Key words: oligomers of ethylene terephthalate, supercritical carbon dioxide, polyester fabric, dyeing, hydrophobization, superdispersed polytetrafluoroethylene
The effect of conditions of polyester fibrous material processing in supercritical carbon dioxide (SC-CO2) onto the localization of cyclic oligomers of ethylene terephthalate on the fiber surface is investigated. It is shown that the cyclic oligomers are deposited on the surface of polyester fibrous materials in the form of large associates. The mechanism of oligomer migration from the inner areas of polyester fiber plasticized in SC-CO2 is considered. Recommendations for the minimization of amount of oligomers localized on the surface of polyester fibrous materials during their dyeing in the SC-CO2 medium are suggested. It is shown that the deposition of oligomers on the surface of polyester fabrics does not negatively affect the quality of their hydrophobization by superdispersed polytetrafluoroethylene in SC-CO2 medium.
doi:10.1134/S1990793112070068