Leipzig 1999 – scientific programme

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PO: Polymerphysik

PO 5: Poster: Molekulare Dynamik

PO 5.9: Poster

Tuesday, March 2, 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.