十二烷基硫酸钠与羟乙基纤维素的相互作用  

Interaction of sodium dodecyl sulfate and hydroxyethyl cellulose in aqueous solution

作　　者：任月萍 徐程程 方云 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《化学研究与应用》2011年第5期587-591,共5页Chemical Research and Application

基　　金：国家自然科学基金资助项目(20871059);江苏省研究生创新计划资助项目(CX08B_118Z)

摘　　要：本文用表面张力（γ）和电导率（κ）方法研究了阴离子表面活性剂十二烷基硫酸钠（SDS）与天然纤维素的水溶性改性物羟乙基纤维素（HEC）的相互作用。实验结果表明,SDS-HEC溶液的γ-lgcSDS曲线和κ~cSDS曲线均呈现双拐点特征,并且γ-lgcSDS曲线上两个SDS临界浓度值（c1）γ及（c2）γ与κ~cSDS曲线上的两个斜率拐点处SDS浓度（c1）κ和（c2）κ相吻合。用稳态荧光猝灭方法测定了SDS浓度介于（c1）γ及（c2）γ之间时SDS-HEC有序聚集体的束缚胶束聚集数Nb,发现在8.46~16.92 mmol.L-1和16.92~25.38 mmol.L-1两个SDS浓度范围内,Nb与cSDS呈现良好的线性关系。这些实验结果表明水溶液中HEC与SDS在（c1）γ及（c2）γ之间形成了SDS束缚胶束与HEC大分子构成的有序聚集体结构。In this paper,interactions of a typical ionic surfactant sodium dodecyl sulfate（SDS）and hydroxyethyl cellulose（HEC）been investigated by surface tension and specific conductance.It had been found that both the γ-lgc and κ~c curves of SDS-HEC binary aqueous solutions exhibited double transition points and the critical concentrations（c1）γ and（c2）γ of SDS on γ-lgc curves were coincided with（c1）κ and（c2）κ on κ~c curves respectively.The bound micelles aggregation number（Nb）of SDS in SDS-HEC aggregations had been investigated by steady state fluorescence quenching.In the concentration ranges of SDS between 8.46~16.92 mmol·L-1 and 16.92~25.38 mmol·L-1,Nb increased linearly with the increase of SDS concentration in SDS-HEC aqueous solution at a fixed HEC concentration.These experimental results confirmed that SDS and HEC self-assemble into ordered aggregates in SDS concentration range between（c1）γ and（c2）γ in aqueous solutions.

关 键 词：羟乙基纤维素 十二烷基硫酸钠 表面张力 电导率 稳态荧光 

分 类 号：O648.1[理学—物理化学]