Silicon-29 magic-angle-spinning NMR characterization of silicon carbide polytypes

1987 ◽  
Vol 91 (20) ◽  
pp. 5361-5364 ◽  
Author(s):  
Jason R. Guth ◽  
William T. Petuskey
Keyword(s):  
Silicon Carbide ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Nmr Characterization ◽  
Angle Spinning

High-field boron-11 magic-angle spinning NMR characterization of boron nitrides

1991 ◽  
Vol 3 (3) ◽  
pp. 482-486 ◽  
Author(s):  
Paul S. Marchetti ◽  
Daekeun Kwon ◽  
Wayde R. Schmidt ◽  
Leonard V. Interrante ◽  
Gary E. Maciel
Keyword(s):  
High Field ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Boron Nitrides ◽  
Nmr Characterization ◽  
Angle Spinning

Solid State NMR Characterization of Crosslinked Brominated Poly(Isobutylene-co-4-Methylstyrene)

1993 ◽  
Vol 66 (1) ◽  
pp. 109-120 ◽  
Author(s):  
R. R. Eckman ◽  
I. J. Gardner ◽  
H-C. Wang
Keyword(s):  
Solid State ◽  
Functional Groups ◽  
Solid State Nmr ◽  
Phenyl Ring ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Crosslinked Polymers ◽  
Nmr Characterization ◽  
Angle Spinning

Abstract The curing of brominated poly(isobutylene-co-4-methylstyrene) was studied using solid-state magic-angle-spinning NMR, a technique which is uniquely suited to investigate cured or crosslinked polymers. This brominated copolymer contains 4-bromomethylstyryl and 4-methylstyryl functional groups and was compression cured with pure ZnO. It was proposed that a precomplex is formed between zinc and the 4-bromomethylstyryl group, which generates a benzylic carbocationic intermediate. Crosslinking predominantly occurs by alkylation of the phenyl ring of another 4-bromomethylstyryl group by the benzylic intermediate. The ZnO brings the two bromides of these groups into proximity. The dependence of the cure chemistry on the concentration of 4-bromomethylstyryl functional groups was studied. Conversion of some 4-bromomethylstyryl groups to oxygenated species upon curing was also observed.

A Cross-Polarization Magic-Angle Spinning 13C NMR Characterization of the Stable Solid-State Forms of Cimetidine

1997 ◽  
Vol 86 (12) ◽  
pp. 1400-1402 ◽  
Author(s):  
David A. Middleton ◽  
Cecile S. Le Duff ◽  
Frederic Berst ◽  
David G. Reid
Keyword(s):  
Solid State ◽  
13C Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Nmr Characterization ◽  
Angle Spinning
Sign in / Sign up

Export Citation Format

Share Document