Interaction of Pyrene-Labeled Poly(ethylene imine) with Sodium Dodecyl Sulfate in Aqueous Solution
Interaction of Pyrene-Labeled Poly(ethylene imine) with Sodium Dodecyl Sulfate in Aqueous Solution
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DOI：
10.1021/ma980931j
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发表时间：
1999-01
期刊：
影响因子：
5.5
通讯作者：
M. Winnik;S. Bystryak;J. Siddiqui
中科院分区：
文献类型：
--
作者：
M. Winnik;S. Bystryak;J. Siddiqui
The interaction between pyrene-labeled poly(ethylene imine) (PEI−Py), a hyperbranched polymer, and the anionic surfactant sodium dodecyl sulfate (SDS) in aqueous solution was studied using steady-state fluorescence measurements. Fluorescence experiments were carried out with PEI−Py containing approximately one Py group per 900 monomer polymer units (PEI−Py/900) at two different pH and at two polymer concentrations. When SDS was added to the PEI−Py/900, at both pH 6.6 and pH 10, the monomer fluorescence IM increased significantly, with a much less pronounced change in the excimer emission (IE). In the absence of SDS, the monomer intensity is substantially reduced due to quenching of Py* by secondary and tertiary amino groups of the polymer, whereas the excimer emission is less affected. The increase in IM with increasing SDS concentration indicates that SDS molecules protect Py* from quenching, through formation of polymer-bound micelles formed at the sites of the Py groups. In contrast, IE remains practic...
