Chain dynamics in entangled polymers: Power laws of the proton and deuteron spin-lattice relaxation dispersions

1998 ◽  
Vol 108 (5) ◽  
pp. 2173-2177 ◽  
Author(s):  
R. Kimmich ◽  
N. Fatkullin ◽  
R.-O. Seitter ◽  
K. Gille
Keyword(s):  
Power Laws ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Chain Dynamics ◽  
Spin Lattice ◽  
Entangled Polymers ◽  
Deuteron Spin

Deuteron spin-lattice relaxation for HD in solid argon

1993 ◽  
Vol 47 (5) ◽  
pp. 2581-2589 ◽  
Author(s):  
Joseph Ganem ◽  
Peter A. Fedders ◽  
R. E. Norberg
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Deuteron Spin ◽  
Solid Argon

Deuteron spin-lattice relaxation in solid SnD4

1973 ◽  
Vol 43 (4) ◽  
pp. 343-344 ◽  
Author(s):  
L. Niemela ◽  
J. Mäkelä
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Deuteron Spin

A proton and deuteron spin–lattice relaxation study of the partially deuterated nematogens PAA and MBBA

1977 ◽  
Vol 66 (8) ◽  
pp. 3343-3346 ◽  
Author(s):  
J. J. Visintainer ◽  
Ronald Y. Dong ◽  
E. Bock ◽  
E. Tomchuk ◽  
David B. Dewey ◽  
...  
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Relaxation Study ◽  
Deuteron Spin

Reptation in Artificial Tubes and the Corset Effect of Confined Polymer Dynamics

2003 ◽  
Vol 790 ◽  
Author(s):  
Rainer Kimmich ◽  
Nail Fatkullin ◽  
Elmar Fischer ◽  
Carlos Mattea ◽  
Uwe Beginn
Keyword(s):  
Time Scale ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Radius Of Gyration ◽  
Chain Dynamics ◽  
Spin Lattice ◽  
The Matrix ◽  
The Mean ◽  
Nmr Diffusometry

ABSTRACTA 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 molecular weight of the PEO and the mean diameter of the strands are variable to a certain degree. Chain dynamics of the PEO in the molten state was examined with the aid of field-gradient NMR diffusometry (time scale: 10−2 s … 100 s) and field-cycling NMR relaxometry (time scale: 10−9 s … 10−4 s). The dominating mechanism for translational displacements probed in the nanoscopic strands by either technique is shown to be reptation. A corresponding evaluation formalism for NMR diffusometry is presented. It permits the estimation of the mean PEO strand diameter. Depending on the chemical composition of the matrix, the diameters range from 9 to 58 nm. The strands were visualized by electron microscopy. On the time scale of spin-lattice relaxation time measurements, the frequency dependence signature of reptation, that is T1 ∝ ν3/4, showed up in all samples. A “tube” diameter of only 0.6 nm was concluded to be effective on this time scale even when the strand diameter was larger than the radius of gyration of the PEO random coils. This “corset effect” is traced back to the lack of the local fluctuation capacity of the free volume in nanoscopic confinements. The confinement dimension is estimated at which the cross-over from “confined” to “bulk” chain dynamics is expected.

Deuteron spin-lattice relaxation in (ND4)2SnCl6 below 60 K

1990 ◽  
Vol 162 (3) ◽  
pp. 281-292 ◽  
Author(s):  
L.P. Ingman ◽  
E. Koivula ◽  
M. Punkkinen ◽  
E.E. Ylinen ◽  
Z.T. Lalowicz
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Deuteron Spin

Deuteron spin-lattice relaxation in partly and fully deuterated

2008 ◽  
Vol 34 (1-2) ◽  
pp. 77-85 ◽  
Author(s):  
A. Birczyński ◽  
E.E. Ylinen ◽  
M. Punkkinen ◽  
A.M. Szymocha ◽  
Z.T. Lalowicz
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Deuteron Spin

Deuteron spin lattice relaxation in amorphous ices

2006 ◽  
Vol 124 (22) ◽  
pp. 224503 ◽  
Author(s):  
M. Scheuermann ◽  
B. Geil ◽  
K. Winkel ◽  
F. Fujara
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Amorphous Ices ◽  
Deuteron Spin
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