| At present, there are two main applications to woven fabric of PTT fiber. One is the PTT "shape memory" fabric (the thin & tight woven fabric made of PTT filament). The other is the elastic woven fabric made of PTT/PET bicomponent filament. On the basis of the existed studies, in this paper, we did the research mainly in the four aspects: the handle difference between PTT and PET fabric at low temperature, whether the PTT blended fabrics have the easy care property which the "shape memory" fabrics have, the elastic and wrinkle-resistant property of PTT/PET staple fabric, and the mechanical properties at the low stress.The main content and conclusions were achieved as following:(1) The dynamic mechanical temperature spectra of PTT, PET filament, PTT "shape memory" fabric and PET fabric (having the same structure with PTT "shape memory" fabric) were respectively tested by the dynamic mechanical analyzer. The results shows that the low-temperature transition peak temperature of PTT filament is at about -65～55℃; PET filament is -50～-40℃; the warp and weft direction of PTT "shape memory" fabric are at about -30～-20℃and -35～-25℃; the warp and weft direction of PET fabric are -35～-25℃and -30～-10℃.By executing the differential curve of elastic modulus with temperature changes (accurately the incremental curve), we found that, in the range of -50～50℃, the elastic modulus increments of PTT filament, "shape memory" fabric, PET filament and fabric are becoming increasingly large with the temperature gradually decreased. And the elastic modulus increment of PET filament increases faster than PTT filament; the elastic modulus increment of PET fabric increases faster than PTT "shape memory" fabric. After 0℃, the elastic modulus increment of PET filament and fabric increases dramatically, whereas the PTT filament and "shape memory" fabric increases gently. This shows that the handle of PET filament and fabric is easier to harden than PTT filament and "shape memory" fabric at low temperature. This means that, at low temperature, the handle of PTT "shape memory" fabric is better than PET fabric.(2) Using the objective evaluation methods for force stimulating recovery which was built up in the earlier research process of PTT "shape memory" fabric, the cotton/(PTT /PET bicomponent ) fabric was tested. After the press of 2Kg static objects for 24 hours and recovering its natural state for 5min, the crease recovery rate is less than 30%; after the iron force of 100g (5N/cm-2) combined with 35±2℃, the crease recovery rate doubled, reaching about 60%. By Comparing with the PTT,PTT/PET and PET fabrics, the force stimulating recovery of cotton/bicomponent fabric is worse than PTT "shape memory" fabric but equivalent with the cotton/XLA core fabric. After washing treatment, the force stimulating recovery of cotton/bicomponent fabric has a certain degree improvement.(3) The tensile properties, the elastic recovery and the crease recovery of cotton/bicomponent fabric were respectively tested by Fabric Strength Tester YG065H and Fabric Scrimp and Elasticity Tester YG541B. When the content of PTT/PET bicomponent staple is 19.5% and the weft fineness is 19.4tex, the tensile property of cotton/bicomponent fabric is approach to the cotton/bicomponent core fabric; the tensile initial modulus is lower and the handle is softer. When stretched repeatedly under constant elongation and load, the elastic recovery of cotton/bicomponent fabric is good, and the elastic recovery property is close to cotton/spandex core fabric and cotton/XLA core fabric. The crease recovery of cotton/bicomponent fabric is close to cotton/XLA core fabric and better than cotton/spandex core fabric.(4) The low load mechanical properties of cotton/bicomponent fabrics were tested by the KES-FB and compared with cotton and cotton/PTT fabrics. The tensile curve linearity of these fabrics is no less, indicating that the deformation property of these fabrics is close in on. The bending stiffness of cotton/bicomponent fabric is lower than the cotton fabric and close to cotton/PTT fabric. The shear hystersis 2HG,2HG5 is lower than cotton and cotton/PTT fabric. The compression work of cotton/bicomponent fabric is near to the cotton/PTT fabric and lower than cotton fabric. The MMD and SMD of cotton/bicomponent fabric is close to the cotton fabric, while MIU is lower than the cotton fabric. |
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