title: Field-gradient NMR diffusometry in poly(ethylene oxide) melts confined to nanoscopic pores of solid methacrylate matrices.
abstract: Depending on the choice of matrix constituents, the diameters of strands of linear, monodisperse poly(ethylene oxide) confined to nanoscopic pores of cross-linked methacrylate matrices can be varied considerably. The samples were characterized by DSC, TEM, SEM and fringe field-gradient NMR diffusometry with respect to the strand diameter. A formalism evaluating diffusive spin echo attenuation curves based on the tube/reptation model allows the determination of the strand diameter. Values in the range 8-58 nm were found in accordance with TEM and SEM micrographs of shadow-cast freeze-fractured surfaces of the samples.
authors.affiliation: Sektion Kernresonanzspektroskopie, Universität Ulm, 89069 Ulm, Germany. elmar.fischer@physik.uni-ulm.de
authors.forename: Elmar
authors.initials: E
authors.lastname: Fischer
authors.forename: Uwe
authors.initials: U
authors.lastname: Beginn
authors.forename: Nail
authors.initials: N
authors.lastname: Fatkullin
authors.forename: Rainer
authors.initials: R
authors.lastname: Kimmich
mesh_terms: D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008689:Methacrylates / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D016062:Porosity
chemical_list: D008689:Methacrylates; D011092:Polyethylene Glycols