✦ LIBER ✦
Study of fluorinated blowing agents in polyurethane foams by fast magic angle spinning fluorine-19 NMR spectroscopy
✍ Scribed by Peter Jackson; Robert H. Carr
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 283 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Using magic angle spinning ^19^F NMR, it has been possible to identify gaseous chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) blowing agents trapped in the cells of test samples of polyurethane foam. On spinning the samples at rates greater than 10 kHz, further signals have been observed corresponding to rigidly held CFC and HCFC molecules absorbed in the solid polymer. Differences are seen between a sample taken from the centre of a foam block and a sample taken from the block edge, possibly indicating some localized decomposition of the blowing agent(s) within the solid polymer.