Abstract
Tlie high-frequency (100 Hz-200 kHz) linear viscoelastic behaviour of gelatin in the transition zone was investigated. During the early stages of ageing, the dynamic shear modulus for a 4 wt% gelatin gel at the gel point at 25 µC was found to vary according to a power law G′ ∝G″ α ωn with n ≈ 0.75. Within the framework of a recent model by Groot et al. [J. Chem. Phys., 104,9202 (1996)], this value is consistent with a result derived earlier from large deformation rheology, suggesting that the network bonds in a gelatin gel are more stretched than an ideally swollen polymer chain. However, ageing effects observed in large deformation experiments are not observed for the small deformation high-frequency data.
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