Citation: Ali Abbasi, Mohamed Mahmoud Nasef, Matsuura Takeshi, Reza Faridi-Majidi. Electrospinning of Nylon-6,6 Solutions into Nanofibers：Rheology and Morphology Relationships[J]. Chinese Journal of Polymer Science, ;2014, 32(6): 793-804. doi: 10.1007/s10118-014-1451-8 shu

Electrospinning of Nylon-6,6 Solutions into Nanofibers：Rheology and Morphology Relationships

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Faculty of Chemical Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia
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1. Institute of Hydrogen Economy, International Campus, Universiti Teknologi Malaysia, Jalan Semarak, 54100 Kuala Lumpur, Malaysia
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2. Malaysia-Japan International Institute of Technology, International Campus, Universiti Teknologi Malaysia, Jalan Semarak, 54100 Kuala Lumpur, Malaysia
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Department of Chemical &
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Department of Medical Nanotechnology, School of Advanced Medical Technologies, Tehran University of Medical Sciences, Tehran 14174, Iran

Corresponding author: Mohamed Mahmoud Nasef,
Received Date: 25 September 2013
Revised Date: 14 January 2014

Fund Project: This work was financially supported by the Universiti Teknologi Malaysia, (UTM) for providing IDF.

The relationship between the rheological properties of nylon-6,6 solutions and the morphology of their electrospun nanofibers was established. The viscosity of nylon-6,6 in formic acid (90%) was measured in the concentration range of 5 wt%-25 wt% using a programmable viscometer. Electrospinning of nylon-6,6 solutions was carried out under controlled parameters. The chemical structure, morphology and thermal properties of the obtained nanofibers were investigated using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), respectively. Entanglement concentration (ce) was found to be 15 wt% and a power law relationship between specific viscosity and solution concentration was observed with exponents of 2.0 and 3.3 for semi-dilute unentangled (c ce) and semi-dilute entangled (c ce) regimes, respectively. The diameter and uniformity of the nanofibers were found to be dependent on the viscosity. Moreover, the average diameter of electrospun nanofibers was found to be dependent on zero shear rate viscosity and normalized concentration (c/ce) in a power law relationship with exponents of 0.298 and 0.816, respectively. For nylon-6,6 solutions, the entanglement concentration (ce = 15 wt%) provides the threshold viscosity required for the formation of a stable polymeric jet during electrospinning and producing uniform beadless fibers. For concentrations less than ce, beaded fibers with some irregularities are formed. DSC analysis showed an increase in crystallinity of all electrospun samples compared to original polymer. Furthermore, Based on FTIR spectroscopy, phase is dominant in electrospun nanofibers and minor amount of and phases is also available.
- Nylon-6,6 electrospinning,
- Viscosity,
- Nanofibers,
- Entanglement concentration,
- Crystallinity
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