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Browsing by Author "Beginn U."

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Field-cycling NMR relaxometry of polymers confined to artificial tubes: Verification of the exponent 3/4 in the spin-lattice relaxation dispersion predicted by the reptation model

Kimmich R.; Seitter R.; Beginn U.; Möller M.; Fatkullin N. (1999)

2H field-cycling NMR relaxometry was applied to deuterated linear polyethyleneoxide (PEO) of different chain lengths confined in a porous matrix of cross-linked polyhydroxyethylmethacrylate (PHEMA). The PHEMA pore diameter ...
Field-gradient NMR diffusometry in poly(ethylene oxide) melts confined to nanoscopic pores of solid methacrylate matrices

Fischer E.; Beginn U.; Fatkullin N.; Kimmich R. (2005)

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 ...
Intra- and inter-chain fluctuations in entangled polymer melts in bulk and confined to pore channels

Kimmich R.; Fatkullin N.; Seitter R.; Fischer E.; Beginn U.; Möller M. (1999)

It is known that topological restraints by "chain entanglements" severely affect chain dynamics in polymer melts. In this field-cycling NMR relaxometry and fringe-field NMR diffusometry study, melts of linear polymers in ...
Nanoscopic poly(ethylene oxide) strands embedded in semi-interpenetrating methacrylate networks. Preparation method and quantitative characterization by field-gradient NMR diffusometry

Fischer E.; Beginn U.; Fatkullin N.; Kimmich R. (2004)

Networks of nanoscopic strands of linear, monodisperse poly(ethylene oxide) embedded in cross-linked methacrylate matrices were prepared. Depending on the choice of matrix constituents, the diameters of these strands can ...
Polymer dynamics under nanoscopic constraints: The "corset effect" as revealed by NMR relaxometry and diffusometry

Fatkullin N.; Fischer E.; Mattea C.; Beginn U.; Kimmich R. (2004)

A spinodal demixing technique was employed for the preparation of linear poly(ethylene oxide) (PEO) confined in nanoscopic strands, which in turn are embedded in a quasi-solid methacrylate matrix impenetrable to PEO. Both ...
Reptation in artificial tubes and the corset effect of confined polymer dynamics

Kimmich R.; Fatkullin N.; Fischer E.; Mattea C.; Beginn U. (2003)

A spinodal demixing technique was employed for the preparation of linear poly(ethylene oxide) (PEO) confined to nanoscopic strands which in turn are embedded in a quasi-solid and impenetrable methacrylate matrix. Both the ...
Segment diffusion in polymers confined in nanopores: A fringe-field NMR diffusometry study

Fischer E.; Kimmich R.; Beginn U.; Möller M.; Fatkullin N. (1999)

The dynamics of polymer chains confined in artificial tubes formed by the pores of a nanoporous material should display all the features predicted by the reptation model, provided that the polymer/wall interaction does not ...
The "corset effect" of spin-lattice relaxation in polymer melts confined in nanoporous media

Mattea C.; Fatkullin N.; Fischer E.; Beginn U.; Anoardo E.; Kroutieva M.; Kimmich R. (2004)

Linear polyethylene oxides with molecular weights Mw of 1665 and 10170 confined in pores with variable diameters in a solid methacrylate matrix were studied by proton field-cycling nuclear magnetic resonance relaxometry. ...
The confined-to-bulk dynamics transition of polymer melts in nanoscopic pores of solid matrices with varying pore diameter

Fatkullin N.; Kimmich R.; Fischer E.; Mattea C.; Beginn U.; Kroutieva M. (2004)

The confinement of polymer melts in nanoscopic pores leads to chain dynamics significantly different from bulk behaviour. This so-called 'corset effect' occurs both above and below the critical molecular mass and induces ...

Now showing items 1-9 of 9

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Browsing by Author "Beginn U."

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