高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

PVP-LiCl-DMF溶液体系的流变学特性及相互作用

郝超伟1,3, 赵莹1, 周勇1,3, 周丽娟1,3, 徐怡庄2, 王笃金1, 徐端夫1   

    1. 中国科学院化学研究所, 高分子科学与材料联合实验室, 高分子物理与化学国家重点实验室, 北京100080;
    2. 北京大学化学与分子工程学院, 稀土材料化学及应用国家重点实验室, 北京100871;
    3. 中国科学院研究生院, 北京 100049
  • 收稿日期:2006-07-31 修回日期:1900-01-01 出版日期:2007-03-10 发布日期:2007-03-10
  • 通讯作者: 赵莹

Investigation on the Rheological Characteristics and Interactions of PVP-LiCl-DMF Solution System

HAO Chao-Wei1,3, ZHAO Ying1, ZHOU Yong1,3, ZHOU Li-Juan1,3, XU Yi-Zhuang2, WANG Du-Jin1, XU Duan-Fu1   

    1. State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
    2. State Key Laboratory of Rare Earth Material Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    3. Graduate Schol of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2006-07-31 Revised:1900-01-01 Online:2007-03-10 Published:2007-03-10
  • Contact: ZHAO Ying

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被引次数

5

摘要： 利用流变学方法, 采用核磁共振和红外光谱技术开展了聚乙烯吡咯烷酮(PVP)和LiCl相互作用研究, PVP/LiCl/DMF浓溶液的表观粘度随着LiCl含量的增加而提高, 溶液的粘流活化能也相应增加. 13C NMR结果表明, 溶液中Li+与PVP的羰基之间存在相互作用, 这种相互作用改变了PVP分子的聚集状态. 红外光谱结果证实了PVP/LiCl复合物中Li+与PVP的羰基存在相互作用.

关键词: 聚乙烯吡咯烷酮, 流变学, 红外光谱, 核磁共振

Abstract: The interaction between poly(vinyl pyrrolidone)(PVP) and lithium chloride was studied by rheological method, 13C NMR and FTIR spectroscopy. The results showed that the apparent viscosity, the activation energy and the critical shear thinning rate of the concentrated PVP-LiCl-DMF solution are obviously influenced by lithium chloride. The apparent viscosity increases with the increasing of the content of the lithium chloride, and the activation energy of the solution increases as well, while the critical shear thinning rate decreases with increasing the content of lithium chloride. 13C NMR spectra proved the interaction between Li+ ion and the carbonyl group from PVP and DMF molecules in PVP/LiCl/DMF solution. These results indicate that the obvious interactions between Li+ ion and PVP in the solution result in the variation of the aggregation state of PVP molecules. The IR spectra of the PVP/LiCl composites showed that there are interactions between Li+ ion and carbonyl group in the lactam of PVP unit, and the curve fitting results also indicated the existence of several coordination structure between Li+ ion and carbonyl groups.

Key words: Poly(vinyl pyrrolidone), Rheology, FTIR spectroscopy, NMR spectroscopy

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