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Application of the Low Frequency Raman Spectroscopy for Studying Ultra‐High Molecular Weight Polyethylenes
Author(s) -
Pakhomov Pavel,
Khizhnyak Svetlana,
Galitsyn Vladimir,
Rogova Ekaterina,
Hartmann Brigitta,
Tshmel Alexandre
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000137
Subject(s) - raman spectroscopy , crystallinity , polyethylene , materials science , polymer , nucleation , low frequency , range (aeronautics) , macromolecule , analytical chemistry (journal) , chemical physics , polymer chemistry , composite material , optics , chemistry , physics , organic chemistry , biochemistry , astronomy
In the frequency range below ∼150 cm −1 , the longitudinal acoustic modes (LAM) localized along straight chain segments (SCS) of macromolecules emerge in the Raman spectra of linear semicrystalline polymers. The LAM frequency is inversely proportional to the SCS length; therefore, the LAM band contour reflects the SCS length distribution in a sample. The opportunities given one by the low‐frequency Raman spectroscopy for studying the ordered structures in polyethylene are demonstrated and discussed. The illustrating material consists of both previously published and original data on nucleation and transformation of the ensemble of SCS in powder‐like, gelled, and drawn ultra‐high molecular weight polyethylene.