Carboxymethylated nanofibrillated cellulose: effect of monovalent electrolytes on the rheological properties
Carboxymethylated nanofibrillated cellulose: effect of monovalent electrolytes on the rheological properties
复制标题
羧甲基化纳米原纤化纤维素：单价电解质对流变性能的影响
DOI：
10.1007/s10570-014-0394-0
复制
发表时间：
2014
期刊：
影响因子：
5.7
通讯作者：
T. Lindström
中科院分区：
文献类型：
--
作者：
A. Naderi;T. Lindström
摘要通过流变学研究，研究了离子强度对羧甲基化纳米纤化纤维素（NFC）体系性能的影响。结果表明，与在较低离子强度条件下制备的体系相比，含有大量单价电解质的浆料悬浮液的均质化导致NFC体系的产生，其流变响应的幅度较低。进一步表明，在制造后增加NFC悬浮液的离子强度也会导致流变响应的降低。在前一种情况下，流变反应的降低被认为是由于均质过程中分层缺陷的降低引起的，这是由于对电荷的筛选导致的羧甲基化浆的肿胀减少。在后一种情况下（加入电解质后），假定流变响应的降低是由于静电双层的压缩，当电解质存在时带电原纤维之间的静电排斥减弱。
AbstractThe effect of the ionic strength on the properties of a carboxymethylated nanofibrillated cellulose (NFC) system was investigated through rheological studies. It was shown that homogenization of pulp suspensions containing a high amount of a monovalent electrolyte leads to the production of NFC systems displaying a lower magnitude in the rheological response as compared with systems prepared at lower ionic strengths conditions. It was further shown that increasing the ionic strength of NFC suspensions after their manufacturing also results in a lowering of the rheological response. The decreased rheological response in the former case was postulated to be caused by a lowering of the delamination deficiency of the homogenization process, due to decreased swelling of the carboxymethylated pulp, caused by the screening of the charges. In the latter case (post-addition of the electrolyte), the lowering of the rheological response was postulated to be due to the compression of the electrostatic double layer, when the electrostatic repulsion between the charged fibrils diminished in the presence of the electrolyte.