Abstract
Synthesis of the sodium salt of carboxymethyl starch was carried out by modification of corn starch in the solid phase. It was determined that moistening of the reaction mixture by small quantities of water, alcohols, and their water solutions caused a considerable increase in the degree of substitution of obtained products. By varying the ratio of the initial reagents and nature of solvent for moistening of reaction mixture samples of the sodium salt of carboxymethyl starch with the degree of substitution from 0.12 to 0.95 have from obtained. It was shown that the degree of substitution in obtaining product depended not only on the ratio of initial reagents but also on the nature of the used solvent. The morphology and structure of samples of the sodium salt of carboxymethyl starch have been investigated. By method of rotational, viscometry rheological properties of water solutions of the sodium salt of carboxymethyl starch was investigated and it was determined that with increasing degree of substitution dynamical viscosity of their solutions has increased
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