No.5（2010）15.Study on Normal Pressure Dyeability of Poly Modified by Poly

Chen Xu, Yoshimitsu Ikeda, Yayoi Yoshida

  The dyeing process of poly(ethylene terephthalate) (PET) fiber is generally performed at high temperature around 130 o C and under high pressure. It consequently consumes a huge amount of energy, and makes it difficult for PET fiber to be dyed with those natural fibers that are high-temperature unendurable. Meanwhile, poly(trimethylene terephthalate) (PTT) has been drawing more and more attention to its good dyeability under atmospheric pressure. In the present study, the fibers manufactured by blending PTT pellets to PET pellets in the melt spinning process at ratio by weight of PET/PTT=100/0, 85/15, 50/50, 0/100 were dyed at 100 o C under atmospheric pressure. The pure fibers and modified fibers were investigated by applying a spectrophotometer, a differential scanning calorimeter (DSC), and a wide-angle X-ray diffractometer (WAXD), etc. It was found that the K/S value, which can be considered as an indication of dye concentration, of modified fibers was not only higher than that of PET fiber, but also higher than that of PTT fiber, suggesting improved dyeability of the modified PET fibers.

Keywords

PET, PTT, normal pressure dyeing, K/S, crystallinity, amorphous region

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