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Verhandlungen
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DPG

Leipzig 1999 – wissenschaftliches Programm

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PO: Polymerphysik

PO 5: Poster: Molekulare Dynamik

PO 5.9: Poster

Dienstag, 2. März 1999, 14:00–16:00, Foyer

Residual Diplar Couplings in Cross-linked and Stretched Elastomers: Determination and Imaging — •Dan.E. Demco, L. Gasper, M. Schneider, and B. Bl"umich — Inst f. Macrom. Chem., RWTH-Aachen, Worringerweg 1, 52074 Aachen

1H spectral spin diffusion as well as dipolar encoded longitudinal magnetization decays, double- and triple-quantum NMR build-up curves are introduced for measuring site selective residual dipolar couplings of functional groups and between functional groups in poly(styrene-cobutadiene) and synthetic polyisoprene elastomers. Nonrotating sample are considered with different cross-link density and extension ratios. Double- and triple-quantum filtered 1H NMR spectra give access to chemical site selective residual couplings. 1H residual dipolar coupling contrast filters based on the above NMR methods were implemented and parameter images on heterogenious elastomers were measured.

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