Proceedings of the XIVth International Congress on Rheology pages:FB19-1-3
XIVth International Congress on Rheology edition:XIV location:Seoul, Korea date:22-27 August 2004
Polysaccharides in solution have a wide field of technical applications as additives to adjust the viscoelastic properties of a fluid. Especially their general tendency to form aggregates in solution via hydrogen bonds of free hydroxygroups enables the usage as gelling agents. In the past, linear viscoelastic rheological measurements of the gelation kinetic and the gel properties have proven to be a useful tool to describe the material properties of a gel.
In the present paper we want to enhance these techniques with rheo-mechanical and rheo-optical measurents of non-linear shear flows in the sol-state to directly determine the gel seed formation, their stability and deformability and correlate these properties with time- and thermogradient dependent gelation kinetics and gel properties of carrageenans, cellulosic derivatives and -glucans.