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High‐pressure FTIR studies of gas–polymer interactions
Author(s) -
Fried J. R.,
Li W.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070410521
Subject(s) - fourier transform infrared spectroscopy , polymer , dissolution , cellulose acetate , carbon dioxide , dipole , analytical chemistry (journal) , methacrylate , materials science , methyl methacrylate , polymer chemistry , chemistry , cellulose , chemical engineering , organic chemistry , composite material , monomer , engineering
FTIR spectra of cellulose acetate (CA) and poly(methyl methacrylate) (PMMA) at 35°C have been obtained as a function of carbon dioxide pressure at pressures up to 55 atm in a specially designed FTIR cell. Results indicate that the carbonyl stretching vibrations for CA (1752 cm −1 ) and PMMA (1731 cm −1 ) shift to slightly higher wave numbers with increasing pressure. The small shifts suggest dipole–dipole interactions between CO 2 and the carbonyl group. In both cases, the shift appears to be linear with pressure. This linearity is interpreted in the framework of the dualmode theory to suggest that gas–polymer interactions occur in the Henry's law dissolution mode.