Proceedings of the XIIIth International Congress on Rheology edition:Vol. 1 pages:387-389
XIIIth International Congress on Rheology edition:XIII location:Cambridge, UK date:20-25 August 2000
Using rheological shear and oscillation measurements, it is possible to determine the viscoelastic properties of a system quantitatively, as a function of the many influential parameters. The aim here was to establish structure-property relationships for a polymer in a solvent system from the viscoelastic material functions correlated with data from polymer analysis These structure-property relationships make it possible to quantitatively predict the viscoelastic properties as a function of the molecular parameters.
In addition to these rheo-mechanical measurements, recent years have also seen the parallel determination of rheo-optical material functions, such as flow birefringence and flow dichroism, used in order to investigate macroscopic viscoelastic flow behaviour at a molecular level. Apart from determining these moduli, which are proportional to rheo-mechanical parameters, it was also possible to determine the orientation of polymer segments and aggregated structures. In particular, it became possible to explain aggregation behaviour during the sol-gel transition and during temperature-induced phase separation on a molecular level. The overriding aim of these investigations was to establish new structure-property relationships by correlating the rheo-mechanical and the rheo-optical material functions.