𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A 13C NMR Study of the Products and Mechanism of the Thermal Oxidative Degradation of Poly(ethylene oxide)

✍ Scribed by Omar A. Mkhatresh; Frank Heatley

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
133 KB
Volume
203
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The products and mechanism of the thermal oxidative degradation of poly(ethylene oxide) at 150 °C have been analysed using ^13^C NMR spectroscopy. The analysis was assisted by the use of distortionless enhancement by polarisation transfer spectra, longitudinal relaxation time measurements, long‐range ^13^C^1^H coupling and chemical shift simulation software. The major result of degradation was chain scission resulting in two formate ester chain ends. Minor products were in‐chain esters, peroxy groups, oxymethylene links and hydroxy and methoxy chain ends.
Initial steps for the mechanism of chain scission.

magnified imageInitial steps for the mechanism of chain scission.

📜 SIMILAR VOLUMES

Thermal and microwave-assisted oxidative
Thermal and microwave-assisted oxidative degradation of poly(ethylene oxide)
✍ S. P. Vijayalakshmi; J. Chakraborty; Giridhar Madras 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 117 KB 👁 2 views

## Abstract The kinetics of the thermal and microwave‐assisted oxidative degradation of poly(ethylene oxide) were determined with potassium persulfate as the oxidizing agent. Gel permeation chromatography was used to determine the variation of the molecular weight with time. The degradation was stu

The structure of poly(ethylene oxide)-sa
The structure of poly(ethylene oxide)-salt complexes with 13c CPMAS NMR and relaxation studies
✍ Sirkka L. Maunu; Kari Soljamo; Matti Laanterä; Franciska Sundholm 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 478 KB

## Abstract ^13^C cross polarization and magic‐angle spinning (CPMAS) NMR studies were made on poly(ethylene oxide) (PEO) complexed wit LiClO~4~, NaClO~4~, BaSCN, Bal~2~ and Ba(ClO~4~)~2~. The proton and carbon spin‐lattice relaxation times in a rotating frame (__T__~1ρH~, __T__~1ρC~) as well as th

Oxidation of Palmitoyl- and Benzoylascor
Oxidation of Palmitoyl- and Benzoylascorbate. — A13C-NMR Study
✍ Berger, Stefan ;Otten, Martina G. ;Steinbach, Klaus 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 308 KB

## Abstract Ascorbic acid (1a), the 6‐benzoate and 6‐palmitate ester (1b, c) were oxidized by iodine both in D~2~O and in [D~6~]DMSO solution. The reactions were followed by ^13^C‐NMR spectroscopy. It was shown for the 6‐esters 1b, c, that, with the exclusion of water, monomeric dehydroascorbic aci

A NOESY NMR Study of the Interaction bet
A NOESY NMR Study of the Interaction between Sodium Dodecyl Sulfate and Poly(Ethylene Oxide)
✍ Magne Ivar Gjerde; Willy Nerdal; Harald Høiland 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 70 KB

NOTE A NOESY NMR Study of the Interaction between Sodium Dodecyl Sulfate and Poly(Ethylene Oxide) carbon part of a water / SDS liquid crystal system has been addressed by Kekicheff et al. ( 10 ) . They found from neutron scattering studies that The system poly(ethylene oxide) (PEO) and sodium dodecy