激光光散射和电子自旋共振技术研究十二烷基硫酸钠与聚乙烯吡咯烷酮的相互作用  

Study on Interaction between Sodium Dodecyl Sulfate and Polyvinylpyrrolidone by Dynamic Light Scattering and Electron Spin Resonance

作　　者：董姝丽[1] 徐桂英[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室,济南250100

出　　处：《化学学报》2004年第7期674-679,共6页Acta Chimica Sinica

基　　金：国家自然科学基金 (No.2 99730 2 3)资助项目

摘　　要：应用动态激光光散射 (DLS)和电子自旋共振 (ESR)测定研究了单长链表面活性剂十二烷基硫酸钠 (SDS)与聚乙烯吡咯烷酮 (PVP)相互作用 .DLS测定结果表明 :SDS在水中形成动力学半径约为 61nm的胶束聚集体 ,PVP在水中卷曲成动力学半径约为 12nm的线圈 ,DLS确定的SDS临界胶束浓度 (cmc)为 6 4× 10 -3 mol·L-1,PVP SDS具有强的相互作用 ,PVP分子缠绕在SDS胶束聚集体的周围 ,屏蔽了SDS胶束聚集体表面碳氢基团与连续水相的接触 ;ESR结果表明 :自由基探针 5 doxylstearicacid在SDS形成胶束聚集体后 ,从一个较强极性的连续相转变到较小极性的胶束聚集体内核中 ,胶束聚集体内核的微粘度较纯水的大 ,SDS与PVP复合聚集体的微观粘度较SDS胶束溶液的大 ,ESR确定SDS的cmc为 6 8× 10 -3 mol·L-1.The interaction between sodium dodecyl sulfate (SDS) and polyvinylpyrrolidone (PVP) was investigated by using dynamic light scattering (DLS) and electron spin resonance ( ESR). DLS results indicated that the hydrodynamic radius (R-h) of SDS micelles was R(h)61 rim, and PVP molecules crimped into coils with R-h 12 rim. The critical micelle concentration (cmc) of SDS determined by DLS and ESR is 6.4 x 10(-3) and 6.8 x 10(-3) mol (.) L-1 respectively. respectively. PVP molecules strongly interact with SDS which are wrapped around the SDS micelles, shielding hydrocarbon groups on the surface of the micelle from contact with water. The change of the hyperfine splitting constant (A(N)) and the correlation time (tau(c)) from the spin-probe, 5-doxyl stearic acid, revealed that the polar and the high microviscosity in SDS micelles and PVP-SDS complex aggregates are lower than those in solvent. The microviscosity of PVP-SDS aggregates is higher than that of SDS micelles.

关 键 词：十二烷基硫酸钠 聚乙烯吡咯烷酮 相互作用 激光光散射技术 电子自旋共振技术 表面活性剂 水溶性大分子 

分 类 号：O631[理学—高分子化学]