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The factor group splitting phenomenon: a vibrational spectroscopy approach to assess polymer crystallinity and crystalline density
Author(s) -
Lagaron JoseMaria
Publication year - 2002
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 - 10.1002/1521-3900(200208)184:1<19::aid-masy19>3.0.co;2-x
Subject(s) - crystallinity , polymer , materials science , raman spectroscopy , chemical physics , spectroscopy , crystallography , chemistry , optics , composite material , physics , quantum mechanics
This paper gathers a number of relevant recent findings where Raman spectroscopy has been successfully applied by the author and coworkers to gain a unique structural picture about the crystalline phase present in isotropic and cold‐drawn polyethylenes and in a range of aliphatic polyketone materials. In these semicrystalline polymers a relatively well‐known spectroscopic phenomenon called factor group splitting (or correlation field splitting) is thought to occur. By careful analysis of the behaviour of this splitting phenomenon, chiefly in the ‐CH 2 ‐ bending range of the spectrum and in terms of alterations in band intensity and position, a valid approach to asses crystallinity content and morphology, crystalline polymorphism, and crystalline density is displayed. The potential of this spectroscopic phenomenon to yield information about the crystalline phase present in these polymers can therefore be regarded as analogous to that gained by wide‐angle X‐ray scattering.