| It is very obvious that bonds influence the mechanical property of the Polymer Bonded Explosives (PBX) greatly. The surface properties of the different kinds of bonds affect their adhesive functions extremely. It is very useful to modify adhesive function of bonds to increase the mechanic and anti-aging properties of PBX. Therefore, the explosive dependability would be increased in long term and new formulations of insensitive high explosives would be developed.The Low Temperature Plasma (LTP) technique develops quickly in recent years and it is adopted to modify the surface properties of many materials. The surface of fluoride rubber material which was modified by the LTP technique was applied in TATB-PBX system. The result showed that the surface modification of the fluoride rubber affected the mechanical property of the PBX greatly.The low temperature plasma gases, such as oxygen, argon and air, were adopted to treat the surface of fluoride rubber under the different conditions. The liquid contact angles on the material surface treated in different time and power in the LTP were measured. The modification was realized by 100 watts, 10 minutes, 60 micro-liters gas flux per minute. Furthermore, the conservation time of the modified material surface was studied. The result showed that the material surface activity would be decreased if the material was taken out of the plasma environment. Because one layer internet membrane on the surface of fluoride rubber F2311 treated by LTP can be formed, the F2311 surface can preserve stable state in long term. It proved that the contact angles on the F2311 surface increased slowly and the surface energy of the F2311 decreased slowly.After the liquid contact angles on the F2311 surface being measured, the surface energy of the F2311 was figured out and contrasted with the surface treated before.Moreover, the treated surface structure was demonstrated by some tests, such as, SEM, FT-IR, XPS, etc. The result showed that the surface of fluoride rubber modified by LTP had many activity groups, such as -C-OH, -C-O-OH. etc. These groups can decrease the liquid contact angle as well as the material surface energy. The modification mechanism which was analyzed implied that the no-polymerization reactive gases, such as oxygen and air, were directly decomposed to free radicals in the LTP environment and these free radicals reacted with the oxygen and made a great deal of groups including oxygen. Furthermore, the modifications in the surface of fluoride rubber included two effects, oxdation and engrave. The no-polymerization no-reactive gas, such as argon, consists of the argon atom. This atom can transfer energy to the material surface and the surface can be brought into new free radicals and the free radicals reacted with each other. These argon atoms influenced the modification by three ways, internet membrane, oxdation, and engrave.The argon plasma was adopted to modify the surface of fluoride rubber with the first treating conditions, 100 watts, 10 minutes, 60 microliters gas flux per minute, and the second treating conditions, 100 watts, 2 minutes, 60 microliters gas flux per minute. Some monomers, such as acrylic acid, acrylic amide, styrene, poly-ethandiol, were adopted to modify the surface of fluoride rubber and some typical tests, such as SEM, FT-IR, XPS, were adopted to characterize the modified surface structure. The result showed that monomers and essences affected the modification greatly. The modification efficacy was the best when the acrylic amide and acrylic acid were adopted together.The acrylic amide and acrylic acid were adopted to modify the surface of fluoride rubber F2314 with the different treating conditions. The modification efficacy in the shorter second treating time was very obvious. This implied that the monomer molecular absorbed on the F23H surface could be decomposed to free radicals when F23H was placed into the LTP environment again. The free radicals can react with the essence molecular to form one layer internet membrane on the... |
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