Preparation and Characterization of Polyimide Fibers

PI fibers used in the present research work were mainly prepared by Changchun HiPolyking Co. Ltd., China. Simply, PI fibers used in the present research were obtained by a two-step method that involves reacting dianhydride and diamine monomers in the wet-spinning process. Pyromellitic dianhydride and 3,4′-oxydianiline were crosslinked with 0.5 wt% N,N-dimethylacetamide; the resulting fibers were treated by annealing, rapidly cooled with water and then stretched to the final forms. The main structure of PI fibers is shown as Fig. 1 A and identified by FESEM, EDS, and FTIR. Field-emission scanning electron microscopic (FESEM) images^{35 (link)} and energy-dispersive X-ray spectroscopy (EDS) mappings were obtained using a JEOL-7800F field emission scanning electron microscope equipped with an energy-dispersive X-ray spectrometer operating at 10 kV.^{36 (link)} Fourier transform infrared (FTIR) spectra were recorded using a Nicolet-5700 FT-IR spectrometer (Thermo Electron Corporation, USA),^{37 (link)} in a test range of 4000–500 cm⁻¹ and a resolution of 4 cm⁻¹.

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Yang X., Ma W., Lin H., Ao S., Liu H., Zhang H., Tang W., Xiao H., Wang F., Zhu J., Liu D., Lin S., Zhang Y., Zhou Z., Chen C, & Liang H. (2022). Molecular mechanisms of the antibacterial activity of polyimide fibers in a skin-wound model with Gram-positive and Gram-negative bacterial infection in vivo. Nanoscale Advances, 4(14), 3043-3053.

Publication 2022

Nicolet-5700 FT-IR spectrometer

Diamine Dimethylacetamide Electron Energy dispersive x ray spectroscopy Pyromellitic dianhydride Scanning electron microscope X ray

Corresponding Organization : Daping Hospital

Other organizations : Southwest University, Shanghai University, Institut Pasteur of Shanghai, Chinese Academy of Sciences

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Variable analysis

independent variables

Composition of the PI fibers (pyromellitic dianhydride and 3,4′-oxydianiline)
Annealing treatment
Stretching of the fibers

dependent variables

Morphology and structure of the PI fibers (as observed through FESEM, EDS, and FTIR)

control variables

Concentration of N,N-dimethylacetamide used as a crosslinking agent (0.5 wt%)

controls

No positive or negative controls were explicitly mentioned in the given information.

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