Solid State NMR Relaxation Study of Liquid Crystal Polymers Employing a Two-Dimensional Technique

1991 ◽  
pp. 261-270
Author(s):  
A. Schleicher ◽  
K. Müller ◽  
G. Kothe
Keyword(s):  
Liquid Crystal ◽  
Solid State ◽  
Solid State Nmr ◽  
Nmr Relaxation ◽  
Liquid Crystal Polymers ◽  
Two Dimensional ◽  
Relaxation Study

scholarly journals High-Resolution Structural Insights into Bone: A Solid-State NMR Relaxation Study Utilizing Paramagnetic Doping

2012 ◽  
Vol 116 (38) ◽  
pp. 11656-11661 ◽  
Author(s):  
Kamal H. Mroue ◽  
Neil MacKinnon ◽  
Jiadi Xu ◽  
Peizhi Zhu ◽  
Erin McNerny ◽  
...  
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Solid State Nmr ◽  
Nmr Relaxation ◽  
Relaxation Study ◽  
Structural Insights

Characterization of some mesogenic alkyl 1-thioglycosides

2002 ◽  
Vol 80 (8) ◽  
pp. 1162-1165 ◽  
Author(s):  
B Henrissat ◽  
G K Hamer ◽  
M G Taylor ◽  
R H Marchessault
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Solid State ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
Liquid Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Crystalline Phases

A series of dodecyl 1-thio-β-D-glycosides has been synthesized and characterized (DSC, NMR, CP MAS, X-ray diffraction) as possible new marking materials with liquid-crystalline properties. These compounds undergo solid to liquid crystal phase transitions at various temperatures, which depend on the nature of the carbohydrate part of the structure. Their liquid-crystalline phases show extreme shear thinning behaviour.Key words: liquid crystal, powder X-ray diffraction, phase transition, thioglycoside, solid-state NMR, marking material

Study of Polyethylene by Solid State NMR Relaxation and Spin Diffusion

1997 ◽  
Vol 30 (8) ◽  
pp. 2474-2481 ◽  
Author(s):  
R. R. Eckman ◽  
P. M. Henrichs ◽  
A. J. Peacock
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Spin Diffusion ◽  
Nmr Relaxation

Molecular Motion Analysis of 5CB in PDLCs Using Solid-State 13C NMR Relaxation Spectroscopy

1993 ◽  
Vol 47 (7) ◽  
pp. 933-941 ◽  
Author(s):  
Karen L. Buchert ◽  
Jack L. Koenig ◽  
Shi-Qing Wang ◽  
John L. West
Keyword(s):  
Liquid Crystal ◽  
Solid State ◽  
Polymer Matrix ◽  
Nmr Relaxation ◽  
Domain Size ◽  
Chemical Structures ◽  
Similar Chemical ◽  
Polymer Dispersed ◽  
Submicron Droplets ◽  
Significant Change

In samples of polymer-dispersed liquid crystals (PDLCs), submicron droplets of liquid crystal reside within a polymer matrix. By the use of the cross polarization technique for solid-state 13C NMR spectroscopy, the NMR spectrum of the liquid crystal can be obtained without interference from the polymer spectrum, even though the two materials have some similar chemical structures. Both 13C T1 and 13C T1 ρ relaxation experiments were performed on a PDLC system of 5CB in epoxy as a function of 5CB domain size. The 13C T1 relaxation constants and the localized motions they measure showed no significant change over the liquid crystal domain size studied. However, the 13C T1 ρ relaxation constants and the segmental motions of molecules they measure revealed a significant change over the liquid crystal domain size studied. Therefore, the 13C T1 ρ values can be used to determine the change in mobility of the molecular segments of the SCB molecules resulting from increased interaction between the liquid crystal and the polymer matrix and to further understand the importance of the molecular motions of the liquid crystal in the switching phenomenon for PDLC materials.

Sign in / Sign up

Export Citation Format

Share Document