Fabrication of low density p-divinylbenzene foams

In order to meet the requirement of low density micro-machinable CH foams in ICF, the fabrication of p-divinylbenzene foams by high internal phase emulsion(HIPE) have been introduced. The fabrication conditions were discussed, such as initiator, emulsifier, ratio of styrene and inorganic additive. Then the optimum formula was obtained. Characterization results of different density foams indicate that there are two different porous structures in foams: cells and wall holes. The cells have the diameter of 1~10 μm, and wall holes have the diameter of 0.2~2.0 μm. When the density of foams is 50 mg/cm3, the elastic module of foams is about 5 MPa. By the microfabrication, the foams with the density over 50 mg/cm3 could be machined to cylindrical and sliced targets used in ICF, whose minimum si