Feasibility of Extraction And Quantification of Fiber Finishes via Online SFE/FT-IR

Abstract

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).

Effects of Twaron fiber surface treatment by air dielectric barrier discharge plasma on the interfacial adhesion in fiber reinforced composites

“…Therefore, one can be sure that the remarkable increase of N concentration on TFT surface originates from the body structure of aramid fiber, suggesting that more surface of naked Twaron fiber appears with the removal of the oily finish by plasma etching and/or chemical reactions. This result can also explain the decrease of O concentration on TFT surface which is mainly from the finish [28]. Compared with the surface C, O, N concentrations of TF sample, the surface chemical composition of TFT are more close to that of the TRT sample.…”

Analysis of Fiber Finishes Using SFE Coupled to a Simple, Universal IR Flow Cell

“…We have reported dye diffusion rates in multiple layers of nylon fabrics [ 4,5,6 j and porous membranes [ 7, 8 j . We observed that surface concentration of dye in multiple layers increased with dyeing time. The increasing surface concentration was attributable to the resistance to dye transfer across the diffusional boundary layer.…”

“…The nylon 6 fabric was a taffeta with a fabric density of 42 / cm (70 denier, 12 filaments) for warp yam and 32 / cm (70 denier, 24 filaments) [5] for the weft yam. The diaœtate fabric was a taftèta with a fabric density of 42 / cm (70 denia, 21 filaments) for the wup yam and 30 / cm ( 100 denier, 25 niaments) for the weft…”

“…This particular technique will be referred to as sFE on-line IR or simply SFE-IR [6]. The feasibility of SFE-IR for fiber finish analysis has been reported elsewhere [3,4,5,7]. In the work of Kirschner, Jordan, Taylor and Seemuth, they used a commercially available SFC/FTIR interface module to couple the SFE extractor to the IR spectrometer, but it was specially optimized for si=c work and thus overdesigned for most sFE applications [5].…”

“…The feasibility of SFE-IR for fiber finish analysis has been reported elsewhere [3,4,5,7]. In the work of Kirschner, Jordan, Taylor and Seemuth, they used a commercially available SFC/FTIR interface module to couple the SFE extractor to the IR spectrometer, but it was specially optimized for si=c work and thus overdesigned for most sFE applications [5]. This module is less adaptable to other commercial IR spectrometers, and it is quite expensive since it also includes the IR detector.…”