Evaluation of nitrogen containing starch and hydrolyzed starch derivatives as a size base materials for cotton yarns

The changes in the molecular structure of native maize starch and hydrolyzed starches derived thereof brought about by introducing nitrogen containing group via cyanoethylation, carbamoylethylation, as well as carbamation were studied. The effect of these changes on the technical properties of cotton yarns sized with the latter chemically modified starches was investigated. It was found that (a) the nitrogen content of the latter derived modified starch products increases by increasing the extent of hydrolysis; (b) the apparent viscosity of these pastes prepared from those products depends on the degree of hydrolysis prior to chemical modification. On the other hand, cotton yarns sized with these starch derivatives were evaluated as sizing agent via measuring tensile strength, elongation at break and abrasion resistance. It was also found that the highest values of the latter aforementioned properties were obtained with cotton yarns sized with carbamoylethylated starch derived from native and hydrolyzed starches.