Abstract
A novel cellulose-based polyampholyte derivative, carboxylethyl quaternized cellulose (CEQC), was homogeneously synthesized by introducing positively charged quaternary ammonium groups and negatively charged carboxyl groups to the backbone of cellulose. The structure and dilute solution properties of CEQCs were characterized with elemental analysis, FTIR, NMR, viscometer, light scattering and zeta-potential measurement. The nitrogen content and total degree of substituent of acylamino and carboxyl groups increased with an increase of the molar ratio of acrylamide to the anhydroglucose unit of quaternized cellulose (QC). The salt-resistance of CEQC was improved remarkably by introducing opposite charged carboxyl to the QC chains. The intrinsic viscosity of the prepared polyampholytes was found to be very sensitive to the pH of the solutions. CEQC-1, the sample with relative low content of carboxyl groups, behaved as a classical cationic polyelectrolyte. However, CEQC-2 and CEQC-3, the samples with higher content of carboxyl groups, displayed typical polyampholyte behavior, and the isoelectric points (IEP) were determined to be 5.0 and 3.8 respectively. This work provided a facile method for the synthesis of novel cellulose-based polyampholytes with different IEP.
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This work was financially supported by National Natural Science Foundation of China (50973085), Program for New Century Excellent Talents in University (NCET-11-0415), National Basic Research Program of China (973 Program, 2010CB732203) and Fundamental Research Funds for the Central Universities.
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You, J., Hu, H. & Zhou, J. Synthesis, structure and solution properties of the novel polyampholytes based on cellulose. Cellulose 20, 1175–1185 (2013). https://doi.org/10.1007/s10570-013-9891-9
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DOI: https://doi.org/10.1007/s10570-013-9891-9