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CHARACTERIZATION OF GELLAN GELS BY UNIAXIAL COMPRESSION, STRESS RELAXATION AND CREEP 1
Author(s) -
NUSSINOVITCH A.,
AK M. M.,
NORMAND M. D.,
PELEG M.
Publication year - 1990
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.1990.tb00463.x
Subject(s) - creep , materials science , stress relaxation , rheology , composite material , viscoelasticity , modulus , relaxation (psychology) , compression (physics) , stress (linguistics) , deformation (meteorology) , syneresis , social psychology , linguistics , philosophy , biochemistry , chemistry , psychology
The rheological properties of 0.5–2.5% gellan gels were evaluated by uniaxial compression, stress relaxation and creep tests. The gel's strength was in the range of 0.1–1 kg.cm ‐2 and their deformability modulus 1–6 kg.cm ‐2 . The asymptotic modulus determined in relaxation tests at two strains and the asymptotic creep compliance determined under two loads indicated that gellan gels have a yielding structure. The strains sustained in creep were considerably higher than the failure strain in uniaxial compression. Weight loss due to syneresis was on the order of 4–38% depending on the gum concentration, the deformation level in relaxation or the load in the creep tests.