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Raman spectra of polymorphs of isotactic polypropylene
Author(s) -
Chalmers J. M.,
Edwards H. G. M.,
Lees J. S.,
Long D. A.,
Mackenzie M. W.,
Willis H. A.
Publication year - 1991
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250221104
Subject(s) - tacticity , raman spectroscopy , monoclinic crystal system , spectral line , materials science , crystallography , antisymmetric relation , polymorphism (computer science) , infrared spectroscopy , analytical chemistry (journal) , chemistry , crystal structure , polymer , organic chemistry , optics , polymerization , physics , biochemistry , astronomy , gene , genotype , composite material , mathematical physics
Raman spectra of the α‐, β‐, γ‐ and smectic polymorphs of isotactic polypropylene were recorded at 298 and 16.5 K. At 298 K the spectra of the polymorphs were very similar except in the antisymmetric CH stretching region. However, at 16 K the Raman spectra of the polymorphs show different features in several wavenumber shift regions. Comparisons are made with infrared spectra recorded at 298 and 100 K and interpretations are made on the basis of non‐equivalent sites in the monoclinic unit cells.