Journal of Materials Science

, Volume 44, Issue 17, pp 4705–4709 | Cite as

Morphological studies on single crystals and nanofibers of poly(heptamethylene terephthalate)

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


Poly(heptamethylene terephthalate) (poly(7GT)) was synthesized, and its lamellar single-crystals were grown isothermally at 70 °C from a dilute solution in 1-octanol. Poly(7GT) nanofibers were prepared via electrospinning of its solution in 1,1,1,3,3,3-hexafluoro-2-propanol. Morphology of the single crystals and that of as-spun and annealed nanofibers were investigated by transmission electron microscopy. Selected-area electron diffraction (SAED) of the crystals gave a well-defined N-pattern consisting of spot-like hk0 reflections, and that of bundles of the annealed nanofibers indicated a highly oriented fiber pattern. From the analysis of SAED diagrams for single crystals and nanofibers, it can be assumed that poly(7GT) takes an orthorhombic crystal system and its unit cell parameters estimated are as follows: a = 1.409 nm, b = 1.480 nm, c (chain axis) = 3.392 nm, and α = β = γ = 90°.


Transmission Electron Microscopy Observation Isothermal Crystallization HFIP Lamellar Crystal Chain Axis 



This study 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.


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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 UniversityGunmaJapan
  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 UniversityKyoto-fuJapan

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