tokyo
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Yukawa Mitsuyoshi
Department of Chemistry, Faculty of Science, Science University of Tokyo
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