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Effect of some anionic starches on the stability of soil particles in water
- Weaver, M.O., Otey, F.H., Doane, W.M.
- Die Stärke = 1983 v.36 no.2 pp. 56
- starch products, anion exchange capacity, carboxymethylcellulose, hydrolysis, anions, carboxylation, soil physical properties, soil treatment, polymers, soil stabilization
- Three types of polyanionic starch derivatives were prepared: carboxymethyl starch, starch-g-poly(acrylic acid) and hydrolyzed starch-g-polyacrylonitrile. Each derivative was prepared at 5 levels of anion content, and the milliequivalent of carboxyl per gram of polymer (meqCOOH/g) was determined. Soil particles were treated with 3 concentrations of dispersions of each polymer, and stabilization activity was measured by wet sieving. For the specific soil sample used, the polymer with 2.8-2.9 meqCOOH in each class of derivative gave the greatest stabilization at reasonable dosage. On a weight basis, the anionic starches did not stabilize as well as their wholly synthetic counterparts; but on a weight of synthetic moiety and meqCOOH/100 g soil basis, the grafted starches outperformed poly(acrylic acid) and rivaled the performance of hydrolyzed polyarylonitrile.