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Carboxymethylation of cellulosic material (average degree of polymerization 2600) isolated from cotton ( Gossypium ) linters with respect to degree of substitution and rheological behavior
Author(s) -
Khullar Ritu,
Varshney V. K.,
Naithani Sanjay,
Heinze Thomas,
Soni P. L.
Publication year - 2005
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.21645
Subject(s) - degree of polymerization , carboxymethyl cellulose , cellulose , depolymerization , sodium hydroxide , polymer chemistry , polymerization , rheology , chemistry , monomer , polyelectrolyte , polymer , shear thinning , intrinsic viscosity , materials science , organic chemistry , sodium , composite material
Carboxymethylation of cellulosic material (average degree of polymerization 2600) containing 76.5% cellulose and 23.6% xylose isolated from cotton ( Gossypium ) linters was studied under varying reaction conditions with respect to maximum degree of substitution (DS). The influence of reaction conditions on the apparent viscosity of the prepared derivatives was also studied. The conditions optimized were sodium hydroxide concentration 3.75 M , monochloroacetic acid concentration 2.05 mol/AGU, carboxymethylation time 3.5 h, and temperature 55°C, to yield carboxymethyl cellulose of DS 0.77. Rheological studies of 1 and 2% solutions of the optimized product revealed their non‐Newtonian pseudoplastic behavior. Repeating units of the optimized product were also determined by HPLC after complete depolymerization of the polymer. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1477–1482, 2005