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Study of fluorinated blowing agents in polyurethane foams by fast magic angle spinning fluorine‐19 NMR spectroscopy
Author(s) -
Jackson Peter,
Carr Robert H.
Publication year - 1991
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260291015
Subject(s) - polyurethane , magic angle spinning , chemistry , spinning , blowing agent , polymer , nuclear magnetic resonance spectroscopy , polymer chemistry , composite material , materials science , organic chemistry
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.