Core-sheath polyurethane-carbon nanotube nanofibers prepared by electrospinning |
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| Authors: | Sravendra Rana Jae Whan Cho |
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| Institution: | (1) Deparment of Chemistry, University of Malakand, Chakdara, Dir (L), NWFP, Pakistan;(2) Department of Polymer Science, Kyungpook National University, #1370 Sankyuk-dong, Buk-gu, Daegu, 702-701, South Korea |
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| Abstract: | The core-sheath nanofibers consisting of polyurethane (PU) core and PU composites sheath with multi-walled carbon nanotubes
(MWNTs) were prepared by electrospinning. At low MWNT concentration, MWNTs appeared highly aligned along the fiber axis with
some curving in nanotubes, whereas in case of high concentration, some aggregation of MWNTs appeared due to difficulty in
full dispersion of nanotubes. In comparison of the single component nanofiber webs, the core-sheath nanofiber webs showed
much better mechanical properties of modulus and breaking stress, including an exceptional elongation-at-break. It indicates
that the CNT-incorporated core-sheath structure is very effective for enhancing the mechanical properties of nanofiber webs.
In addition, the core-sheath nanofibers demonstrated the fast shape recovery, compared with one component fibers of pure shape
memory PU and PU/MWNTs, which provides the possibility of fabricating more sensitive intelligent materials. |
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