水溶性聚合物与十二烷基硫酸钠相互作用的^1H NMR研究

INTERACTIONS OF WATER-SOLUBLE POLYMERS WITH SODIUM DODECYL SULFATE IN AQUEOUS SOLUTION STUDIED BY ~1H NMR

用^1H NMR方法研究了分别在2g／L聚乙烯吡咯烷酮(PVP)和2g／L聚乙烯醇(PVA)存在下，一系列不同浓度的十二烷基硫酸钠(SDS)溶液．二维NOESY实验表明，SDS在浓度为2.5mmol／L时形成胶束，且PVP被增溶到胶束内部；当SDS浓度低于2.5mmol／L时，PVP与SDS之间没有明显的相互作用．自旋-自旋弛豫时间的测量结果支持这一结论．实验中没有检测到PVA与SDS之间的相互作用．

Aqueous solutions of sodium dodecyl sulfate (SDS) at various concentrations in 2 g/L polyvinylpyrrolidone (PVP) and 2 g/L polyvinyl alcohol (PVA), respectively, were studied by ~1H NMR. Two-dimensional nuclear Overhauser enhancement spectroscopy (NOESY) experiments show that SDS starts to micellize at a concentration of 2.5 mmol/L, with PVP solubilized in the interior of the micelles. At SDS concentrations lower than 2.5 mmol/L, no significant interaction could be detected. Spin-spin relaxation measurements support this conclusion. The interaction between PVA and SDS was hardly detected.