Investigation of Mechanical and Physical Properties of PET Nanofiber Hollow Yarn

Abstract

In this study, mechanical and physical properties of polyethylene terephthalate (PET) nanofiber hollow yarn in various concentrations of PET polymeric solution were investigated. First, five different concentrations (18, 21, 24, 27, and 30% w/v) of PET solutions were prepared in (TFA) / (DCM) mixtures (70: 30 v/v), and then the electrospining was done for each concentration in a way that to put PVA multifilament in the core and to twist PET nanofibers onto multifilament yarn as a sheath simultaneously, followed by dissolving PVA yarn in hot water, PET nanofiber hollow yarn was produce. The surveys of mechanical properties of PVA multifilament yarn, core-sheath yarns and hollow yarns showed that the PVA multifilament yarn and nanofiber hollow yarn in concentrations of 30% w/v PET polymeric solution had the highest and lowest average strength respectively. Also surveys of elongation showed that PVA multifilament yarn, core-sheath yarns and hollow yarns did not have any significant difference on average extension. Regarding physical properties, the wicking property of hollow yarns in different concentrations of polymeric solution were surveyed. Results showed that the PET nanofiber hollow yarn in concentration of 24% w/v PET polymeric solution had the highest coefficient wicking. More the regain moisture of hollow yarns were surveyed and concluded that the PET nanofiber hollow yarn in concentrations of 18% w/v PET polymeric solution had the most regain moisture.