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PVP在水/四氢呋喃混合溶剂中粘度的研究
任琳,朱平平*,杨海洋,张劲,张士诚
作者单位E-mail
任琳 中国科学技术大学,高分子科学与工程系,合肥,230026  
朱平平* 中国科学技术大学,高分子科学与工程系,合肥,230026 zhupp@ustc.edu.cn 
杨海洋 中国科学技术大学,高分子科学与工程系,合肥,230026  
张劲 石油大学,石油天然气工程学院,北京,102249  
张士诚 石油大学,石油天然气工程学院,北京,102249  
摘要:
采用高分子稀溶液粘度法研究了聚乙烯基吡咯烷酮(PVP)在水(H2O)和四氢呋喃(THF)组成的混合溶剂中的粘度行为,结果表明, PVP在由良溶剂H2O和非溶剂THF组成的混合溶剂中的特性粘数可以大于其在良溶剂H2O中的特性粘数,并且随着THF含量的增加呈现先增大后减小的变化趋势,特性粘数的最大值出现在THF的体积分数约为0.3处,而且无机盐Na2SO4的加入没有改变特性粘数的最大值位置,但减小了特性粘数值.基于分子的基本特征和分子间的相互作用,特别是考虑到混合溶剂中新的结构--包合结构的形成及其对溶剂性能
关键词:  聚乙烯基吡咯烷酮  混合溶剂  粘度  包合结构
DOI:10.1088/1674-0068/17/4/508-512
分类号:
基金项目:
Studies on Viscosity of PVP in Mixed Solvents H2O/THF
Ren Lin,Zhu Pingping*,Yang Haiyang,Zhang Jin,Zhang Shicheng
Abstract:
The dilute solution viscometer is used to research the ternary solution of Poly(N-vinylpyrrolidone) (PVP) in mixed solvents H2O/ THF. H2O is the good solvent of PVP,and THF the non-solvent. The viscometric study indicates that the intrinsic viscosity η of PVP may be higher in the mixed solvents than in the pure solvent H2O and change with the variation of the volume fraction of THF,Ф. It is found that at first η increases slowly and then decreases rapidly with the adding of THF. A maximum value of η appears at Ф20. 3,which decreases after the adding of Na2SO4,but the value of Ф,at which the maximum value of η appears,varies relatively little. The change in values of η and coil dimensions in mixed solvents are discussed in terms of the molecular characteristics of the system and intermolecular interactions,especially in terms of the form of new structure—clathrate hydrate structure,and the relative influence upon the nature of solvent. It is stated that the properties of ternary systems (polymer / mixed solvent)might not be deduced directly from those of the binary systems composed of each component liquid.
Key words:  Poly(N-vinylpyrrolidone),Mixed solvent,Viscosity,Clathrate hydrate structure