Charcterization of polymer blends by selective proton spin-diffusion NMR measurements

1986 ◽  
Vol 19 (7) ◽  
pp. 1889-1895 ◽  
Author(s):  
P. Caravatti ◽  
P. Neuenschwander ◽  
R. R. Ernst
Keyword(s):  
Polymer Blends ◽  
Spin Diffusion ◽  
Proton Spin ◽  
Diffusion Nmr

Characterization of heterogeneous polymer blends by two-dimensional proton spin diffusion spectroscopy

1985 ◽  
Vol 18 (1) ◽  
pp. 119-122 ◽  
Author(s):  
P. Caravatti ◽  
P. Neuenschwander ◽  
R. R. Ernst
Keyword(s):  
Polymer Blends ◽  
Spin Diffusion ◽  
Proton Spin ◽  
Two Dimensional ◽  
Heterogeneous Polymer

Two-Dimensional Spin-Diffusion NMR Reveals Differential Mixing in Biodegradable Polymer Blends

2005 ◽  
Vol 38 (7) ◽  
pp. 2775-2780 ◽  
Author(s):  
Xin Jia ◽  
Xingwu Wang ◽  
A. E. Tonelli ◽  
Jeffery L. White
Keyword(s):  
Polymer Blends ◽  
Biodegradable Polymer ◽  
Spin Diffusion ◽  
Two Dimensional ◽  
Diffusion Nmr

Proton Spin Diffusion Studies of Polymer Blends Having Modest Monomer Size. 2. Blends of Cellulose with either Poly(acrylonitrile) or Poly(4-vinylpyridine)

1994 ◽  
Vol 27 (10) ◽  
pp. 2826-2836 ◽  
Author(s):  
D. L. Vanderhart ◽  
R. St. John Manley ◽  
J. D. Barnes
Keyword(s):  
Polymer Blends ◽  
Spin Diffusion ◽  
Proton Spin ◽  
Diffusion Studies ◽  
Poly Acrylonitrile

Proton spin diffusion as a tool for characterizing polymer blends

1990 ◽  
Vol 34 (1) ◽  
pp. 125-159 ◽  
Author(s):  
D. L. VanderHart
Keyword(s):  
Polymer Blends ◽  
Spin Diffusion ◽  
Proton Spin

Segmental dynamic heterogeneity of short-chain grafted-poly(dimethylsiloxane) by 1H spin-diffusion NMR

2006 ◽  
Vol 431 (4-6) ◽  
pp. 404-409 ◽  
Author(s):  
Marko Bertmer ◽  
Dan E. Demco ◽  
Mingfei Wang ◽  
Claudiu Melian ◽  
Ramona I. Marcean-Chelcea ◽  
...  
Keyword(s):  
Spin Diffusion ◽  
Short Chain ◽  
Dynamic Heterogeneity ◽  
Diffusion Nmr ◽  
Segmental Dynamic

Determination of Peptide Oligomerization in Lipid Bilayers Using19F Spin Diffusion NMR

2005 ◽  
Vol 127 (12) ◽  
pp. 4477-4483 ◽  
Author(s):  
Jarrod J. Buffy ◽  
Alan J. Waring ◽  
Mei Hong
Keyword(s):  
Lipid Bilayers ◽  
Spin Diffusion ◽  
Diffusion Nmr

scholarly journals CP MAS kinetics and impedance spectroscopy studies of local disorder in low-dimensional H-bonded proton-conducting materials

2019 ◽  
Vol 59 (3) ◽  
Author(s):  
Laurynas Dagys ◽  
Sergejus Balčiūnas ◽  
Jûras Banys ◽  
Feliksas Kuliešius ◽  
Vladimir Chizhik ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Spin Diffusion ◽  
Lattice Relaxation ◽  
Magic Angle Spinning ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Magic Angle ◽  
Coupling Constant ◽  
Spin Lattice ◽  
Local Disorder

The 1H–13C cross-polarization magic angle spinning (CP MAS) kinetics was studied in poly(vinyl phosphonic acid) (pVPA), i.e. material with high degrees of freedom of proton motion along H-bonded chains. It has been shown that the CP kinetic data for the adjacent 1H–13C spin pairs can be described in the frame of the isotropic spin-diffusion approach. The rates of spin diffusion and spin-lattice relaxation as well as the parameters accounting for spin coupling and the effective size of spin clusters have been determined. The local order parameter S ≈ 0.63±0.02, determined as the ratio of the measured dipolar 1H–13C coupling constant and the calculated static dipolar coupling constant, is significantly lower than the values deduced for related sites in other polymers and in series of amino acids. This means that the local disorder of the C–H bonds in pVPA is between those for rather rigid C–H bond configurations having S = 0.8–1.0 and highly disordered –CH3 groups (S ~ 0.4). This effect can be attributed to the presence of the proton transfer path where proton motion is easy to activate. The activation energy for the proton motion Ea = 59±7 kJ/mol was determined from the impedance spectroscopy data analysing the temperature and frequency dependences of the complex dielectric permittivity of pVPA. The rates of proton spin-lattice relaxation and spin diffusion are of the same order and both run in the time scale of milliseconds.

Domain Size Determination of Poly(phthalamide)/Poly(dimethylsiloxane) Block Copolymers by1H Solid-State Spin Diffusion NMR Spectroscopy

2008 ◽  
pp. 339-343
Author(s):  
Axel Kretschmer ◽  
Robert A. Drake ◽  
Simeon J. Bones ◽  
Michael Neidhoefer ◽  
Manfred Wilhelm ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Block Copolymers ◽  
Spin Diffusion ◽  
Domain Size ◽  
Size Determination ◽  
Diffusion Nmr ◽  
State Spin
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