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Structural features of cellulosic change in alkali‐treated jute stick: An infrared absorption study
Author(s) -
Reddy S. S.
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.1990.070410936
Subject(s) - alkali metal , hydrogen bond , absorption (acoustics) , cellulose , infrared , materials science , infrared spectroscopy , swelling , absorption band , chemistry , polymer chemistry , molecule , organic chemistry , composite material , physics , optics
The cellulosic change has been discussed in terms of absorption ratio of certain infrared bands. It is shown that the absorption of O—H and C—H stretching frequencies decreases up to 25% alkali treatment and the absorption of β‐glucosidic band increases with increasing alkali strength in swelling. The anomalous behavior in the absorption of these bands at 18% alkali treatment might be due to partial mercerization. A new type of hydrogen bonding is proposed where C 6 hydroxyl groups are involved in a bifurcated six‐membered hydrogen bonding system giving more crystalline nature to mixed lattice of cellulose. The O 2 hydroxyl proton forms hydrogen bond with O 3 of the same unit and with O' 2 H of its antiparallel chain. It is also noted that the presence of lignin has no significant effect on cellulosic transition.