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

Chi Wang, Jen Hao Jheng, Fang Chyou Chiu

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9 Citations (Scopus)


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
Issue number10
Publication statusPublished - 2013 May 17

All Science Journal Classification (ASJC) codes

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


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