Research Of Micro-Sized Polyacrylonitrile Characteristic Targets Fabrication Based On Microfluidic Device And Carbonization

Under the premise of preparation of eligible pellets, Inertial confinement fusion (ICF) is the most basic way to work out the energy crisis. Hollow polymer microspheres occupy an important place in the pellet preparation. Polyacrylonitrile (PAN) microspheres get attention because of low deuterium tritium permeability and high tensile strength. In this paper, the preparation conditions and properties of micro-sized PAN spheres (200-400μm) using microfluidic device were investigated and the conditions of PAN carbonized spheres with heat treatment were also studied. The fabrication of PAN spheres using nitromethane solution system was also explored in the last part of this paper.The particular contents of this paper are as follows:1) Fabrication of micro-sized PAN spheres (200-400 um):the surface roughness, the sphercity and the uniformity of the thickness of PAN spheres using microfluidic device are obviously superior to the PAN spheres with stirring method; solution filtration and low humidity can improve surface finish of PAN sphere; the influence of the changes of the flow speed and silicon oil viscosity on the PAN microspheres; the influence of different exchange times on the residual silicon oil during CO2 supercritical drying. (Chapter Two)2) Fabrication of PAN-based carbonized spheres:explored the optimal pre-oxidized conditions of PAN spheres; carbon spheres by varying the carbonized temperature were characterized by FT-IR spectroscopy, Raman scattering, electron microscope, pressure-resistant, gas-storage performance and measured by VMR microscope, the White-light interference microscopy, explored the influence of carbonization temperature rate on gas-storage performance of PAN-based carbonized spheres and cooling rate on the structure of carbon balls; the thickness reduction, surface roughness, density and conductive property of the carbonized PAN microspheres were also measured. (Chapter Three)3) Fabrication of PAN spheres using nitromethane solution system:explored the experiment conditions of PAN double emulsions derived from the microencapsutation technique. And PAN balls could be made by the double-nozzle emulsion particle generator preliminary, in spite of poor sphercity and uniformity of the thickness. (Chapter Four)...