Determination of Specific Refractive Index Increment (dn/dc)_μ at a Constant Chemical Potential,for Solutions of Polymer in Mixed Solvents by the GPC Method  

作　　者：WANG Qing-guo LI Xiao-wen CHENG Rong-shi 

机构地区：[1]Department of Chemistry, Shenzhen University, Shenzhen 518060, P. R. China [2]Department of Chemistry, Nanjing Untverstty, Nanjing 210093, P. R. China

出　　处：《Chemical Research in Chinese Universities》2007年第5期602-606,共5页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.20474040).

摘　　要：A new chromatographic method is described for the determination of specific refractive index increment（dn/dc）μ at a constant chemical potential,for polymer/mixed solvent systems.In this method the（dn/dc）is obtained by measuring the areas of solvated-polymer peaks when the mixed solvent is used as an eluent.Values of（dn/dc）μ for the poly（dimethylsiloxane）（PDMS）-benzene-methanol system,determined by the proposed method are in good agreement with those determined by the conventional dialysis method.The new approach has the advantages of simplicity,fast speed,and high reproducibility.The experimental results for stearic acid-chloroform-methanol system show that this method can also be applied to nonpolymer/mixed solvent systems for the determination of（dn/dc）μ.A new chromatographic method is described for the determination of specific refractive index increment（dn/dc）μ at a constant chemical potential,for polymer/mixed solvent systems.In this method the（dn/dc）is obtained by measuring the areas of solvated-polymer peaks when the mixed solvent is used as an eluent.Values of（dn/dc）μ for the poly（dimethylsiloxane）（PDMS）-benzene-methanol system,determined by the proposed method are in good agreement with those determined by the conventional dialysis method.The new approach has the advantages of simplicity,fast speed,and high reproducibility.The experimental results for stearic acid-chloroform-methanol system show that this method can also be applied to nonpolymer/mixed solvent systems for the determination of（dn/dc）μ.

关 键 词：Specific refractive index increment GPC Poly（dimethylsiloxane） Stearic acid 

分 类 号：O634.41[理学—高分子化学]