Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.10: Poster

Montag, 24. März 2003, 19:00–21:00, ZEU/250

Solid-state NMR investigation of molecular orientation of glassy and rubber-like polymers — •Michael Wendlandt — ETH Zentrum, CNB E95, Universitätsstrasse 6, CH-8092 Zürich/Schweiz

Global distribution functions of molecular orientation, that develops in glassy and rubber-like polymers under deformation, have been determined direct, i.e. model-free, via lineshape analysis of series of dependent 1D solid-state ²H-NMR spectra. Careful reconstruction of the distribution functions of molecular orientation from the experimental series of 1D spectra via regularization methods allow to obtain quantitative results with high accuracy beyond the power of common scattering techniques. As a model polymer Poly(methylmethacrylate) (PMMA) has been chemically cross-linked with varying degrees of cross-link densities and deformed in compression below and above its glass transition temperature at small to finite strains far beyond the yield point. Results can be interpreted successfully in context with common affine and pseudo-affine models.