High-Resolution 13C NMR Study of Liquid 2-Ethylhexyl Benzoate Confined to Porous Silica Glasses

1994 ◽  
Vol 98 (27) ◽  
pp. 6835-6839 ◽  
Author(s):  
Jing Zhang ◽  
Jiri Jonas
Keyword(s):  
High Resolution ◽  
13C Nmr ◽  
Porous Silica ◽  
Silica Glasses ◽  
Nmr Study

scholarly journals Curing Reactions of Bismaleimide Resins Catalyzed by Triphenylphosphine. High Resolution Solid-State 13C NMR Study

1996 ◽  
Vol 28 (9) ◽  
pp. 752-757 ◽  
Author(s):  
Sumio Shibahara ◽  
Takashi Enoki ◽  
Takahisa Yamamoto ◽  
Jiro Motoyoshiya ◽  
Sadao Hayashi
Keyword(s):  
Solid State ◽  
High Resolution ◽  
13C Nmr ◽  
Nmr Study ◽  
Bismaleimide Resins ◽  
Solid State 13C Nmr

13C NMR study of the mixture MBBA/EBBA/decane: The influence of decane on the molecular ordering in the nematic phase

1989 ◽  
Vol 54 (4) ◽  
pp. 868-877
Author(s):  
Josef Šebek ◽  
Raivo Teeaar
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Internal Rotation ◽  
13C Nmr ◽  
Nematic Phase ◽  
Temperature Behaviour ◽  
Nmr Study ◽  
Molecular Ordering ◽  
Conformational Order ◽  
C Nmr

Influence of various amounts of decane dissolved in the eutectic nematic mixture in methoxybenzylidenebutylaniline and ethoxybenzylidenebutylaniline (MBBA/EBBA) on the ordering and structure of mesomorphic molecules has been determined employing high-resolution proton enhanced 13C NMR spectroscopy. The obtained results are compared with temperature behaviour of the ordering and structure of EBBA studied by means of the same technique. Slight differences in the ordering of the phenyl parts of molecules in the dependence on temperature and on decane concentration have been observed. This contrasts with great differences observed in the behaviour of the butyl parts of mesogenic molecules. Two possible explanation of the behaviour of butyl chain atoms in the dependence on decane concentration are presented. According to one approach, conformational order parameters of the first butyl carbons increase with the increasing decane concentration. Another possibility is that decane increases the correlation between the whole molecule rotation and the internal rotation around the first butyl bond.

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