Mesophase structure discovered through in-situ X-ray measurement in drawing process of poly(ethylene 2,6-naphthalene dicarboxylate) fiber
✍ Scribed by KyoungHou Kim; Ryo Aida; YoungAh Kang; Yutaka Ohkoshi; Yasuo Gotoh; Masanobu Nagura; Hiroshi Urakawa
- Book ID
- 104087968
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 236 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
The structure development in the continuous laser-heated drawing process of poly(ethylene 2,6-naphthalene dicarboxylate) (PEN) fiber was analyzed by in-situ X-ray diffraction measurement. Because of the rapid and uniform laser heating, and the resultant steady-state nature of the necking-drawing, the structure development after the on-set of necking could be measured in the time resolution of several hundred microseconds. We found for the first time the temporal appearance of meridional (001 0 ) diffraction at several milliseconds after the on-set of necking indicating that the mesophase structure similar to the one reported for poly(ethylene terephthalate) was also formed in the initial stage of fiber structure development of PEN. The d-spacing of the (001 0 ) diffraction 1.230 AE 0.003 nm was shorter than the c-axis lengths of both a and b crystals.