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Vibrational Study of the Chain Conformation of the Liquid n‐Paraffins and Molten Polyethylene
1.Q. N. Sheppard, Advan. Spectry. 1, 288 (1959).
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10.Either taken from Ref. 2 or from the spectra shown in Figs. 22–24. Observed spectra of the liquid n‐paraffins were measured in this laboratory.
11.R. G. Snyder and J. H. Schachtschneider, Spectrochim. Acta 21, 169 (1965).
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14.S. Krimm, Fortschr. Hochpolymer. Forsch. 2, 51 (1960).
15.We have used calculated frequencies rather than observed because the latter suffer small displacements due to crystal‐field effects. The calculated values are taken from Ref. 3 and are slightly higher than what would be obtained using the valence force field reported here.
16.In the case where a sequence of trans methylene groups extends to the end of a molecule, the number of “effective” methylene groups is increased by the participation of the methyl group in the motion. The methyl group in undergoing a rocking motion itself has the effect of adding about one‐half of one methylene group to the sequence (Ref. 3).
17.R. G. Snyder, J. Chem. Phys. 42, 1744 (1965).
18.Region of maximum amplitude of the end methylenes is estimated from the phase‐frequency curve for methylene wagging (Ref. 2); the maximum occurs near
19.S. Mizushima, Structure of Molecules and Internal Rotation (Academic Press Inc., New York, 1954), Pt. 1, Chap. 5.
20.R. N. Jones, Spectrochim. Acta 9, 235 (1957).
21.A small inflection at on some of the curves is due to a change in the grating order at that position.
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