Frequency dependence of viscoelastic properties of some physical gels near the gel point | Zendy

Cuvelier Gérard | Zendy; Launay Bernard | Zendy

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Frequency dependence of viscoelastic properties of some physical gels near the gel point

Author(s) -

Cuvelier Gérard,

Launay Bernard

Publication year - 1990

Publication title -

makromolekulare chemie. macromolecular symposia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.257

H-Index - 76

eISSN - 1521-3900

pISSN - 0258-0322

DOI - 10.1002/masy.19900400105

Subject(s) - gel point , viscoelasticity , biopolymer , gelatin , exponent , power law , sol gel , materials science , melting point , dynamic mechanical analysis , dynamic modulus , polymer , thermodynamics , chemistry , composite material , physics , nanotechnology , organic chemistry , mathematics , linguistics , philosophy , statistics

The sol‐gel and gel‐sol transitions of three biopolymer gelling systems (gelatin, iota‐carrageenan and xanthan‐carob) have been studied by dynamic measurements. At the gel point a power law dependence of the storage (G') and loss (G”) moduli on frequency is observed, with an exponent varying from 0.5 to 0.65. The variation of log(tg δ = G”/G') versus the gelation (or melting) parameter (time or temperature) at different frequencies leads to a precise determination of the gel point.

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