Electrospun Silicon Oxycarbide Ultrafine Fibers Derived from Polycarbosilane

doi:10.15541/jim20170153

Abstract

Abstract:

Silicon oxycarbide (SiOC) ultrafine fibers with uniform distribution were prepared via electrospinning of polycarbosilane (PCS)/polystyrene followed by oxidation and pyrolysis at 1100℃. The diameter of SiOC fibers ranged from 500 to 900 nm through adjusting PCS concentration. The average tensile strength of SiOC fiber mat was 8.88 MPa. The obtained SiOC fibers also displayed outstanding thermal stability and chemical resistance, making them promising materials as smart filters and catalyst supports in harsh environment.

Key words: electrospinning, polycarbosilane, silicon oxycarbide, ceramic fibers

CLC Number:

TQ174

WU Nan, WAN Lynn Yuqin, WANG Ying-De, FRANK KO. Electrospun Silicon Oxycarbide Ultrafine Fibers Derived from Polycarbosilane[J]. Journal of Inorganic Materials, 2018, 33(3): 357-362.

Figures/Tables 5

Fig. 1 SEM images of (a) as-spun PS/PCS fibers without SDS, (b) as-spun PS/PCS fibers with SDS, (c) pre-oxidized PS/PCS fibers, and (d) SiOC-15 fibers after pyrolysisInsets are the corresponding digital pictures

Fig. 2 SEM images, diameter distribution and corresponding EDS spectra of (a, b) SiOC-9, (c, d) SiOC-15 and (e, f) SiOC-21

Fig. 3 (a) XPS survey, (b) C1s, (c) Si2p and (d) O1s spectra of SiOC-15

Fig. 4 Tensile strength of SiOC-9, SiOC-15 and SiOC-21. The right of pictures are the corresponding SEM images of breaking section

Fig. 5 Stability test results(a) TGA curve of SiOC-15 in air, with inset showing SEM image after heating at 500℃ in air for 1 h; (b) SEM image of SiOC-15 after immersing in 1 mol/L H2SO4 solution at 90℃ for 36 h; (c) SEM image of SiOC-15 after immersing in 6 mol/L KOH at 90℃ for 36 h; (d) XRD patterns of SiOC-15 after different treatments

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