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Fourier transform infrared spectroscopic study of transitions above T g in atactic polystyrene
Author(s) -
Enns John B.,
Boyer R. F.,
Ishida Hatsuo,
Koenig J. L.
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760191016
Subject(s) - polystyrene , infrared , fourier transform infrared spectroscopy , materials science , fourier transform , infrared spectroscopy , analytical chemistry (journal) , polymer , chemistry , optics , physics , organic chemistry , composite material , quantum mechanics
Fourier transform infrared spectroscopy (FT‐IR) has been applied to the study of the molecular mechanisms of transitions of atactic polystyrene above T g . Intensity measurements of vibrational modes as a function of temperature revealed two transitions above T g , which are designated as T u and T ′ u . T ′ u is independent of molecular weight as opposed to the molecular weight dependent T u whose behavior is similar to T g . Infrared measurements are more sensitive to T ′ u than T u . Conformationally sensitive bands show that T ′ u may be related to disruption of local order where there is a negligible barrier to conformational change.