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Title
Functionalization of cellulose: Synthesis of water-soluble cationic cellulose derivative
Authors
JOLANTA LIESIENE and JURGITA KAZLAUSKE
Received
October 19, 2012
Published
Volume 47 Issue 7-8 July-August
Keywords
cellulose derivatives, aminocellulose, cationic polyelectrolytes, water-soluble polymers, cationic cellulose
derivatives
Abstract
One of the trends of modern cellulose chemistry is the functionalization of known cellulose derivatives in order to
expand their application area. In this work, water-soluble cationic cellulose derivatives containing up to 4% coupled
nitrogen were obtained by the amination of hydroxyethylcellulose (HEC) with two different etherification agents,
diethylepoxypropylamine (DEEPA) and (2-chlorethyl) diethylamine hydrochloride (DEAE). The influence of the
composition of the reaction mixture on the degree of substitution was investigated by using mathematical planning of
the experiments and was described by regression equations. The effect of the etherification agent on the composition of
cationic groups of the obtained derivatives was examined. It was found that the HEC reaction with DEEPA resulted in
a monofunctional cationic polyelectrolyte containing tertiary amino groups, which could be assigned to cationic groups
of intermediate basicity (pKa approx. 8.2). On the contrary, the amination of HEC with DEAE gave polyfunctional
derivatives containing a mixture of weakly and intermediately basic amino groups with pKa
6.0-6.2 and 8.2-8.6, respectively. The synthesized derivatives are soluble in polar aprotic solvents, as well as in water, and the solutions
possess high stability at elevated temperature and a high concentration of salts.
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