Molecular Vibrations and Infrared Absorption of the Helical Form of Syndiotactic Polypropylene
- 1 December 1965
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 43 (11) , 4030-4040
- https://doi.org/10.1063/1.1696637
Abstract
The molecular vibrations of the helical conformation (TTGG form) of syndiotactic polypropylene were treated on the basis of the intramolecular force field as transferred from that of isotactic polypropylene. The frequencies calculated for infrared‐active vibrations (B 1, B 2, and B 3 species) agreed closely with the observed values (rms deviation as small as 1.1%). The potential‐energy distributions and atomic displacements (LX matrices) were also calculated for elucidating the nature of infrared bands. With reference to the calculated atomic displacements, the ν a and ν b vibrations of the TTGG form were also identified.Keywords
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