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Carbonization of Electrospun Polyimide/f-Multiwalled Carbon Nanotubes Nanofiber Webs by RF-Induction Heating

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This study reports carbonization of electrospun polyimide nanofiber webs reinforced with acid-functionalized multiwalled carbon nanotubes, and the effect of carbonization and CNT-reinforcements on their electrical conductivity. Pyromellitic dianhydride (PMDA), 4,4′-Oxydianiline (ODA) and 4,4′-(4,4′-isopropylidene diphenyl-1,1′-diyl dioxy) dianiline (IDDA) were copolymerized in Dimethyl formamide (DMF) solvent to form a viscous poly (amic acid) (PAA) solution. The PAA solutions were prepared with incorporation of acid functionalized MWCNTs (0, 1 and 2 wt%). The PAA solution was electrospun into nanofiber web and was heated up to 300 °C for imidization to form polyimide (PI) nanofiber web. In this study, radio-frequency induction heating method was utilized to carbonize the nanofiber web by heat treatment at 900 and 1000 °C under nitrogen atmosphere and the yield decreased from 54% at 900 °C to 51% at 1000 °C. The carbonized nanofiber (CNF) webs were characterized by Fourier Transform Infrared spectroscopy, Raman spectroscopy, X-ray diffractometer and scanning electron microscopy. The tensile strength of PI/f-MWCNT (2 wt%) nanofiber web increased twice of neat PI nanofiber web. The electrical conductivity of CNF webs increased mildly with increasing heat treatment temperature, viz., 2.21 and 2.28 S/cm, for CNF at 900 and 1000 °C respectively. This conductivity increased to 5.73 and 16.90 S/cm for CNF with 1% f-MWCNT and CNF 2% f-MWCNT at 1000 °C respectively.
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Keywords: CARBON NANOFIBER; ELECTRICAL CONDUCTIVITY; POLYIMIDE NANOFIBER; RADIO-FREQUENCY INDUCTION HEATING; SCANNING ELECTRON MICROSCOPY

Document Type: Short Communication

Publication date: June 1, 2015

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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