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Browsing by Author "Fatkullin N."

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A simple scaling derivation of the shear thinning power-law exponent in entangled polymer melts

Fatkullin N.; Mattea C.; Stapf S. (2011)

By suggesting that the polymer dynamics in entangled polymer melts possesses the property of dynamical self-similarity, we argue that the power-law exponent of the Carreau-Yasuda law, which empirically describes the shear ...
All Polymer Diffusion Regimes Covered by Combining Field-Cycling and Field-Gradient 1H NMR

Kresse B.; Hofmann M.; Privalov A.; Fatkullin N.; Fujara F.; Rössler E. (2015)

© 2015 American Chemical Society. Field-cycling and field-gradient 1H NMR experiments were combined to reveal the segmental mean-square displacement as a function of time for polydimethylsiloxane (PDMS) and ...
Anisotropy of the segment mobility versus self-and pair-Correlation functions in polymer melts under mesoscopic confinement

Kimmich R.; Fatkullin N. (2010)

Techniques typically used for studies of polymer dynamics such as NMR relaxometry, quasielastic neutron scattering, multiple-quantum build-up NMR, dielectric relaxation spectroscopy, and mechanical relaxation are specified ...
Chain dynamics in entangled polymers: Power laws of the proton and deuteron spin-lattice relaxation dispersions

Kimmich R.; Fatkullin N.; Seitter R.; Gille K. (1998)

Chain modes of entangled polymer melts can directly be probed in a frequency range 102 Hz <v<108 Hz with the aid of field-cycling proton or deuteron relaxometry. The frequency dispersion of proton spin-lattice relaxation ...
Chain dynamics in mesoscopically confined polymer melts. A field-cycling NMR relaxometry study

Kausik R.; Mattea C.; Kimmich R.; Fatkullin N. (2007)

Polymer chain dynamics were studied with the aid offield-cycling NMR relaxometry (time scale: 10-9s⋯10-4s) supplemented by field gradient NMR diffusometry( time scale: 10-4s⋯100s). Three sorts of samples of mesoscopically ...
Communication: Proton NMR dipolar-correlation effect as a method for investigating segmental diffusion in polymer melts

Lozovoi A.; Mattea C.; Herrmann A.; Rössler E.; Stapf S.; Fatkullin N. (2016)

© 2016 Author(s).A simple and fast method for the investigation of segmental diffusion in high molar mass polymer melts is presented. The method is based on a special function, called proton dipolar-correlation build-up ...
Computer-aided simulation of the influence of collective effects on polymer-melt dynamics in a straight cylindrical tube: Observation of the onset stage of the corset effect

Shakirov T.; Fatkullin N.; Khalatur P.; Stapf S.; Kimmich R. (2012)

The results of the computer-aided simulation of the dynamics of a polymer melt consisting of Fraenkel chains in straight cylindrical tubes and in bulk are discussed. Two different models are studied. In the first model, ...
Concentration dependence of the coefficient of self-diffusion of macromolecules in polymer solutions

Skirda V.; Fatkullin N.; Sundukov V.; Maklakov A. (1987)

The NMR method with the pulse gradient of the magnetic field has been used to study 3he self-diffusion of macromolecules of PEO (Mn = 2×103-3×106) and PS (Mn = 2·4×105; 1·3×106) in different solvents over a wide range of ...
Confinement effect of chain dynamics in micrometer thick layers of a polymer melt below the critical molecular weight

Kausik R.; Mattea C.; Fatkullin N.; Kimmich R. (2006)

Polymer melts confined in micrometer thick layers were examined with the aid of field-cycling NMR relaxometry. It is shown that chain dynamics under such moderate confinement conditions are perceptibly different from those ...
Cooperative polymer dynamics under nanoscopic pore confinements probed by field-cycling NMR relaxometry

Fatkullin N.; Kausik R.; Kimmich R. (2007)

