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Technological Evaluation of Nitrogen Containing Starch Derivatives as Sizing Agents
Author(s) -
Hebeish A.,
Ragheb A. A.,
Refai R.,
Saad M. A.,
Dokki I. Abd ElThalouth
Publication year - 1994
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19940460308
Subject(s) - starch , elongation , ultimate tensile strength , maize starch , materials science , viscosity , abrasion (mechanical) , chemistry , nitrogen , chlorine , polymer chemistry , chemical engineering , composite material , food science , organic chemistry , engineering
The structural changes brought about by introducing different nitrogen containing groups via cyanoethylation, carbamoylethylation and carbamation in the molecules of rice and maize starches and oxidized starches derived thereof and the onset of these changes on the technical properties of yarns sized with such starch products were investigated. It was found that the apparent viscosity of pastes prepared from those products depends on the nature of starch, the degree of oxidation prior to chemical modification, the nature of modification as well as the measuring conditions, i. e. the rate of shear and temperature. Cotton yarns sized using these starch derivatives were measured for yarn number, tensile strength, C.V.%, elongation at break and C.V.% in elongation. Besides, the weavability test expressed as the minimum number of cycles due to abrasion (St 1 ) and average number of cycles due to abrasion (St 6 ) were investigated. A comparison among modified starches prepared from rice starch would reveral that the highest value of St 1 is obtained with yarns sized using carbamoylethylated sample derived from unoxidized starch. With maize starch, on the other hand, the highest value of St 1 is obtained with cotton yarns sized using carbamoylethylated starch derived from starch oxidized by 1 g/l active chlorine.