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VISCOELASTIC PROPERTIES OF ALGINATE GELS BY OSCILLATORY DYNAMIC TESTS
Author(s) -
MORESI MAURO,
MANCINI MARCO,
BRUNO MARIA,
RANCINI ROBERTO
Publication year - 2001
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.1745-4603.2001.tb01243.x
Subject(s) - viscoelasticity , materials science , relaxation (psychology) , viscosity , stiffness , dynamic mechanical analysis , modulus , rheology , chemistry , thermodynamics , polymer chemistry , composite material , polymer , physics , psychology , social psychology
The response of several mannuronic and guluronic alginate gels to oscillatory tests was studied by varying the alginate concentration (c) from 1.0 to 1.75% w/w. Frequency dependence of the complex shear modulus G* discriminated between the alginate gels in terms of their different orders of the relaxation function α and “gel stiffness” A α values using Friedrich and Heymann theory (1988). Guluronic alginate gels were approximately 4‐5 times stronger than mannuronic ones, their networks exhibiting higher or smaller rates of stress relaxation, respectively. For both alginate types the gel stiffness parameter A α was found to be a power function of alginate concentration and type (intrinsic viscosity [η], GG block diad frequency, F GG , and average G‐block length, N G ), its sensitivity with respect to c and N G being greater than that to [η] and F GG.