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- W2091149846 abstract "The variation, as a function of temperatute, of the carbon-13 spin-lattice relaxation time of individual carbons of poly(2-vinylpyridine) in solution was measured and the molecular motion was analysed quantitatively. The motion of the polymer can be characterized by three contributions: namely, a segmental motion and two kinds of internal rotation of the pyridine ring. The temperature dependence of the rate of the internal rotation revealed a transitional change at about 25°C, while that of the segmental motion changed linearly. It is suggested that the internal rotation of the pyridine ring is interrupted by steric hindrance, which is probably due to a repulsive interaction between the hydrogen atoms in the pyridine ring and the methine group and by a formation of hydrogen bonding at lower temperatures. Above the transition temperature, the thermally activated motion overcomes such hindrances and the pyridine ring rotates more freely." @default.
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- W2091149846 date "1977-03-01" @default.
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- W2091149846 title "A Study of the Thermal Transition of Poly(2-vinylpyridine) in Solution by Carbon-13 NMR" @default.
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- W2091149846 doi "https://doi.org/10.1295/polymj.9.127" @default.
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