Ethylene terephthalate oligomers in the processes of modification of polyester fabrics in supercritical carbon dioxide

Abstract

The influence of the conditions of processing of polyester fiber material in the supercritical carbon dioxide (SC-CO2) medium on the localization of ethylene terephthalate cyclic oligomers on the surface of fibers is studied. It is shown that cyclic oligomers are deposited on the surface of polyester fiber materials in the form of large associates. The mechanism of migration of oligomers from the interior of polyester fibers plasticized in the SC-CO2 medium is considered. Recommendations to minimize the amount of surface oligomers in the dyeing of polyester fiber materials in SC-CO2 are given. It is shown that the deposition of oligomers on the surface of polyester fabric does not adversely affect the quality of their hydrophobization with ultrafine polytetrafluoroethylene in the SC-CO2 medium.