Abstract
The conformation and the sudden tightening which Takayanagi has suggested, for the fold loop of Trans-1,4-polybutadiene single crystals and cast films have been discussed from the studies on the assignment and the resolution of the IR spectrum near 1450 cm−1. Four conformation sensitive methylene scissoring bands were assigned by the rotational state of the CH2—CH2 rotational axis and by crystallinity or noncrystallinity. From two parameters determined experimentally and the assumption of a Lorentzian representation for each band, the spectrum was resolved into four bands, and the ratios between band intensities were obtained as a function of annealing temperature. The average conformation in the noncrystalline part of the as-grown samples was considered nearly the same to that of the random coil. By annealing above 60°C, the ratios were suddenly changed. It was concluded that the average conformation in the noncrystalline part became gauche-rich. Under reasonable assumptions, the numbers of trans mers N(T) and gauche mers N(G) per fold of the single crystal were estimated; N(T)=2—3, N(G)=3—2 for the as-grown sample and N(T)=0—1, N(G)=3—2 for the 80°C annealed sample.
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Oyama, To., Shiokawa, K. & Murata, Y. Conformation of the Fold of Trans-1,4-PoIybutadiene. Polym J 6, 549–553 (1974). https://doi.org/10.1295/polymj.6.549
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DOI: https://doi.org/10.1295/polymj.6.549