Abstract
The surface thermodynamic properties of fibers from a variety of Kevlar 29 fabrics have been measured using inverse gas chromatography (IGC). The enthalpy (ΔH° A), entropy (ΔS° A), and free energy (ΔG° A) of adsorption, and the dispersive component of the surface free energy (γd s) have been calculated from alkane retention volumes on fibers with various surface finishes, in addition to commercially scoured and laboratory cleaned samples. All of the samples, with the exception of the laboratory cleaned sample, have low surface energies consistent with the presence of surface finishes or, in the case of the scoured samples, significant surface contamination. A majority of these samples also exhibit anomalous alkane retention volumes around room temperature. This phenomenon, absent in the laboratory cleaned sample, is consistent with a glass transition in the surface film. Infrared analysis of material extracted from these samples supports this conclusion. The detection of glass transitions in surface films...
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