THE SHAPE AND SIZE OF MACROMOLECULES OF CARBOXYMETHYL STARCH IN DILUTED SOLUTIONS

Autor(en): Stojanovic, Zeljko
Jeremic, Katarina
Jovanovic, Slobodan
Nierling, Wolfgang
Lechner, Manfred Dieter
Stichwörter: AMYLOPECTIN; AMYLOSE; AQUEOUS-SOLUTION; Branched clusters; Carboxymethyl starch; DEPENDENCE; DERIVATIVES; DOPPLER SHIFTS; Engineering; Engineering, Chemical; LASER-LIGHT SCATTERING; NONRANDOMLY BRANCHED MACROMOLECULES; POLYMER-SOLUTIONS; Static and dynamic light scattering; STRUCTURAL-PROPERTIES; Viscosimetry
Erscheinungsdatum: 2009
Herausgeber: ASSOC CHEMICAL ENGINEERS SERBIA
Journal: HEMIJSKA INDUSTRIJA
Volumen: 63
Ausgabe: 6
Startseite: 593
Seitenende: 602
Zusammenfassung: 
Carboxymethyl starch samples were prepared by etherification in heterogeneous media. Three samples were prepared from corn starch and three samples from potato starch. Degree of substitution of prepared samples ranged from 0.40 to 1.10. The samples were investigated by static and dynamic light scattering and viscosity of diluted solution in 0.10 M NaCl as solvent at 25 degrees C. The values of molar mass, M-w, radius of gyration, R-g, hydrodynamic radius, R-h, and limited viscosity number, [eta] were determined. It was found that the samples are similar to each other regardless of the type of starch and the degree of substitution. Fractal dimension, d(f), was equal to 2.380 (R-g - M-w) and 2.406 (R-eta - M-w), while parameter rho was 1.195. The values of fractal dimension and parameter rho are characteristic values for the behavior of branched clusters in thermodynamically good solvents.
ISSN: 0367598X
DOI: 10.2298/HEMIND0906593S

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