Dynamic-mechanical properties and cross-polarized, proton-enhanced, magic-angle spinning 13C-NMR time constants of urethane acrylates—2. Copolymer networks

1994 ◽  
Vol 30 (4) ◽  
pp. 427-432 ◽  
Author(s):  
P.E.M Allen ◽  
A.B Clayton ◽  
D.R.G Williams
Keyword(s):  
Mechanical Properties ◽  
13C Nmr ◽  
Dynamic Mechanical Properties ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Time Constants ◽  
Dynamic Mechanical ◽  
Polarized Proton ◽  
Angle Spinning

Solid State 13C NMR Applied to Styrene-Butadiene Rubbers Study of the Rubber Vulcanized Network Structures

2002 ◽  
Vol 75 (1) ◽  
pp. 65-76 ◽  
Author(s):  
L. Pellicioli ◽  
S. K. Mowdood ◽  
F. Negroni ◽  
D. D. Parker ◽  
J. L. Koenig
Keyword(s):  
13C Nmr ◽  
Structural Changes ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Nmr Spectrum ◽  
Polymer Microstructure ◽  
Polybutadiene Rubber ◽  
Angle Spinning ◽  
Styrene Butadiene

Abstract This paper discusses the structural changes that occur during the accelerated sulfur vulcanization of styrene-butadiene rubbers (SBR) through characterization of the network sulfide structures influenced by the curing agent concentration, the polymer microstructure, and the nature of the filler. Magic angle spinning (MAS) 13C FT - NMR spectroscopy was used to investigate the chemical crosslink properties of unfilled vulcanized SBR in addition to carbon black and silica filled polybutadiene rubber (BR), SBR, and 1:1 BR / SBR blends. New resonances in the 13C NMR spectrum are assigned to the various sulfide crosslink structures in SBR. Structural changes during vulcanization are also discussed.

A magic angle spinning 13C NMR study of 13CO-labelled tricarbonyl(hexahapto-hexamethylbenzene)chromium(0) and tricarbonyl(hexahapto-durene)chromium(0)

Polyhedron ◽  
1995 ◽  
Vol 14 (19) ◽  
pp. 2691-2696
Author(s):  
John A. Chudek ◽  
Geoffrey Hunter ◽  
John D. Paton ◽  
Barbara A. Walmsley
Keyword(s):  
13C Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Nmr Study ◽  
Angle Spinning
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