Effect of the uniaxial orientation on the polymer/filler nanocomposites using phosphonate-modified single-walled carbon
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Effect of the uniaxial orientation on the polymer/ filler nanocomposites using phosphonate‑modified single‑walled carbon nanotube with hydro‑ or fluorocarbons Takuto Hayasaki1 · Yoshinori Abiko1 · Ahmed A. Almarasy1 · Shuichi Akasaka2 · Atsuhiro Fujimori1 Received: 10 August 2020 / Revised: 10 August 2020 / Accepted: 24 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of drawn orientation on crystalline fluorinated polymer/carbon nanotube nanohybrids was investigated. Single-walled carbon nanotubes (SWCNTs) were surface-modified with long-chain phosphonic acids, thus imparting heat-resistant/nondesorption properties. Polyvinylidene fluoride (PVDF) was used as the crystalline fluorinated polymer and a polypropylene (PP) matrix as the crystalline hydrogenated polymer, for comparison. In the nanocomposite preparation, PVDF was combined with phosphonic acid-modified SWCNT containing fluorocarbon chains, and PP was combined with phosphonic acid-modified SWCNT containing hydrocarbon chains. Nanocomposite preparations of organo-SWCNTs with an affinity for the polymer matrix were achieved by a simple melt-compound method. These nanocomposites were uniaxially drawn at high temperatures near its melting point, and the organoSWCNTs were aligned in the polymer matrix along the drawn direction. The lamellae in the fluorinated polymer-based nanohybrids were aligned parallel to the drawn direction at 5 × drawing, and converted to a herringbone arrangement with a left– right tilting at 7 × to 9 × drawings. As a result, it was clarified that the addition of a small amount of SWCNT leads to an improvement of crystallinity, crystallization temperature, lamella thickness, and mechanical properties of the nanocomposites.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s0028 9-020-03388-w) contains supplementary material, which is available to authorized users. * Atsuhiro Fujimori [email protected]‑u.ac.jp 1
Graduate School of Science and Engineering, Saitama University, 255 Shimo‑okubo, Sakura‑ku, Saitama 338‑8570, Japan
2
Department of Chemical Science and Technology, Tokyo Institute of Technology, Ookayama, Meguro‑ku, Tokyo 152‑8552, Japan
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Vol.:(0123456789)
Polymer Bulletin
Graphic abstract Improvement of crystallization degree
Polymer/modified-SWCNT nanocomposite
Enhancement of mechanical property Stress/MPa
392 High temperature uniaxial drawing
200 0 0
20 40 Strain / %
Exo.
Increase of crystallization temperature 1st cooling
DR=5
ΔH 0.5 µm
Undrawn
Undrawn
Endo.
TEM
DR=7
130 150 Temperature / °C
Keywords Single-walled carbon nanotube · Organo-modification · Long-chain phosphonate · Nanocomposite · Uniaxial drawing
Introduction Controlling the structure on the nanometer level via the orientation effect has the potential to innovatively improve the physical properties of materials [1, 2]. Therefore, when rod-shaped, needle-shaped, and/or tubular nanofillers with a shape that has developed in the long
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