Supercritical fluid extraction of nylon 6,6 oligomers and their characterization via liquid chromatography coupled with mass spectrometry

This research extends previous studies regarding the application of supercr itical fluid extraction (SFE) for the analysis of oligomers from nylon 6,6 fibers. The effects of CO2 pressure, extraction temperature, CO2-modifier p ercentage, static extraction time and dynamic extraction time on the SFE ef ficiency of nylon 6,6 oligomers were examined. Results from the SFE methods for oligomer extractions were compared to results from conventional solven t extraction. The extracted oligomers were identified by high-performance l iquid chromatography (HPLC) with coupled on-line atmospheric pressure chemi cal ionization mass spectrometry and HPLC fractionation coupled with off-li ne liquid secondary ion mass spectrometry. (C) 1999 Elsevier Science B.V. A ll rights reserved.