Tensile behaviour of polyester yarns modified by solvent-acid mixture pretreatment process

163-172The tensile behaviour of original and heat-set fine filament and microdenier polyester yarns treated with trichloroacetic acid-chloroform (TCAC) solvent system has been studied. The polyester yarn samples have been treated in a relaxed state with various concentrations of TCAC mixture at room temperature for different durations. It is observed that the TCAC treatment causes significant changes in strength and elongation behaviour of original fine filament and microdenier polyester yarns. The solvent-treated yarns exhibit higher breaking elongation, improved work of rupture and lower tenacity. The improvement in elongation and work of rupture is found to be less in the case of heat-set polyester yarns due to the subsequent TCAC treatment. The influence of treatment time and heat selling temperature on strength, elongation, yield behaviour and work of rupture of TCAC-treated yarns has also been investigated