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Polarized Raman and infrared studies of single crystals of orthorhombic modification of polyoxymethylene and its linear oligomer: Crystal structures and vibrational assignments
Author(s) -
Kobayashi Masamichi,
Adachi Toshihisa,
Matsumoto Yoshitake,
Morishita Hirofumi,
Takahashi Takehito,
Ute Koichi,
Hatada Koichi
Publication year - 1993
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.1250240811
Subject(s) - polyoxymethylene , orthorhombic crystal system , raman spectroscopy , crystallography , infrared , crystal (programming language) , oligomer , single crystal , infrared spectroscopy , chemistry , materials science , crystal structure , optics , organic chemistry , polymer , programming language , physics , computer science
In order to make vibrational assignments of the metastable orthorhombic modification of polyoxymethylene (o‐POM), polarized Raman and infrared spectra of a single crystal of deca(oxymethylene) diacetate, CH 3 COO(CH 2 O) 10 COCH 3 (POMAc10), a linear oligomer of POM, were measured and compared with previous results obtained using a micron‐sized single crystal of o‐POM. On the basis of the orientation of the o‐POM sublattice in the POMAc10 crystal, assignments of the zone‐centre modes of o‐POM was established and the unit cell orientation in the micron‐sized o‐POM single crystal was decided. The morphology‐dependent frequency shifts of the parallel infrared bands ( B 1 modes) in the POMAc10 crystal, which has a specific morphological structure different from the lamellar crystal of high‐molecular‐weight o‐POM, were investigated on the basis of the transition dipolar coupling theory.