2024-03-29T13:56:11Z
https://soar-ir.repo.nii.ac.jp/oai
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2022-12-14T04:27:34Z
1309:1310
Effect of drawing stress on mesophase structure formation of poly(ethylene 2,6-naphthalene dicarboxylate) fiber just after the neck-drawing point
Kim, Kyoung-Hou
Aida, Ryo
Kang, Young-Ah
Ikaga, Toshifumi
Ohkoshi, Yutaka
Wataoka, Isao
Urakawa, Hiroshi
Poly(ethylene 2,6-naphthalene dicarboxylate)
Mesophase structure
CO2 laser-heated drawing
The structural development of poly(ethylene 2,6-naphthalene dicarboxylate) (PEN) fibers was analyzed by in situ X-ray diffraction and fiber temperature measurements. The PEN fiber was drawn continuously under three drawing stresses, where the neck-drawing point was fixed accurately by CO2 laser irradiation heating. The developed crystal structures of the drawn fibers depended on the drawing stresses, that is, only the alpha-crystal was obtained under a drawing stress of 148 MPa, an alpha-rich mixed crystal was obtained for 54 MPa, and a beta-rich mixed crystal was obtained under 23 MPa stress. Fiber containing over 70% beta-crystal was obtained in the third case. Orientation-induced crystallization rates (K) and crystallization induction times (t(0)) were estimated for the three drawing stresses: K = 2210 s(-1) and t(0) = 0.5 ms for 148 MPa, K = 940 s(-1) and t(0) = 1.0 ms for 54 MPa, and K= 655 s(-1) and t(0) = 4.0 ms for 23 MPa. In addition, the drawing stress acted as a definitive influence not only on the resulting crystal form but also on the chain conformation of the mesophase structure. The d-spacing of the (001') diffraction increased with drawing stress, and the longer (001') spacing generated the alpha-crystal while the comparatively shorter (001') spacing yielded the beta-crystal. The d-spacings of 1.27 and 1.23 nm for the drawing stresses of 148 and 23 MPa, respectively, were somewhat shorter than the c-axis lengths of the alpha- and beta-crystals of 1.32 and 1.27 nm, respectively.
Article
POLYMER. 53(19):4272-4279 (2012)
journal article
ELSEVIER SCI LTD
2012-08-31
application/pdf
POLYMER
19
53
4272
4279
0032-3861
AA00776983
https://soar-ir.repo.nii.ac.jp/record/13317/files/Effect_drawing_stress_mesophase_structure.pdf
eng
10.1016/j.polymer.2012.07.043
https://doi.org/10.1016/j.polymer.2012.07.043
Copyright© 2012 Elsevier Ltd.