| 초록 |
The morphological change and molecular orientation of electrospun ultrafine poly(ethylene terephthalate) (PET) fibers were investigated during uniaxial drawing below and around the glass transition temperature of the fibers. The ultrafine PET fibers were electrospun from 8, 10, and 12 wt% PET solutions in 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), and the average diameters of the resulting PET fibers were 220, 450, and 1600 nm, respectively. A necking phenomenon in ultrafine polymer fibers was observed for the first time from these ultrafine PET fibers during uniaxial drawing at 25 oC. When the ultrafine PET fibers electrospun from the 12 wt% PET solution were drawn at 25 oC, they showed a higher dichroic ratio and a higher fraction of trans conformer of the ethylene glycol moiety than those drawn at 75 oC at the same strain. |
