Poly(p‐phenylene sulfide) nanofibers prepared by CO₂ laser supersonic drawing

Abstract

Poly(p‐phenylene sulfide) (PPS) nanofibers are prepared by irradiating a PPS fiber with a carbon dioxide (CO2) laser while drawing it at supersonic speeds. A supersonic jet is generated by blowing air into a vacuum chamber through the fiber injection orifice. Nanofibers obtained at a laser power of 30 W and chamber pressure of 10 kPa exhibit an average diameter of 600 nm and a draw ratio of 110,000. Scanning electron microscopy, differential scanning calorimetry, and wide‐angle X‐ray diffraction analyses are employed to investigate the relationships among the chamber pressure, fiber morphology, and crystallization behavior. The nanofibers exhibit two melting temperatures (Tm): approximately 280°C and 320°C. The endothermic peak at Tm = 280°C is ascribable to lamellar crystals and that at Tm = 320°C to the highly complete crystals, since the polymer molecular chain is highly oriented. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40922.

Mechanical properties of poly(ethylene terephthalate) nanofiber three‐dimensional structure prepared by CO2 laser supersonic drawing

“…22,23,26 The NFs produced by CLSD thus exhibit T m2 , which is a unique feature. 22,23,26 The NFs produced by CLSD thus exhibit T m2 , which is a unique feature.…”

“…In this estimation, a value of 1.455 g cm 23 was assumed for q c , and a value of 1.335 g cm 23 was assumed for q a . In this estimation, a value of 1.455 g cm 23 was assumed for q c , and a value of 1.335 g cm 23 was assumed for q a .…”

“…CLSD employs only CO 2 -laser irradiation and does not require additional processes or solvents, unlike electrospinning, [12][13][14] which requires a solvent, or sea-island-type conjugated melt spinning that requires the removal of a second component. 23 Not only the NF sheet 24 but also a fluffy NF is prepared by changing the collecting method of the NF in CLSD apparatus. 23 Not only the NF sheet 24 but also a fluffy NF is prepared by changing the collecting method of the NF in CLSD apparatus.…”

Crystal growth of PPS nanofibers during annealing studied by solid‐state 13C CPMAS NMR

“…The orientation of the crystalline phase of PPS nanofibers after heating at 220°C for 15 min inside the two hot aluminum plates with a high compression was also investigated by the wide‐angle X‐ray diffraction (WAXD) and the scanning electron microscopy (SEM) micrographs. The increase of the intensity of the broad 111/200 WAXD diffraction peak and the decrease of the distribution of fiber diameters indicated that the higher orientation was formed with lower p ch 6 . Although the information about crystallinity and orientation has been investigated for both pristine PPS nanofibers and PPS nanofibers after heating at very high temperature, the growth and the packing processes for the crystalline phase during annealing at relatively low temperature are still indefinite.…”

Poly(l-lactic acid) nanofiber multifilament prepared by carbon dioxide laser supersonic multi-drawing

“…CLSD employs only CO 2 laser irradiation and does not require additional processes or solvents, unlike electrospinning, which requires a solvent, or sea-island-type conjugated melt spinning that requires the removal of a second component. CLSD has already been applied to prepare NFs of poly(L-lactic acid) (PLLA) [24], poly(ethylene terephthalate) (PET) [25], poly(ethylene-2,6-naphthalate) [26], poly(glycolic acid) (PGA) [27], ethylene tetrafluoroethylene copolymer [28], nylon 66 [29], and poly(phenylene sulfide) [30].…”