Sinteza derivata na bazi skroba i njihova primena u procesima skrobljenja pređe

The intention of this study was to check the feasibility of the implementation of the newly synthesized biopolymeric materials for sizing of cotton yarn, based on the basic principles of chemical modification and practical verification in industrial conditions. The paper includes acid hydrolysis of corn and potato starch up to the controlled molecular weight with graft–polymerization of acrylamide, acrylic acid, 2-hydroxyethyl methacrylate and methacrylic acid on hydrolyzed starch for improving the hydrophilicity and solubility, capability of forming the film, increasing the potential of the adhesive potential, avoidance of retrogradation phenomena, etc. The objectives of the research were primarily related to the establishment of appropriate, environmentally–friendly and productive systems for sizing cotton yarns through the analysis and systematization of a large number of synthesis methods in conjunction with the characterization and properties of the graft copolymer. The results showed the following: (a) benzoyl peroxide initiator was very successful in grafting of acrylamide, azobisisobutyronitrile initiator in grafting of acrylic acid and 2-hydroxyethyl methacrylate, while the initiator potassium persulfate was the best in the grafting of methacrylic acid on size; (b) contribution of hydrolysis and grafting, the percentage of grafting and grafting efficiency, the conversion of monomers to polymer, molar mass as well as FTIR analysis confirmed that this is a new product made of starch and vinyl monomers; (c) after impregnation of single yarn and double yarn (type of yarn), it was found that coarse single yarn as well as double yarn absorb or bind to themselves more size in all cases compared to the finer yarns, which is associated with a higher volume in scope, looser structure, as well as a smaller number of turns; (d) after sizing, warp becomes more uniform in thickness, which is the effect of size deposit mass to yarn when different types of deformity along