𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The structure of poly(ethylene oxide)-salt complexes with 13c CPMAS NMR and relaxation studies

✍ Scribed by Sirkka L. Maunu; Kari Soljamo; Matti Laanterä; Franciska Sundholm

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
478 KB
Volume
195
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

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 the rate of cross polarization were measured at room temperature. For Ba(ClO~4~)~2~ the measurements were made with different polymer molar masses and salt concentrations. The changes in relaxation behaviour indicate changes in polymer chain mobility as well as strong interaction between ions and PEO chains. The T~1ρH~ and T~1ρC~ decrease with decreasing salt concentration towards the relaxation times of the pure polymer. Nonexponential relaxation behaviour was found for the samples according to the T~1ρC~ and T~CH~ measurements.

📜 SIMILAR VOLUMES

A 13C NMR Study of the Products and Mech
A 13C NMR Study of the Products and Mechanism of the Thermal Oxidative Degradation of Poly(ethylene oxide)
✍ Omar A. Mkhatresh; Frank Heatley 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 133 KB

## 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 measuremen

1H and 13C NMR studies of the proton tra
1H and 13C NMR studies of the proton transfer in complexes of substituted phenols with trimethylamine N-oxide
✍ Bogumil Brycki; Bogumil Brzezinski; Georg Zundel; Thomas Keil 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 309 KB

## Abstract Substituted phenol–trimethylamine __N__‐oxide (TMAO) systems were studied. The ^1^H chemical shift of the hydrogen‐bonded proton first increases with decreasing p__K__~a~ of the phenols and, after a sharp maximum, it then decreases. Thus, the shielding of the hydrogen‐bonded proton by t

1H and 13C NMR study of the adsorption o
1H and 13C NMR study of the adsorption of alcohols on charcoals with various pore structures
✍ You-Ru Du; Han-Zhen Yuan; Dong-Hui Wu; Yu-Hua Kong 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 362 KB 👁 1 views

A 'H NMR study of methyl, ethyl, n-propyl, isopropyl and allyl alcohols adsorbed on charcoals with various pore structures showed that the adsorption mechanism is by capillary condensation in pores with radii smaller than Mdi, and by mono-/multi-layer adsorption on the solid surface of pores with la

The structure of 2-carboxyphenyl methyl
The structure of 2-carboxyphenyl methyl selenoxide, its sodium salt and related compounds in solution, studied by 1H, 13C and 77Se NMR
✍ Warö Nakanishi; Yoshitsugu Ikeda; Hiizu Iwamura 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 496 KB 👁 1 views

## Abstract ^1^H, ^13^C and ^77^Se NMR spectra of 2‐carboxyphenyl methyl selenoxides, 2‐carboxyphenyl phenyl selenoxides, their sodium salts and related compounds have been measured to determine their structures in solution. The ^77^Se NMR chemical shifts and the __J__(^77^Se, ^13^C) values were fo