𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The effect of crosslinking in elastomers investigated by NMR analysis of 13C edited transverse 1H NMR relaxation

✍ Scribed by Carsten Fülber; Dan E. Demco; Ofer Weintraub; Bernhard Blümich

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
606 KB
Volume
197
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The transverse nuclear ^1^H magnetization decay in poly(styrene‐co‐butadiene) (SBR) is investigated by editing ^13^C NMR spectra. This technique allows for the assignment of localized ^1^H dynamical information by discriminating the chemical sites based on their chemical shift in the ^13^C dimension. Here, the homo‐ and heteronuclear dipolar couplings contribute to the ^1^H NMR relaxation giving additional information to a homonuclear experiment. In this heteronuclear 2D experiment two prominent peaks are observed in the ^13^C dimension, which correspond to CH and CH~2~ groups, respectively. The decay rate in the ^1^H dimension is found for both groups to scale with the crosslink density. An additional ultra‐fast magnetization decay is reported. The effect of the carbon black filler is investigated for this component. The analysis of the ^13^C NMR edited transverse ^1^H magnetization relaxation is a useful tool in combining high resolution NMR spectra with information on molecular dynamics, providing insight into crosslink density and filler effects.

📜 SIMILAR VOLUMES

1H and 13C NMR relaxation investigation
1H and 13C NMR relaxation investigation of methotrexate in [2H6]dimethyl sulphoxide solution
✍ Elena Gaggelli; Gianni Valensin; Antonio Vivi; Antonella Macotta 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 298 KB

## Abstract ^1^H and ^13^C NMR parameters of methotrexate in [^2^H~6~]dimethyl sulphoxide were obtained and analysed in terms of a ‘preferred’ conformation. The effective correlation time of the anisotropic motion of the pteridinylbenzoyl moiety was evaluated as __ca__. 10 ns at 300 K. The ^1^H^1^

Investigation of substituent effects on
Investigation of substituent effects on the 1H and 13C NMR spectra of ferrocene analogues of chalcones
✍ E. Solčániová; S. Toma; A. Fiedlerová 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 414 KB 👁 1 views

## Abstract The transmission of electronic effects across the ferrocene analogues of chalcones [3‐aryl‐1‐ferrocenyl‐2‐propene‐1‐ones (series 1) and 1‐aryl‐3‐ferrocenyl‐2‐propene‐1‐ones (series 2)], as well as the conformations of both types of ferrocene analogues have been studied. The ferrocene an

Reorientational dynamics and internal mo
Reorientational dynamics and internal mobility of [Lys8]-vasopressins by analysis of 13C, 15N and 1H NMR relaxation
✍ G. Zieger; H. Sterk 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 474 KB

## Abstract The dynamic behaviour of [Lys^8^]‐vasopressin derivatives, especially of __N__‐Gly‐Gly‐Gly‐[Lys^8^]‐vasopressin in solution, was investigated by NMR relaxation studies. One can derive a set of dynamics data which describe the molecular tumbling in solution from ^13^C spin–lattice relaxa

An1H–13C–13C-Edited1H NMR Experiment for
An1H–13C–13C-Edited1H NMR Experiment for Making Resonance Assignments in the Active Site of Heme Proteins
✍ Feng Qiu; Mario Rivera; Ruth E. Stark 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 159 KB

In paramagnetic heme proteins, it is often problematic to make the reduced (usually diamagnetic) state lack isotropic shifts proton resonance assignments for heme substituents that do not and are therefore difficult to examine by NMR spectroscopy. have large isotropic shifts and consequently lie und