Electrospun nylon-4,6 nanofibers: Solution rheology and Brill transition

Chi Wang, Jen Hao Jheng, Fang Chyou Chiu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Polyelectrolyte solutions of nylon-4,6 in 99 vol.% formic acid were electrospun, and then the concentration effect on the solution spinnability was studied. The microstructure of the as-spun nanofibers was characterized by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Based on the solution rheology, the concentration of the entangled regime and the concentrated regime were 1 and 10 wt.%, respectively. To prepare bead-free fibers, the minimum polymer concentration used was 10 wt.%, yielding a fiber diameter of 49 ± 13 nm. The fiber diameter (df) was dependent on the solution viscosity (η o) or the polymer concentration through the following simple scaling law relation: d f ∼ η o 0.62 and d f ∼ φ w φ D 2.25. DSC heating trace on the as-spun nanofibers exhibited double-melting behavior. However, after cooling, the second heating trace showed a single melting peak. WAXD intensity profiles showed that the as-spun nanofibers possessed lamellae with small lateral dimensions, and the lattice parameter difference between a-axis and b-axis was significantly reduced due to the rapid electrospinning process. Both structural features induce the occurrence of the Brill transition of nylon-4,6 in the nanofibers at a much lower temperature of 80 C than that in the melt-processed film, as-revealed by the temperature-variable WAXD.

Original languageEnglish
Pages (from-to)2337-2344
Number of pages8
JournalColloid and Polymer Science
Volume291
Issue number10
DOIs
Publication statusPublished - 2013 May 17

Fingerprint

Nylon (trademark)
Nylons
Nanofibers
Rheology
rheology
formic acid
X ray diffraction
fibers
Fibers
Differential scanning calorimetry
Polymers
Melting
heat measurement
diffraction
melting
Heating
heating
x rays
scanning
Scaling laws

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

Cite this

Wang, Chi ; Jheng, Jen Hao ; Chiu, Fang Chyou. / Electrospun nylon-4,6 nanofibers : Solution rheology and Brill transition. In: Colloid and Polymer Science. 2013 ; Vol. 291, No. 10. pp. 2337-2344.
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abstract = "Polyelectrolyte solutions of nylon-4,6 in 99 vol.{\%} formic acid were electrospun, and then the concentration effect on the solution spinnability was studied. The microstructure of the as-spun nanofibers was characterized by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Based on the solution rheology, the concentration of the entangled regime and the concentrated regime were 1 and 10 wt.{\%}, respectively. To prepare bead-free fibers, the minimum polymer concentration used was 10 wt.{\%}, yielding a fiber diameter of 49 ± 13 nm. The fiber diameter (df) was dependent on the solution viscosity (η o) or the polymer concentration through the following simple scaling law relation: d f ∼ η o 0.62 and d f ∼ φ w φ D 2.25. DSC heating trace on the as-spun nanofibers exhibited double-melting behavior. However, after cooling, the second heating trace showed a single melting peak. WAXD intensity profiles showed that the as-spun nanofibers possessed lamellae with small lateral dimensions, and the lattice parameter difference between a-axis and b-axis was significantly reduced due to the rapid electrospinning process. Both structural features induce the occurrence of the Brill transition of nylon-4,6 in the nanofibers at a much lower temperature of 80 C than that in the melt-processed film, as-revealed by the temperature-variable WAXD.",
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Electrospun nylon-4,6 nanofibers : Solution rheology and Brill transition. / Wang, Chi; Jheng, Jen Hao; Chiu, Fang Chyou.

In: Colloid and Polymer Science, Vol. 291, No. 10, 17.05.2013, p. 2337-2344.

Research output: Contribution to journalArticle

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