Swelling behavior of carboxymethylcellulose hydrogels in relation to cross-linking, pH, and charge density

被引:234
作者
Barbucci, R
Magnani, A
Consumi, M
机构
[1] Univ Siena, CRISMA, I-53100 Siena, Italy
[2] Univ Siena, Dept Chem & Biosyst Sci & Technol, I-53100 Siena, Italy
关键词
D O I
10.1021/ma0007029
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Hydrogels of carboxymethylcellulose (CMC) with 2.5%, 25%, 50%, and 100% cross-linking were prepared. Cross-linking and stoichiometry was controlled by appropriate addition of CMPJ and determined by potentiometric titration. The cross-linked polymer was then sulfated using a sulfur trioxide-pyridine complex (SO3-Py) in a heterogeneous mixture. Water uptake of the gels was studied in relation to cross-linking, pH, and sulfation. FT-IR spectra of the gels were recorded at different pHs to evidence the hydrogen bonds. Hydrogen bonds formation between the chains may explain the correlation found between water uptake properties and the chemical composition of the gels.
引用
收藏
页码:7475 / 7480
页数:6
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