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Novel Acrylic‐modified Acacia Gum Thickener: Preparation, Characterization and Rheological Properties
Author(s) -
Nickzare Morteza,
ZohuriaanMehr Mohammad J.,
Yousefi Ali A.,
ErshadLangroudi Amir
Publication year - 2009
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.200800066
Subject(s) - ceric ammonium nitrate , copolymer , rheology , thickening agent , aqueous solution , gum arabic , acrylonitrile , gum acacia , chemistry , fourier transform infrared spectroscopy , chemical engineering , materials science , hydrolysis , polymer chemistry , organic chemistry , polymer , thickening , composite material , polymer science , food science , engineering
Acacia gum (Arabic gum; A‐gum) is a branched complex heteropolysaccharide with extremely high solubility and extraordinary Newtonian behavior in solution at concentrations even higher than 25%. In this work, A‐gum thickening properties were highly improved to form non‐Newtonian fluids in water at concentrations below 2%. The thickener was prepared by graft copolymerization of acrylonitrile onto A‐gum using ceric ammonium nitrate. The synthesized graft copolymers (differing in percentage and molecular weight of the grafted acrylic chains) were then alkaline‐hydrolyzed under various conditions (i.e. temperature, time and the NaOH concentration) to prepare the thickening agents. FTIR and elemental analyses were used for elucidating the structure of samples. Steady‐shear rheological properties of aqueous solutions of the thickener at variety of concentrations, temperatures and saline solutions were investigated in details.