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Struktur und Eigenschaften gepfropfter Kartoffelstärke. IV. Fließverhalten von Lösungen
Author(s) -
Gruber E.,
Rahman A.,
Schurz I.
Publication year - 1974
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.19740260706
Subject(s) - starch , polyacrylic acid , acrylic acid , copolymer , polymer chemistry , viscosity , intrinsic viscosity , chemistry , macromolecule , polymer , limiting , chemical engineering , polymer science , materials science , organic chemistry , biochemistry , composite material , mechanical engineering , engineering
Structure and Properties of Grafted Potatoe Starch. IV. Flow Properties of Solutions. Solutions of graft copolymers of starch‐poly acrylic acid and starch polyacrylamid have lower viscosities than solutions of ungrafted starch. By grafting the coil density of the dissolved macromolecules is increased and the limiting viscosity number and the concentration dependence of viscosity decreases. The graft copolymers demand higher concentrations to give networksolutions than native starch does. Mixtures of starch and polyacrylic acid or polyacrylamid resp. show some diminution of viscosity in comparsion with starch. From this it is concluded, that the macromolecules of the synthetic polymer may penetrate into the coils of the polysaccharid molecules effecting contraction of the latter.