OALib Journal期刊
烷基三甲基溴化铵对羧甲基纤维素钠亚浓缠结溶液流变行为的影响
DOI: 10.11777/j.issn1000-3304.2015.14441
Keywords: 聚电解质 ,表面活性剂 ,亚浓缠结溶液 ,临界聚集浓度 ,逾渗
Abstract:
以羧甲基纤维素钠(NaCMC)-烷基三甲基溴化铵(CnTAB)复合体系为研究对象,在NaCMC亚浓缠结溶液中考察了CnTAB烷基尾链长度对CnTAB临界缔合浓度(cac)及溶液流变行为的影响.采用荧光探针法测得cac值,根据吉布斯自由能定量分析了烷基尾链对胶束缔合行为的影响.稳态流变测试结果表明,较高浓度CnTAB对NaCMC亚浓缠结溶液有强烈的增黏作用.显微观察表明,低浓度CnTAB形成孤立胶束(约5nm),而较高浓度CnTAB则形成胶束复合聚集体(约30nm).扣除胶束电荷中和所致降黏作用后,孤立胶束表现为等效刚性球,NaCMC亚浓缠结溶液的黏度变化符合Einstein方程;相反,胶束在临界浓度以上发生逾渗,形成胶束复合聚集体,进一步形成贯穿于NaCMC分子缠结网路的胶束逾渗网络.首次揭示了复合体系增黏的实质是胶束网络逾渗,而不是由胶束吸附聚电解质链形成物理网络.增黏阶段NaCMC亚浓缠结溶液的黏度变化符合逾渗模型和平均场理论.长程静电相互作用控制胶束缔合与逾渗行为,逾渗临界胶束体积分数随CnTAB尾链长度增加而降低,临界胶束表面间距随CnTAB尾链长度增加而增大.
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