4th International workshop on nonequilibrium thermodynamics and complex fluids

	IWNET 2006	4th International workshop on nonequilibrium thermodynamics and complex fluids 3-7 september 2006, Rhodes, Greece

Home Scope Location Speakers Program Abstracts Author index Organizing Committee Scientific Committee Venue & Accomodation Registration News Contact		ORAL PRESENTATION Session: 7 Applications to complex materials: glasses, micelles, colloids, blends, interfaces (scheduled: Thursday, 09:40 ) Extrudate swell control by balancing short and long polyethylene chains using multi-scale modeling C.F.J. den Doelder Dow Benelux B.V., P.O. Box 48, 4530AA, Terneuzen, The Netherlands The presentation first introduces the current trends in complex fluids modeling at Dow. Second, as an example, a multi-scale modeling based polymer design study is presented. Designed molar mass distributions enabled from polyethylene synthesis capabilities are fed to a double reptation mesoscale model to derive polymer elasticity. The calculated compliance is used as correlator to extrudate swell, improving on existing empirical correlations. The correlation comprises a connection between linear viscoelasticity and non-linear complex processing behavior. Its validity is made plausible from the related dynamics of recovery after deformation, but an intriguing timescale mismatch needs to be bridged. Non-equilibrium thermodynamics might provide theoretical tools to build this bridge. © IWNET 2006

		© and Kleanthi for IWNET 2006