The method of on-line supercritical fluid extraction/Fourier transform infrared spectrometry (SFE/FT-IR) has been applied to the analysis of fiber finishes on fiber/textile matrices. Three different fiber polymer types were examined, each requiring a different finish. Finishes ranged from a single-component poly(dimethylsiloxane) oil to more complex multicomponent finishes that included various surfactants, fatty acid esters and soaps, antioxidants, and oils. The three fiber types tested were polyurethane, polyamide, and aramid. Off-line extraction showed all three finishes to be over 89% extractable with pure CO> Calibration curves were established for the three finishes, with relatively low error and reasonable detection limits (i.e., 0.2-5 µ8).

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On-line supercritical fluid extraction / Fourier transform infrared spectrometry was applied to a complex polyester fiber finishing system consisting of seven components. Off-line extractions of these components with 100% CO2 revealed that they ranged in extractability from 25-100%. Due to certain analyte solubility limitations, intermediate trapping was used for quantitative recovery of the finish for subsequent on-line infrared analysis. Ultimately, a calibration curve was developed from finish standards. The percent finish on yarn was calculated using the SFE method and compared with that from conventional solvent extraction.

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