We report a set of viscoelastic measurements in concentrated aqueous solutions of a copolyrner micellar system with short-range inter-micellar attractive interactions, a colloidal system characterized, in different regions of the composition-temperature phase diagram, by the existence of a percolation line (PT) and a kinetic glass transition (KGT). Both these transitions cause dramatic changes in the system viscoelasticity. Whereas the observed variations of the shear moduli at the PT are described in terms of percolation models, for the structural arrest at the KGT we investigate the frequency-dependent shear modulus behaviours by using a mode coupling theory (MCT) approach.
A mode coupling theory analysis of viscoelasticity near the kinetic glass transition of a copolymer micellar system / Francesco, Mallamace; Tartaglia, Piero; Wei Ren, Chen; Antonio, Faraone; Sow Hsin, Chen. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 16:42(2004), pp. S4975-S4986. (Intervento presentato al convegno Workshop on Structural Arrest Transitions in Colloidal Systems with Short-Range Attractions tenutosi a Messina, ITALY nel DEC 17-20, 2003) [10.1088/0953-8984/16/42/013].
A mode coupling theory analysis of viscoelasticity near the kinetic glass transition of a copolymer micellar system
TARTAGLIA, Piero;
2004
Abstract
We report a set of viscoelastic measurements in concentrated aqueous solutions of a copolyrner micellar system with short-range inter-micellar attractive interactions, a colloidal system characterized, in different regions of the composition-temperature phase diagram, by the existence of a percolation line (PT) and a kinetic glass transition (KGT). Both these transitions cause dramatic changes in the system viscoelasticity. Whereas the observed variations of the shear moduli at the PT are described in terms of percolation models, for the structural arrest at the KGT we investigate the frequency-dependent shear modulus behaviours by using a mode coupling theory (MCT) approach.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
