Preparation Of Double-layer Hollow Plastic Microspheres And Doping Research

Compared with the Nuclear Fission, Nuclear fusion is more environmentally friendly way to obtain energy, and the raw materials are almost inexhaustible. By far, the most studied way to achieve Nuclear Fusion reaction is inertial confinement Fusion (ICF), which used laser and charged-particle beam as energy carrier to irradiation the vessel of deuterium-tritium (DT), and then initiate Nuclear Fusion reaction. The size, chemical properties and materials of vessel affect the absorption and coincidence of laser, the uniformity and the symmetry of implosion compression. Therefore, the preparation of vessel is a very important step in the study of ICF.At present, in the study of ICF, vessel mainly includes hollow glass microspheres and hollow plastics microspheres. In the experiment of ICF, hollow glass microspheres have been limited because of their components, thus the more applications is the light plastics target based on (CH) polymer, and the multilayer hollow plastics microspheres is especially important in the experiment of ICF.In this paper, polystyrene hollow microspheres with diameter, wall thickness, sphericity and uniformity of wall thickness that meet the requirement for the experiment of ICF were fabricated using the random copolystyrene as raw material by microencapsulation method, and the factors which affect the diameter distribution, surface finish and the wall thickness of the microspheres were studied in detail. Meanwhile, on this basis, PS-PVA hollow microspheres with diameter in range of 200-450μm, wall thickness of polystyrene layer in range of 4-10μm, wall thickness of PVA layer in range of 2-6μm and well surface finish were fabricated. The PS-PVA hollow microspheres with large target specification were also studied, and some prophase works were finished. The factors which affect the microspheres were analyzed, and the microspheres with diameter in range of 450-900μm, uniform wall thickness of PVA layer were obtained by surface modification technology.In this paper, the method of fabricating inner-S-doped polystyrene hollow microspheres was studied due to the doped hollow plastics microspheres is required in tracer experiment of ICF, and the instability factors in the S-doped layer was analyzed. Meanwhile, the method of fabricating inner-gold-doped polystyrene hollow microspheres were studied, the feasibility and the technologic barriers of the route were described in detail to lay the foundation for the fabrication of the inner-gold-doped plastics target.The innovation of this paper is:1) Factors affecting the size distribution and surface finish of the polystyrene hollow microspheres were researched; 2) Surface of the resulting polystyrene hollow microspheres was modified to solute the problem of delamination during the fabrication of multilayer hollow plastics microspheres; 3) PS-PVA hollow microspheres with diameter in range of 450-900μm were fabricated for the first time. Increasing the uniformity of wall thickness and survival rate of microspheres by optimize the conditions of experiment.4) The effect on the instability of S-doped target was ensured to the orderly arrangement and the crystalline precipitate of the doped materials; 5) Infrared microscopy was used in the fabrication of two components, heterogeneous, hollow microspheres, and achieved very good result.The result of this paper was significance for increasing the rapid response capability of fabricating ICF target, and of great reference value for fabricating multilayer plastic target for ICF and the development of the technology of doped target.