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- W2034884988 abstract "Generally, the insoluble calcium salt of carboxymethyl cellulose can be quantitatively transformed in a batch process into its sodium form using chelating resin Lewatit TP-208. The resulting sodium carboxymethyl cellulose, having a fairly low degree of substitution close to 0.6, was analysed using size exclusion chromatography with multiangle light scattering/refractometric detection. Commercial samples of sodium carboxymethyl cellulose having degree of substitution 0.7 and 1.2 were used to highlight the relation between the degree of substitution and the presence of aggregated structures. It was found that all calcium/sodium transformed carboxymethyl cellulose samples contain a significant amount of macrogel particles larger than 5 μm which can be removed by centrifugation or filtration. Centrifuged and filtered samples were then shown to contain significant amounts of smaller aggregated structures (fringed micelles) which were found also in sodium carboxymethyl cellulose reference samples where their amount was inversely proportional to their degree of substitution. Because size exclusion chromatography separates macromolecules according to their hydrodynamic volume, linear and aggregated structures having the same hydrodynamic volume, but entirely different molar mass, are eluted together and a significant heterogeneity in terms of molar mass at a fixed elution volume is found especially at lower sample elution volumes. Hence, molar mass distributions become undefined. Fortunately, the elution was found to be homogeneous in terms of experimentally accessible radii of gyration and reliable size distributions could be evaluated." @default.
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- W2034884988 date "2005-01-01" @default.
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- W2034884988 title "Analysis of calcium salt of carboxymethyl cellulose: size distributions of parent carboxymethyl cellulose by size-exclusion chromatography with dual light-scattering and refractometric detection" @default.
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- W2034884988 doi "https://doi.org/10.1016/j.carbpol.2004.08.019" @default.
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