高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (1): 111.

• 论文 • 上一篇    下一篇

十二烷基甜菜碱与聚乙烯吡咯烷酮相互作用的研究

郝京诚1, 梁芳珍1, 刘树海1, 任建成1, 鲁绍芬1, 李干佐2, 汪汉卿3   

  1. 1. 山东师范大学表面与界面化学实验室, 济南, 250014;
    2. 山东大学胶体与界面化学研究所, 济南, 250100;
    3. 中国科学院兰州化学物理研究所, 兰州, 730000
  • 收稿日期:1996-11-28 出版日期:1998-01-24 发布日期:1998-01-24
  • 通讯作者: 郝京诚,男,32岁,博士,副教授.
  • 作者简介:郝京诚,男,32岁,博士,副教授.
  • 基金资助:

    国家教育委员会山东大学胶体与界面化学开放实验室资助课题.

The Interaction Between Dodecyl Betaine and Polyvinylpyrrolidone

HAO Jing-Cheng1, LIANG Fang-Zhen1, LIU Shu-Hai1, REN Jian-Cheng1, LU Shao-Fen1, LI Gan-Zuo2, WANG Han-Qing3   

  1. 1. Laboratry of Surface and Interface Chemistry, Shandong Normal University, Jinan, 250014;
    2. Institute of Colloid and Interface Chemistry, Shandong University, Jinan,250100;
    3. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou,730000
  • Received:1996-11-28 Online:1998-01-24 Published:1998-01-24

摘要: 通过表面张力测定和13C NMR、ESR波谱研究了十二烷基甜菜碱(C12BE)与聚乙烯吡咯烷酮(PVP)的相互作用.表面张力测定表明,在pH=6.5及NaCl存在下,C12BE与PVP之间有明显的相互作用,可形成C12BE/PVP复合物,且C12BE-PVP混合溶液的γ-lgc曲线出现2个转折点,第一个转折点时C12BE浓度c1(C12BE-PVP开始缔合)低于C12BE的cmc值;而第二个转折点时C12BE浓度c2(C12BE-PVP缔合达饱和)大于cmc值.(c2-c1)与PVP浓度呈线性关系.PVP降低C12BE胶束化标准自由能(△G0)随PVP浓度增加而增大.13C NMR测定表明,PVP骨架上α-CH、β-CH2和吡咯环上与N相连的亚甲基吸附于C12BE胶束表面的碳氢链部位,屏蔽了C12BE胶束表面碳氢链与水的接触.ESR波谱表明,PVP-C12BE聚集体"界面"的粘度高于C12BE胶束"界面"的粘度.

关键词: 十二烷基甜菜碱(C12BE), 聚乙烯吡咯烷酮(PVP), 13C NMR谱, ESR谱, 表面张力

Abstract: The association and standard free energy of formation of the complex between dodecyl betaine(C12BE) and polyvinylpyrrolidone(PVP) in aqueous solution have been investigated by using 13C NMR, ESR and surface tension measurement on the air/water interface.It is found that the basic structure of the complex is a micelle-like aggregate, the C12BE molecules were assembled on the methine(α), methylene(β) carbon in the backbone, and the methylene carbon attached to the nitrogen of PVP molecules, and shielding hydrocarbon groups on the surface of the micelle from contact with water. Our results also confirm that the micellization process in the presence of PVP occurs at a lower concentration than that at the critical micelle concentration. The effectiveness of PVP in lowering the free energy of formation of the surfactant aggregates in aqueous solutions increases with the increasing concentrations of PVP. The interfaclal viscosity of the aggregates of PVP-C12BE is higher than that of C12BE ones.

Key words: Dodecyl betaine, Polyvinylpyrrolidone, NMR, ESR, Surface tension

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