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Spectroscopic study of the modification of cellulose with polyethylenimines
Author(s) -
De La Orden M. U.,
Matías M. C.,
Martínez Urreaga J.
Publication year - 2004
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.20236
Subject(s) - amine gas treating , cellulose , protonation , aqueous solution , fourier transform infrared spectroscopy , diffuse reflectance infrared fourier transform , chemistry , ultraviolet visible spectroscopy , polymer chemistry , nuclear chemistry , spectroscopy , organic chemistry , chemical engineering , photocatalysis , catalysis , ion , engineering , physics , quantum mechanics
The reaction of cellulose with polyethylenimines (PEIs) was studied using diffuse reflectance ultraviolet–visible (UV–vis) spectroscopy, diffuse reflectance FTIR spectroscopy, and standard colorimetry. PEIs were applied from aqueous solutions at the natural pH (pH ∼ 11) and at pH = 6. The obtained materials were exposed to different thermal treatments in air. Celluloses treated at pH = 11 suffer the reversible formation of amine bicarbonate salts. This reaction was not observed in celluloses treated at pH = 6 because of the protonation of the amine groups. In all treated celluloses, the PEI amine groups reacted with cellulose carbonyl groups at moderate temperatures to form Schiff bases, which were responsible for the yellowing of the material. At higher temperatures other oxidation products were detected in the UV–vis and infrared spectra. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2196–2202, 2004