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Porous Nylon-6 Fibers via a Novel Salt-Induced Electrospinning Method.

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Title: Porous Nylon-6 Fibers via a Novel Salt-Induced Electrospinning Method.
Authors: Amit Gupta1, Carl D. Saquing1, Mehdi Afshari1, Alan E. Tonelli1, Saad A. Khan1, Richard Kotek1
Source: Macromolecules. Feb2009, Vol. 42 Issue 3, p709-715. 7p.
Subjects: Nylon, Porous materials, Electrospinning, Lewis acids, Gallium compounds, Hydrogen bonding, Surface area
Abstract: Porous nylon-6 fibers are obtained from Lewis acid−base complexation of gallium trichloride (GaCl3) and nylon-6 using electrospinning followed by GaCl3removal. DSC and FTIR results reveal that the electrospun fibers, prior to GaCl3removal, are amorphous with no hydrogen bonds present between nylon-6 chains. GaCl3being a Lewis acid interacts with the Lewis base sites (CO groups) on the nylon-6 chains, thereby preventing the chains to crystallize via intermolecular hydrogen bonding. Subsequent removal of GaCl3from the as-spun fibers by soaking the electrospun web in water for 24 h leads to the formation of pores throughout the fibers. While the average fiber diameter remains effectively the same after salt removal, the average surface area increases by more than a factor of 6 for the regenerated fibers. The dual use of a metal salt (Lewis acid) to (a) facilitate fiber formation by temporary removal of polymer interchain interactions and (b) act as a porogen provides a facile approach to obtain porous fibers via electrospinning. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Porous nylon-6 fibers are obtained from Lewis acid−base complexation of gallium trichloride (GaCl3) and nylon-6 using electrospinning followed by GaCl3removal. DSC and FTIR results reveal that the electrospun fibers, prior to GaCl3removal, are amorphous with no hydrogen bonds present between nylon-6 chains. GaCl3being a Lewis acid interacts with the Lewis base sites (CO groups) on the nylon-6 chains, thereby preventing the chains to crystallize via intermolecular hydrogen bonding. Subsequent removal of GaCl3from the as-spun fibers by soaking the electrospun web in water for 24 h leads to the formation of pores throughout the fibers. While the average fiber diameter remains effectively the same after salt removal, the average surface area increases by more than a factor of 6 for the regenerated fibers. The dual use of a metal salt (Lewis acid) to (a) facilitate fiber formation by temporary removal of polymer interchain interactions and (b) act as a porogen provides a facile approach to obtain porous fibers via electrospinning. [ABSTRACT FROM AUTHOR]
ISSN:00249297
DOI:10.1021/ma801918c