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Relation of certain infrared bands to cellulose crystallinity and crystal lattice type. Part II. A new infrared ratio for estimation of crystallinity in celluloses I and II
Author(s) -
Nelson Mary L.,
O'Connor Robert T.
Publication year - 1964
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.1964.070080323
Subject(s) - crystallinity , infrared , sorption , materials science , infrared spectroscopy , analytical chemistry (journal) , cellulose , mineralogy , composite material , chemistry , optics , organic chemistry , physics , adsorption
A new infrared ratio, α 1372 cm. −1 /α 2900 cm. −1 , is proposed for measuring crystallinity in cellulosic materials. The advantage of this ratio over others which have been used is that it can be applied to both celluloses I and II and, therefore, to samples containing a mixed lattice. Two series of samples, encompassing a wide range of crystallinity, were prepared from highly crystalline celluloses I and II. The infrared ratios of these samples were compared with crystallinity values from x‐ray diffractograms and density measurements, and with accessibility data from moisture sorption. It was shown that the new infrared ratio ranks samples of both lattice types, as well as partly mercerized cottons, in the same order as do x‐ray, density, and moisture sorption data. The correlation of the new infrared ratio with accessibility, derived from moisture regain, is better than with crystallinities from either x‐ray or density measurements. Reasons for this are suggested.