Preparation and characterization of electrospun ultrafine polyamide‐6 nanofibers

Abstract

We report on the preparation and characterization of ultrafine polyamide‐6 nanofibers by the electrospinning technique. The effect of electrospinning on the formation of ultrafine polyamide‐6 nanofiber structure was examined. The morphological and structural characterizations and thermal properties of the ultrafine polyamide‐6 nanofibers were investigated in comparison with bulk polyamide‐6 pellets. In order to accurately characterize the ultrafine polyamide‐6 nanofiber structure by direct identification of mass resolved components, we performed matrix‐assisted laser desorption ionization time‐of‐flight (MALDI‐TOF) mass spectrometry. Field emission scanning electron microscopy images revealed the presence of ultrafine polyamide‐6 nanofibers bound between the main fibers. The diameter of the polyamide‐6 nanofibers was observed to be in the range 75–110 nm, whereas the ultrafine structures consisted of regularly distributed very fine nanofibers with diameters of about 9–28 nm. The MALDI‐TOF spectra showed the presence of protonated and sodiated ions that were assigned to polyamide‐6 chains. Copyright © 2011 Society of Chemical Industry

Effect of argon plasma treatment on hydrophilic stability of nanofiber webs

“…The strong peaks at 1642 cm −1 and 1550 cm −1 are assigned to the amide I (CO stretch) and amide II (CN stretch and CONH bend), respectively, for PA6 . Similar to what is found in the literature, peaks at 1171 cm −1 (CH 2 twist wag vibration), 1199 cm −1 (CH 2 twist wag vibration), 1268 cm −1 (CH 2 twist wag vibration), 1440 cm −1 (CH 2 scissors vibration), 2860 cm −1 (symmetric CH 2 stretch), 2928 cm −1 (asymmetric CH 2 stretch), 3082 cm −1 (Fermi resonance of NH stretching with the overtone of amide II), and 3305 cm −1 (hydrogen‐bonded NH stretch in the amorphous phase) are also observed for PA6 [Figure (C)].…”

Electreted polyetherimide–silica fibrous membranes for enhanced filtration of fine particles

“…Notice that these methods are difficult-to-control, time-consuming, energyintensive and usually additional species are needed to separate fine particles. Electrospinning, as an alternative to these methods, has emerged as a promising technology in air filtration and water purification devices, mainly owing to the advantageous features of controllable fiber diameter, high porosity, remarkable specific surface area, low packing density, and interconnected porous structure [14][15][16][17][18]. Taking advantage of these intriguing characters, continuous efforts have been made to fabricate electrospun filter media including polyurethane (PU), polyvinyl chloride-PU (PVC-PU), polyacrylonitrile (PAN), and polyamide-66 which have been prepared [19][20][21][22].…”

Fabrication, characterization, and dye adsorption capability of recycled modified polyamide nanofibers

“…3), and their characteristic vibrations peaks are listed in Table 2. Modified PA-nanofiber ( Fig.3C) has two new peaks at 1148.4 and 1038.4 cm -1 which could be referees to the formation of new amide (CO-NH in plane vibration) [43,44]. It is also observed that, the existence of the hydroxyl group of CA lets to broadening and distortion of the absorption peak at 3295 cm -1 .…”