title: Noncovalently and covalently cross-linked polyurethane gels as alignment media and the suppression of residual polymer signals using diffusion-filtered spectroscopy.
abstract: With polyurethane (PU), a novel alignment medium for organic solvents is introduced and characterized, which is very robust and easy to produce on a large scale. Linear PU already constitutes an elastomer gel with several solvents based on its ability to form hydrogen bonds. Covalent cross-linking of the polymer with accelerated electrons provides an alignment medium with different properties. However, PU exhibits a number of undesired polymer signals in corresponding spectra, which ideally have to be removed spectroscopically. Within this context, we demonstrate the applicability of diffusion-filtered experiments for removal of the polymer signals. Example spectra for the usefulness of PU alignment media are provided for the common test molecules strychnine and norcamphor.
authors.affiliation: Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Kaden
authors.forename: J Christoph
authors.initials: JC
authors.lastname: Freudenberger
authors.forename: Burkhard
authors.initials: B
authors.lastname: Luy
mesh_terms: D003432:Cross-Linking Reagents / Q000737:chemistry*; D004058:Diffusion; D005782:Gels / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D005782:Gels; D011140:Polyurethanes