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Preparation of poly(ethylene-2,6-naphthalate) nanofibers by CO2 laser supersonic drawing

Polymer Journal volume 53, pages 593–601 (2021)Cite this article

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Abstract

Poly(ethylene-2,6-naphthalate) (PEN) nanofibers were prepared by carbon dioxide laser supersonic drawing (CLSD). The CLSD method was carried out by irradiating the as-spun PEN fiber with a laser in a low-temperature supersonic jet. The supersonic jet was generated by blowing the air from the fiber supplying orifice into a vacuum chamber. The thinnest nanofiber obtained at a laser power of 4 W and a chamber pressure of −98 kPa had an average fiber diameter of 0.249 μm. The DSC curve of this nanofiber showed two melting peaks: 260 °C and 285 °C. The higher melting temperature is 25 °C higher than the melting temperature of the original fiber. The higher melting peak is caused by an increase in the intermolecular forces in the crystallite and by the tie molecules connecting adjacent crystallites becoming fully extended. Thus, nanofibers produced by CLSD exhibit a higher melting peak, which is a unique feature. The increase in melting temperature is attributed to the supramolecular sequence effect, which is a nanoscale effect. CLSD is a new method for making nanofibers without the use of any solvent or removal of a second component.

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  1. Graduate Faculty of Interdisciplinary Research, University of Yamanashi, Takeda-4, Kofu, 400-8511, Japan

    Akihiro Suzuki & Yasutaka Oshiro

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  1. Akihiro Suzuki
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  2. Yasutaka Oshiro
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Correspondence to Akihiro Suzuki or Yasutaka Oshiro.

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Suzuki, A., Oshiro, Y. Preparation of poly(ethylene-2,6-naphthalate) nanofibers by CO2 laser supersonic drawing. Polym J 53, 593–601 (2021). https://doi.org/10.1038/s41428-020-00460-0

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