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Journal of Materials Science

, Volume 44, Issue 8, pp 2137–2142 | Cite as

Stacked-lamellar structure of electrospun poly(heptamethylene terephthalate) nanofibers

  • Yutaka KawaharaEmail author
  • Satoshi Naruko
  • Atsushi Nakayama
  • Ming-Chien Wu
  • Eamor M. Woo
  • Masaki Tsuji
Article

Abstract

Poly(heptamethylene terephthalate) (poly(7GT)), which is an aromatic polyesters was synthesized, and nanofibers of poly(7GT) were prepared via electrospinning from its solution in 1,1,1,3,3,3-hexafluoro-2-propanol. Uniaxially oriented thin films were also prepared by applying shear strain to molten poly(7GT). Morphology of as-spun and annealed nanofibers and that of uniaxially oriented thin films were investigated by transmission electron microscopy. Selected-area electron diffraction (SAED) of bundles of the annealed nanofibers gave a highly oriented fiber pattern. In addition, dark-field images of the poly(7GT) nanofibers, which had been annealed at 85 °C for 48 h, were taken by using some of the reflections on/near the equator. The images showed a stacked-lamellar structure, in which crystalline lamellae appearing as bright striations oriented perpendicularly to the fiber axis were stacked in the direction of the fiber axis, and the corresponding average long period was estimated at about 19 nm. As for the uniaxially oriented thin films, SAED also gave an oriented fiber pattern. When the annealing of the films was performed similar to nanofibers, crystallization occurred and a stacked-lamellar structure was constructed parallel to the shearing direction. The corresponding average long period was estimated at about 27 nm. By comparing the fiber patterns between annealed nanofibers and thin films, it seems that electrospinning is more effective than uniaxial stretching in enhancing the molecular orientation in the case of poly(7GT).

Keywords

Fiber Axis SAED Pattern HFIP Butylene Terephthalate Conductive Strip 

Notes

Acknowledgements

This work was supported by a Grant-in-Aid for Scientific Research (C) (2), partly No. 16550174 and also supported by a Grant-in-Aid for Scientific Research (C), No.19550207, from Japan Society for the Promotion of Science (JSPS) to which M.T. and Y.K. wish to express their gratitude.

References

  1. 1.
    Yoshioka T, Tsuji M, Kawahara Y (2007) Sen’i Gakkaishi 63:P39CrossRefGoogle Scholar
  2. 2.
    Yoshioka T, Tsuji M, Kawahara Y, Kohjiya S (2003) Polymer 44:7997CrossRefGoogle Scholar
  3. 3.
    Nakayama A, Kawahara Y, Hayakawa Y, Takahashi R, Yoshioka T, Tsuji M (2007) Sen’i Gakkaishi 63:230CrossRefGoogle Scholar
  4. 4.
    Yoshioka T, Tsuji M, Kawahara Y, Kohjiya S, Manabe N, Yokota Y (2005) Polymer 46:4987CrossRefGoogle Scholar
  5. 5.
    Goodman I (1962) Angew Chem 74:606CrossRefGoogle Scholar
  6. 6.
    Gilbert M, Hybart FJ (1972) Polymer 13:327CrossRefGoogle Scholar
  7. 7.
    Li D, Wang Y, Xia Y (2004) Adv Mater 16:361CrossRefGoogle Scholar
  8. 8.
    Nakayama A, Hayakawa Y, Tsuji M, Kohjiya S, Kawahara Y (2006) Proceeding of polymer processing society 22nd annual meeting (PPS-22) p 201Google Scholar
  9. 9.
    Novillo FA, Fujita M, Tsuji M, Kohjiya S (1998) Sen’i Gakkaishi 54:544CrossRefGoogle Scholar
  10. 10.
    Shimizu J, Kikutani T (2002) J Appl Polym Sci 83:539CrossRefGoogle Scholar
  11. 11.
    Kawahara Y, Naruko S, Nakayama A, Wu MC, Woo EM, Tsuji M (2008) Acta Cryst A64:C601CrossRefGoogle Scholar
  12. 12.
    Desborough IJ, Hall IH, Neisser JZ (1979) Polymer 20:545CrossRefGoogle Scholar
  13. 13.
    Poulin-Dandurand S, Pérez S, Revol JF, Brisse F (1979) Polymer 20:419CrossRefGoogle Scholar
  14. 14.
    Wang B, Li CY, Hanzlicek J, Cheng SZD, Geil PH, Grebowicz J, Ho RM (2001) Polymer 42:7171CrossRefGoogle Scholar
  15. 15.
    Yokouchi M, Sakakibara Y, Chatani Y, Tadokoro H, Tanaka T, Yoda K (1976) Macromolecules 9:266CrossRefGoogle Scholar
  16. 16.
    Wu PL, Woo EM (2004) J Polym Sci Part B Polym Phys 42:1265CrossRefGoogle Scholar
  17. 17.
    Hall IH, Pass MG, Rammo NN (1978) J Polym Sci Polym Phys Ed 16:1409CrossRefGoogle Scholar
  18. 18.
    Palmer A, Poulin-Dandurand S, Revol JF, Brisse F (1984) Eur Polym J 20:783CrossRefGoogle Scholar
  19. 19.
    Jeong YG, Lee SC, Shin K (2009) J Polym Sci Part B Polym Phys 47:276CrossRefGoogle Scholar
  20. 20.
    Farrow G, McIntosh J, Ward IM (1960) Makromol Chem 38:147CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Yutaka Kawahara
    • 1
    Email author
  • Satoshi Naruko
    • 2
  • Atsushi Nakayama
    • 1
  • Ming-Chien Wu
    • 3
  • Eamor M. Woo
    • 3
  • Masaki Tsuji
    • 4
  1. 1.Department of Biological and Chemical EngineeringGunma UniversityKiryuJapan
  2. 2.Graduate School of Science and TechnologyKyoto Institute of TechnologyKyotoJapan
  3. 3.Department of Chemical EngineeringNational Cheng Kung UniversityTainanTaiwan
  4. 4.Institute for Chemical ResearchKyoto UniversityUjiJapan

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