Title of article :
Effect of carboxymethylation conditions on the water-binding capacity of chitosan-based superabsorbents Original Research Article
Author/Authors :
Hosein Bidgoli، نويسنده , , Akram Zamani، نويسنده , , Mohammad J. Taherzadeh، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2010
Pages :
7
From page :
2683
To page :
2689
Abstract :
A superabsorbent polymer (SAP) from chitosan was provided via carboxymethylation of chitosan, followed by cross-linking with glutaraldehyde and freeze-drying. This work was focused on an investigation of the effects of monochloroacetic acid (MCAA), sodium hydroxide, and reaction time on preparation of carboxymethyl chitosan (CMCS). The CMCS products were characterized using FTIR spectroscopy, and their degrees of substitution (DS) were measured using conductimetry and FTIR analysis. The highest DS value was obtained when the carboxymethylation reaction was carried out using 1.75 g MCAA and 1.75 g NaOH per g of chitosan in 4 h. The water solubilities of the CMCS products at various pHs were also evaluated, and the results indicated a significant impact of the reaction parameters on the solubility of CMCS. The CMCSs with the highest DS value resulted in SAPs having the highest water-binding capacity (WBC). The WBC of the best SAP measured after 10 min exposure in distilled water, 0.9% NaCl solution, synthetic urine, and artificial blood was 104, 33, 30, and 57 g/g, respectively. The WBC of this SAP at pH 2–9 passed a maximum at pH 6.
Keywords :
Carboxymethyl chitosan , Superabsorbent polymer , Degree of substitution , Water-binding capacity
Journal title :
Carbohydrate Research
Serial Year :
2010
Journal title :
Carbohydrate Research
Record number :
966798
Link To Document :
بازگشت