期刊
CARBOHYDRATE RESEARCH
卷 344, 期 11, 页码 1332-1339出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2009.04.023
关键词
Cellulose; Polyelectrolytes; Solution properties; Viscosity; Rheology
资金
- National Natural Science Foundation of China [20204011, 20674057]
- National High Technology Research and Development Program of China [2004AA649250]
A novel cellulose-based polyelectrolyte (AM-C) containing acylamino (DS=0.625) and carboxyl (DS=0.148) groups was homogeneously synthesized from cellulose with acrylamide in NaOH/urea aqueous solutions. Solution properties of AM-C in aqueous solutions were investigated by laser light scattering, rheometry, and viscometry. The results indicated that AM-C could form large aggregates spontaneously in water with or without the addition of salts by the strong hydrogen bonds and electrostatic interaction between acylamino and carboxyl groups. Steady-shear flow study showed a Newtonian behavior of the solutions in the dilute regime while a shear-thinning behavior as the concentration increases. The critical concentration (c,) for transition from dilute to concentrated solution was determined to be 0,7 wt%. Aqueous solutions of AM-C displayed good thermo-stability, reversible liquid-like characters attributing to the chemical modification. The derivation from Cox-Merz rule at relatively low concentration was related to the co-existence of single chain and large aggregates of AM-C in dilute regime. As the polymer concentration increased, the AM-C system was transformed into a homogeneous entanglement structure, resulting in the disappearance of deviations from the Cox-Merz rule. (C) 2009 Elsevier Ltd. All rights reserved.
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