Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER

CPP 5.17: Poster

Freitag, 4. März 2005, 17:15–19:00, Poster TU D

Estimating the molecular weight distribution of polymer melts from viscoelastic responds — •Andreas W. Liehr, Philippe-André Bourdin, and Christian Friedrich — Material Research Center Freiburg, Stefan-Meier-Str. 21, D-79104 Freiburg i. Br.,Germany

Fast and easy accessible methods for the estimation of the molecular weight distribution of polymer melts is an important issue of modern polymer physics. In this talk we discuss approaches basing on measured linear viscoelastic properties of the samples. Applying advanced models [1] describing the interrelation between molecular structure and viscoelastic properties we are able to focus on the solution of the inverse problem. Starting point is a contour length fluctuation model with Rouse modes, which predicts the relaxation modulus of a polymer melt from its molecular weight distribution. The inverse problem resulting from this model is solved by a nonlinear regularization method [2].

[1] van Ruymbeke, E. ; Keunings, R. ; Stéphenne, V. ; Hagenaars, A. ; Bailly, C.: Evaluation of Reptation Models for Predicting the Linear Viscoelastic Properties of Entangled Linear Polymers. In: Macromolecules 35 (2002), S. 2689–2699

[2] Honerkamp, J. ; Weese, J.: Determination of the Relaxation Spectrum by a Regularization Method. In: Macromolecules 22 (1988), Nr. 11, S. 4372–4377