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Infrared spectra evaluation of syndiotactic polystyrene by dynamic infrared linear dichroism spectra and static difference spectra
Author(s) -
Wang Yanxiang,
Lehmann Stephan
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19981201)199:12<2797::aid-macp2797>3.0.co;2-j
Subject(s) - polystyrene , infrared spectroscopy , spectral line , tacticity , linear dichroism , chemistry , infrared , dichroism , molecular physics , analytical chemistry (journal) , nuclear magnetic resonance , materials science , crystallography , circular dichroism , optics , polymer , physics , organic chemistry , astronomy , polymerization
Uniaxially drawn syndiotactic polystyrene (sPS) in various modifications has been analyzed by static difference polarization spectra and DIRLD (dynamic infrared linear dichroism) spectra during mechanical stretching. Both, derivative bipolar bands and monopolar bands, are observed as a hint to submolecular changes induced by the applied external strain. The lineshape features in the dynamic in‐phase spectra are described on the basis of frequency shifts and absorption amplitude variations during the stretching cycle. The conformationally sensitive vibrational modes are most sensitive to the external perturbation. The different responses of the conformationally insensitive vibrational modes to the external perturbation are discussed.