Abstract
This work presents synthesis and characterization of copolymer obtained by grafting of acrylic acid on hydrolyzed potato starch in the presence of various initiators (azobisisobutyronitrile, potassium persulfate and benzoyl peroxide). Starch hydrolysis was made to reduce average molar mass, i.e. to reduce macromolecule size. Grafting of monomer was performed to produce a product that can be used in textile treatment, for example, in yarn sizing. Various initiators were used, primarily, to produce graft polymer on starch and to obtain thinner or thicker packaging of side chains that can have a great influence on the behavior of textile yarns impregnated with these copolymers. Potassium persulfate, as initiator, proved to be very successful in grafting of acrylic acid on hydrolyzed starch, in terms of yield results, graft percentage and efficiency. FTIR spectra of hydrolyzed and grafted starch confirm by their characteristic bands that grafting was successful. Results show that the highest quantity of monomer is found in the sample of hydrolyzed starch grafted in the presence of benzoyl peroxide. Molar masses of hydrolyzate and copolymer show significant differences ranging from 1.83 × 103 to 7.13 × 106 g/mol.
Highlights
Starch possesses valuable properties like biodegradability, abundant resources, lower environmental contamination, low cost, adhesive properties, ability to make layers, etc
Final product designed in this way, hydrolyzed starch grafted with acrylic acid can be used in textile industry for yarn sizing or textile finishing
In order to make calibration curve to quantitatively process gel-chromatograms of tested starch copolymers, calibration of Zorbax PSM-300 gel column was carried out using narrow molar mass distribution dextran samples (Pharmacia)
Summary
Starch possesses valuable properties like biodegradability, abundant resources, lower environmental contamination, low cost, adhesive properties, ability to make layers, etc. High amounts of starch are used as textile yarn sizing agent and in papermaking. Starch films are not flexible and adhesion to surfaces is never good enough [1]–[3] No matter whether it is used in textile industry, for example as a sizing agent, or in papermaking, adequate and sufficient adhesion to fibers or paper is considered the most significant characteristic for this kind of applications. Research to improve starch adhesion to fibers is focused to chemical modification. Several techniques are used with the aim to introduce a chemical group or to modify starch molecules in some way to improve adhesion. Final product designed in this way, hydrolyzed starch grafted with acrylic acid can be used in textile industry for yarn sizing or textile finishing
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