Wet spinning of polyacrylonitrile/carbon nanotubes (PAN/CNT) composite fibers was studied and the effect of spinning conditions on structure and properties of as-spun fibers influenced by the presence of CNTs investigated. Unlike PAN fibers, shear force had a larger effect on crystalline structure and physical and mechanical properties of PAN/CNT composite fibers compared to the elongational force inside a coagulation bath. Under shear force CNTs induced nucleation of new crystals, whereas under elongational force nucleation of new crystals were hindered but the already formed crystals grew bigger. To our knowledge, this key effect has not been reported elsewhere. At different shear rates, strength, Young's modulus and strain at break of PAN/CNT as-spun fibers were improved up to 20% compared to PAN fibers. Application of jet stretch had less influence on physical and mechanical properties of PAN/CNT fibers compared to PAN fibers. However, the improvement of interphase between polymer chains and CNTs as a result of chain orientation may have contributed to enhancement of Young's modulus of jet stretched composite fibers.

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process / Mirbaha, Hamideh; Nourpanah, Parviz; Scardi, Paolo; D'Incau, Mirco; Greco, Gabriele; Valentini, Luca; Bittolo Bon, Silvia; Arbab, Shahram; Pugno, Nicola. - In: MATERIALS. - ISSN 1996-1944. - ELETTRONICO. - 12:17(2019), p. 2797. [10.3390/ma12172797]

The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process

Scardi, Paolo;D'incau, Mirco;Greco, Gabriele;Bittolo Bon, Silvia;Pugno, Nicola
2019

Abstract

Wet spinning of polyacrylonitrile/carbon nanotubes (PAN/CNT) composite fibers was studied and the effect of spinning conditions on structure and properties of as-spun fibers influenced by the presence of CNTs investigated. Unlike PAN fibers, shear force had a larger effect on crystalline structure and physical and mechanical properties of PAN/CNT composite fibers compared to the elongational force inside a coagulation bath. Under shear force CNTs induced nucleation of new crystals, whereas under elongational force nucleation of new crystals were hindered but the already formed crystals grew bigger. To our knowledge, this key effect has not been reported elsewhere. At different shear rates, strength, Young's modulus and strain at break of PAN/CNT as-spun fibers were improved up to 20% compared to PAN fibers. Application of jet stretch had less influence on physical and mechanical properties of PAN/CNT fibers compared to PAN fibers. However, the improvement of interphase between polymer chains and CNTs as a result of chain orientation may have contributed to enhancement of Young's modulus of jet stretched composite fibers.
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Mirbaha, Hamideh; Nourpanah, Parviz; Scardi, Paolo; D'Incau, Mirco; Greco, Gabriele; Valentini, Luca; Bittolo Bon, Silvia; Arbab, Shahram; Pugno, Nicola
The Impact of Shear and Elongational Forces on Structural Formation of Polyacrylonitrile/Carbon Nanotubes Composite Fibers during Wet Spinning Process / Mirbaha, Hamideh; Nourpanah, Parviz; Scardi, Paolo; D'Incau, Mirco; Greco, Gabriele; Valentini, Luca; Bittolo Bon, Silvia; Arbab, Shahram; Pugno, Nicola. - In: MATERIALS. - ISSN 1996-1944. - ELETTRONICO. - 12:17(2019), p. 2797. [10.3390/ma12172797]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/241565
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