PVP-LiCl-DMF溶液体系的流变学特性及相互作用  

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

作　　者：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] 

机构地区：[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,北京100080 [3]中国科学院研究生院,北京100871

出　　处：《高等学校化学学报》2007年第3期575-579,共5页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划项目(批准号:2003CB615602);国家自然科学基金(批准号:50403026)资助

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.13CNMR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.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 ene0rgy 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.

关 键 词：聚乙烯吡咯烷酮 流变学 红外光谱 核磁共振 

分 类 号：O631[理学—高分子化学]