Reptational dynamics of bulk polymer chains on a time scale between the Rouse mode relaxation time and the so-called disengagement time is not compatible with the basic thermodynamic law of fluctuations of the number of ...
Deuteron and proton spin-lattice relaxation dispersion of polymer melts: Intrasegment, intrachain, and interchain contributions

Kehr M.; Fatkullin N.; Kimmich R. (2007)

Proton and deuteron field-cycling NMR relaxometry was applied to deuterated and undeuterated bulk polyethyleneoxide and polybutadiene melts and mixtures thereof with molecular weights above the critical value. Spin-lattice ...
Diffusion spin echo decay by pulsed magnetic field gradient NMR and some structure features in blockcopolymer solutions

Grinberg F.; Scirda V.; Fatkullin N.; Maklakov A.; Rogovina L.; Storogyk I. (1985)

Blockcopolymer solutions were investigated by pulsed field gradient NMR. Nonexponential diffusion decay of solvent molecules and the dependence of it's shape on time of observation uere found out. These features (unusual ...
Dynamics of a paradigmatic linear polymer: A proton field-cycling NMR relaxometry study on poly(ethylene-propylene)

Hofmann M.; Kresse B.; Heymann L.; Privalov A.; Willner L.; Fatkullin N.; Aksel N.; Fujara F.; Rössler E. (2016)

© 2016 American Chemical Society.The dynamics of melts of linear poly(ethylene-alt-propylene) (PEP) of different molar masses (M) is investigated by 1H field-cycling (FC) NMR relaxometry. Employing a commercial and a ...
Dynamics of PPI dendrimers: A study by dielectric and 2H NMR spectroscopy and by field-cycling 1H NMR relaxometry

Mohamed F.; Hofmann M.; Pötzschner B.; Fatkullin N.; Rössler E. (2015)

© 2015 American Chemical Society. We investigate bulk poly(propyleneimine) dendrimers of generation (G) 2-5 by dielectric spectroscopy (DS), solid-state 2H NMR, and field-cycling 1H NMR relaxometry ...
Features of polymer chain dynamics as revealed by intermolecular nuclear magnetic dipole-dipole interaction: Model calculations and field-cycling NMR relaxometry

Fatkullin N.; Gubaidullin A.; Stapf S. (2010)

Proton NMR phenomena such as spin-lattice relaxation, free-induction decays, and solid echoes are analyzed with respect to contributions by intermolecular dipole-dipole interactions in polymer melts. The intermolecular ...
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-cycling NMR relaxometry probing the microscopic dynamics in polymer melts

Hofmann M.; Kresse B.; Privalov A.; Willner L.; Fatkullin N.; Fujara F.; Rössler E. (2014)

© 2014 American Chemical Society. Field-cycling (FC) 1H and 2H NMR relaxometry is applied to linear polybutadiene (PB) of different molar mass (M) in order to test current polymer theories. Applying earth field compensation, ...
Field-cycling nuclear magnetic resonance relaxometry of thermoreversible polybutadiene networks

Kimmich R.; Gille K.; Fatkullin N.; Seitter R.; Hafner S.; Müller M. (1997)

Chain dynamics in thermoreversible polybutadiene networks were studied in comparison to linear polybutadiene using field-cycling NMR (nuclear magnetic resonance) relaxometry. The effect of rapidly fluctuating cross links ...
Field-Cycling Relaxometry as a Molecular Rheology Technique: Common Analysis of NMR, Shear Modulus and Dielectric Loss Data of Polymers vs Dendrimers

Hofmann M.; Gainaru C.; Cetinkaya B.; Valiullin R.; Fatkullin N.; Rössler E. (2015)

© 2015 American Chemical Society. Linear poly(propylene glycol) (PPG) as well as a poly(propyleneimine) (PPI) dendrimer with different molar masses (M) are investigated by field-cycling (FC) 1H NMR, shear rheology (G) and ...
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 ...

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Browsing by Author "Fatkullin N."

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