scholarly journals Investigating Chain Dynamics in Highly Crosslinked Polymers using Solid‐State 1 H NMR Spectroscopy

2019 ◽  
Vol 57 (17) ◽  
pp. 1143-1156 ◽  
Author(s):  
Todd M. Alam ◽  
Brad H. Jones
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Crosslinked Polymers ◽  
Chain Dynamics ◽  
H Nmr ◽  
State 1

Insights into asphaltene aggregate structure using ultrafast MAS solid-state 1 H NMR spectroscopy

Fuel ◽  
2017 ◽  
Vol 193 ◽  
pp. 359-368 ◽  
Author(s):  
R. Dutta Majumdar ◽  
T. Montina ◽  
O.C. Mullins ◽  
M. Gerken ◽  
P. Hazendonk
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Aggregate Structure ◽  
H Nmr ◽  
State 1

Investigation of the disorder of dibromo- and dichloromethane in their tri-ortho-thymotide clathrates using X-ray diffraction and solid-state 2H NMR spectroscopy

2011 ◽  
Vol 89 (7) ◽  
pp. 854-862
Author(s):  
Glenn A. Facey ◽  
Ilia Korobkov
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Guest Molecule ◽  
Type B ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Twofold Axis ◽  
H Nmr ◽  
Heavy Atoms

The tri-ortho-thymotide (TOT) clathrates of dibromo- and dichloromethane were characterized by single crystal X-ray diffraction at 200 K and solid-state 2H NMR spectroscopy as a function of temperature. The host structure was found to be typical of other cage-type TOT clathrates. The X-ray results showed a substantial amount of disorder among the guest molecules. In both clathrates, multiple guest molecule positions could be modeled. The heavy atoms of all the guest molecule positions lie approximately in the same plane, with some out-of-plane distortion. The guest molecules were of two different types in positions symmetric about the crystallographic twofold rotation axis: type A guests, with carbon atoms well removed from the crystallographic twofold axis, and type B guests, with carbon atoms very close to the twofold axis. The 2H NMR spectra for the guests confirmed that the disorder was dynamic. The experimental results could be accounted for by the presence of three simultaneous types of molecular motion, all fast with respect to the 2H quadrupolar interaction: (i) twofold molecular flips about the molecular C2 symmetry axis, (ii) exchange between the type A and type B sites in a single plane, and (iii) a two-site libration of the plane containing the heavy atoms of the A and B guest sites with a temperature-dependent amplitude.

Sila-Pharmaka, 26. Mitt. [1]. Darstellung und Eigenschaften potentiell curarewirksamer Silicium-Verbindungen, III / Sila-Pharmaca, 26th Communication [1]. Preparation and Properties of Silicon Compounds with Potential Curare-Like Activity, III

1982 ◽  
Vol 37 (11) ◽  
pp. 1461-1471 ◽  
Author(s):  
Reinhold Tacke ◽  
Haryanto Linoh ◽  
Moayad T. Attar-Bashi ◽  
William S. Sheldrick ◽  
Ludger Ernst ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Neuromuscular Blocking ◽  
Neuromuscular Blocking Agents ◽  
X Ray Diffraction ◽  
Silicon Compounds ◽  
X Ray ◽  
Structure Activity Relationships ◽  
H Nmr ◽  
Structure Activity

The potentially curare-like silicon compounds 8a-8f wore synthesized and investigated with respect to their structure-activity relationships. The conformations of the com­pounds in the solid state and in solution were studied by X-ray diffraction analysis (8a-8e) and 1H NMR spectroscopy (8a-8f), respectively. The muscle relaxing properties of 8a-8f were investigated on the mouse. The observed structure-activity relationships are not in accordance with the classical “14 Å model” for neuromuscular blocking agents.

Poly(vinylamine-co-N-isopropylacrylamide) linear polymer and hydrogels with tuned thermoresponsivity

Soft Matter ◽  
2020 ◽  
Vol 16 (28) ◽  
pp. 6549-6562 ◽  
Author(s):  
Thorsten Fischer ◽  
Dan E. Demco ◽  
Radu Fechete ◽  
Martin Möller ◽  
Smriti Singh
Keyword(s):  
Nmr Spectroscopy ◽  
Linear Polymer ◽  
Linear Polymers ◽  
Chain Dynamics ◽  
H Nmr

Poly(vinylamine-co-N-isopropylacrylamide) linear polymers and hydrogels with tuned thermoresponsivity have been synthetized. They morphology and chain dynamics where investigated by rheology and 1H NMR spectroscopy, relaxometry and diffusometry.

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