十二烷基硫酸钠与羟乙基纤维素的相互作用.pdf

第23卷第5期
化学研究与应用
Vol
2011年5月
Chemical Research and Application
May,2011
文章编号:1004-1656(2011)05-0587-05
十二烷基硫酸钩与羟乙基纤维素的相互作用
任月萍,徐程程,方云
(江南大学化学与材料工程学院,江苏无锡214122)
摘要:本文用表面张力(y)和电导率(x)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
的水溶性改性物经乙基纤维素(HEC)的相互作用。实验结果表明,SDS-HEC溶液的γ- gcses F曲线和x~css曲
线均呈现双拐点特征,并且y-gs曲线上两个SDS临界浓度值(c1),及(c2),与K~csm曲线上的两个斜率拐
点处SDS浓度(c1)、和(c2),相吻合。用稳态荧光猝灭方法测定了SDS浓度介于(c1),及(c2),之间时SDS
HIEC有序聚集体的束缚胶束聚集数N,发现在8.46-16.92mmol?L1和16.92~25.38mml?L'两个SDS
浓度范围内,N与csmx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),及(2),之间
形成了SDS東缚胶束与HEC大分子构成的有序聚集体结构。
关鍵词:羟乙基纤维素;十二烷基硫酸钠;表面张力;电导率;稳态荧光
中图分类号:0648
文献标识码:A
Interaction of sodium dodecyl sulfate and hydroxyethyl cellulose in aqueous
solution
REN Yue-ping, XU Cheng-cheng, FANG Yu
School of Chemical& Material Engineering, Jiangnan University, Wuxi 214122, China)
Abstract: In this paper, interactions of a typical ionic surfactant sodium dodecyl sul ate(SDS)and h drox ethyl cellulose(HEC)
been investigated by surface tension and specific conductance. It had been found that both the y-lge and K-c curves of SDS-HEC
binary aqueous solutions exhibited double ansit on pints and the critical concentrations(c),and(c), of SDS on y-igc curves
were coincided with() and(2)on c curves respectively. The bound micelles aggregation number(N, )of SDS in SDS-HEC
aggregations had been investigated by steady state fluorescence quenching. In the concentration ranges of SDS between.46-16.92
mmol L and 16.. 38 mmol L M, increased linearly with the increase of SDS concentration in SDS-HEC aqueous solu
tion at a fixed HEC concentration. These experimental results confirmed that SDS and HEC self-assemble into ordered aggregates in
SDS concentration range between(c,), and(c2), in aqueous solutions.
ey words: Hydroxyethyl cellulose; sodium dodecyl sulfate; surface tension; specific conductance; steady state fluorescence
阴离子表面活性剂能够与非离子水溶性大分化工、纳米材料制备和制药工业中。因此,表面活
子发生相互作用,具有单一大分子或者表面活性性剂与大分子之间的相互作用,以及由此导致形
剂所不具有的一些独特和实用的性质,从而使得成的有序聚集体受到越来越多的关注。许多手段
这类体系广泛应用在油气开发、纺印染工业、日用被用于研究阴离子表面活性剂SDS与简单聚合物
收稿日期:2010-10-20;修回日期:201104-1
基金项目: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(CXO8B_118Z)
联系人简介;方云(1957-),男,教授,主要从事胶体与界面化学研究。Email:yunfang@126.com