The outcomes of the electrospinning of polyamide 6 (PA6) solutions in formic acid containing FeCl3 are correlated with the extensional rheological behaviour of these fluids, which is investigated by the self-controlled capillary breakup of a filament. The rheological analysis enlightens a significant effect of the FeCl3 content on the rheological behaviour, the viscous component becoming predominant over a certain salt content threshold. At this concentration, the electrospun fibres show the formation of severely inhomogeneous structures this indicating that an elastically dominated behaviour is necessary to yield defect-free fibres. Addition of FeCl3 also decreases fibre crystallinity and fibres turn out to be completely amorphous above a critical concentration. Interestingly, this concentration coincides with the one at which the viscous component starts dominating the rheological behaviour.

The relevance of extensional rheology on electrospinning: the polyamide/iron chloride case

FORMENTI, SUSANNA;CASTAGNA, ROSSELLA;BERTARELLI, CHIARA;BRIATICO VANGOSA, FRANCESCO
2016-01-01

Abstract

The outcomes of the electrospinning of polyamide 6 (PA6) solutions in formic acid containing FeCl3 are correlated with the extensional rheological behaviour of these fluids, which is investigated by the self-controlled capillary breakup of a filament. The rheological analysis enlightens a significant effect of the FeCl3 content on the rheological behaviour, the viscous component becoming predominant over a certain salt content threshold. At this concentration, the electrospun fibres show the formation of severely inhomogeneous structures this indicating that an elastically dominated behaviour is necessary to yield defect-free fibres. Addition of FeCl3 also decreases fibre crystallinity and fibres turn out to be completely amorphous above a critical concentration. Interestingly, this concentration coincides with the one at which the viscous component starts dominating the rheological behaviour.
2016
"Electrospinning" "Capillary Breakup Extensional Rheometry" "CaBER" "PA6–FeCl3 solution"
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/971020
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