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Electrospinning nanofibers prepared polyacrylonitrile

Author: ZhangWenJing
Tutor: BaiXuZuo
School: Heilongjiang University
Course: Polymer Chemistry and Physics
Keywords: polyacrylonitrile electrospinning nanofiber preparation
CLC: TQ342.31
Type: Master's thesis
Year: 2011
Downloads: 150
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Abstract


Recently much attention has been placed upon polyacrylonitrile nanofiber due to the unique properties and potential application value. But well-aligned nanofiber bundles is what people often want because the products of the electrospinning are usually in the form of fiberfelt. The aim of the thesis is to prepare uniform diameter and well-ailgned PAN and MWNTs/PAN nanofiber bundles which contain less defact.The ammonium persulfate-tetramethylethylenediamine(APS-TMEDA) redox system was adopted as initiator to synthesize the copolymer that acrylonitrile is the main monomer in the method of aqueous deposited polymerization. This is a way of preparing higher average molecular weight polymer. The MWNTs/PAN graft copolymers was prepared by in-situ polymerization so as to improve the dispersity of MWNTs. The production was investigated though Ubbelohde viscosity meter (UVM), Fourier transform infrared spectroscopy(FTIR),differential scanning calorimeter(DSC), wide angle X-ray diffraction(WAXRD).The PAN and MWNTs/PAN was dissolved in N, N-dimethyl formamide(DMF) as solvent to prepare for spinning solution which was made into nanofibers by electrospinning. The electrospining conditions and technological parameter was investigated in order to prepare high quality fibers. Different receiving devices were employed. The effect of rotary collector and rotary speed on aligned fibers collection were discussed. The influences of electrospining conditions on diameter and morphology of electrospinning nanofibers were studied by way of scanning electron microscope(SEM) and Transmission Electron Microscope(TEM). A variety of characterization methods were carrier out to investigate the difference in the structure,functions,surface,diameter and diameter distribution of nanofibers before and after MWNTs were addeded.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Polyacrylonitrile Department of fibers > Polyacrylonitrile fibers ( acrylic )
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