Improved Procedure for Dye-Partition Analysis of Hydroxy Endgroups in Polymers |
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Authors: | E Rizzardo D H Solomon |
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Institution: | Division of Applied , Organic Chemistry C. S. I. R. O. Melbourne , Victoria, Australia |
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Abstract: | Hydroxy radical-initiated poly(methyl methacrylate) and polystyrene have been reacted with o-sulfobenzoic anhydride to produce dye-active sulfonate groups and these were measured by a dye-partition technique with methylene blue. The important advantages over chlorosulfonic acid, previously employed in the dye-partition analysis for the conversion of hydroxy into sulfate groups, are that o-sulfobenzoic anhydride does not react at sites other than the hydroxy functionality and that it introduces the dye-active moiety (sulfonate) into the polymer via a hydrolytically more stable linkage. |
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