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The effect of surfactant concentration on the complex structures of the thermosensitive poly(N-isopropylacrylamide) (PNIPAM) with sodium n-dodecyl sulfate (SDS) in dilute aqueous solutions and below the lower critical solution temperature were investigated using viscometry, two-dimensional nuclear Overhauser effect spectroscopy (2D NOESY), and pulsed-field gradient diffusion nuclear magnetic resonance (NMR). The interactions of PNIPAM and SDS were found to exhibit strong dependences on the SDS concentration. The amount of polymer-bound and free SDS at various SDS concentrations was calculated from the diffusion coefficients of SDS. At SDS concentrations below the critical aggregation concentration (CAC) of around 0.86 mM, the interaction between PNIPAM and SDS was very minimal, resulting in almost no change in the intrinsic viscosity and hydrodynamic size of the polymer. At SDS concentrations above 0.86 mM but below 7.0 mM, the intrinsic viscosity of the polymer as well as the amount of polymer-bound SDS ...
| Authors: | Jianqiang Chen; Hongjuan Xue; Yefeng Yao; Hu Yang; Aimin Li; Min Xu; Qun Chen; Rongshi Cheng | |
| Journal: | Macromolecules | |
| Year: | 2012 | |
| DOI: | 10.1021/ma301003r | |
| Publication date: | 29-06-2012 |
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