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- W1538104214 abstract "Na-CMC or sodium carboxylmethyl cellulose is a water soluble anionic polymer obtained by introducing carboxymethyl groups along the cellulose chain. Na-CMC is usually synthesized by the alkali catalyzed reaction of cellulose with monochloroacetic acid. The functional properties of Na-CMC depend on the degree of substitution of the cellulose structure (i.e. how many of the hydroxyl groups are substituted per monomer unit), and also on the chain length of the cellulose backbone. The degree of substitution of Na-CMC is usually determined according to ASTM D1439 which evolves the conversion of the Na-CMC to free acid then again forming Na-CMC by adding excess alkali and finally titrating the excess alkali with standard hydrochloric acid (0.3 N). The used volume of the standard alkali determines the degree of substitution. These existing chemical methods for determining the degree of substitution are not very convenient and very time-consuming involving the use of hazardous chemicals. In this research, we have evaluated that the scanning electron microscope equipped with Energy Dispersive X-Ray Analysis can be used to directly determine the degree of substitution." @default.
- W1538104214 created "2016-06-24" @default.
- W1538104214 creator A5010167311 @default.
- W1538104214 creator A5059458608 @default.
- W1538104214 date "2011-12-12" @default.
- W1538104214 modified "2023-09-27" @default.
- W1538104214 title "A scanning electron microscope based new method for determining degree of substitution of sodium carboxymethyl cellulose" @default.
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- W1538104214 doi "https://doi.org/10.1111/j.1365-2818.2011.03583.x" @default.
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