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Citation: Bo Shuqin, Yang Guojun, Pei Yihui, Cheng Rongshi. Determination of Specific Refractive Index Increments of Water Soluble Polymers by Quantitative Size Exclution Chromatography[J]. Chinese Journal of Applied Chemistry, ;1995, 12(4): 13-17. shu

Determination of Specific Refractive Index Increments of Water Soluble Polymers by Quantitative Size Exclution Chromatography

Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received Date: 30 October 1994
Revised Date: 11 February 1995

The specific refractive index increments of a number of water soluble polymers in pure water were determined by quantitative size exclusion chromatography (SEC) equiped with a refractive index detector. The results obtained are identical with literature values de-termined by conventional static methods. For SEC with aqueous salt solution as eluent, whick is similar to a mixed solvei,system,the chromatographic separation process of the so-lute with surrounding solvent molecules is equivalent to dialysis process. Under the condi-tions of chromatographic apparatus equiped with and without SEC separation columns, from the measured refractive index response constants the refractive index increment under con-stant chemical potential ν_μ and under constant composition of the solvent ν_k of the polymers could be determined. For the neutral polymer,polyacrylamide in aqueous NaCl solution, ν_μ > ν_k, that indicates the preferential adsorption of salt molecules by polymer chain, while for the polyelectrolyte sodium polystyrene stilfonate, ν_μ < ν_k, i.e. the water molecules are prefer-entially adsorbed by polymer chain.
- water-soluble polymer,
- refractive index increment,
- size exclution chromatogrphy
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