低密度对二乙烯基苯泡沫的优化制备

Fabrication of low density p-divinylbenzene foams

针对惯性约束聚变(ICF)物理实验对具有微加工能力低密度CH泡沫材料的需求,介绍了对二乙烯基苯泡沫的高内相乳液(HIPE)法制备工艺,并讨论了引发剂含量、乳化剂含量、苯乙烯的比例和无机添加剂等对泡沫形貌结构的影响,获得了低密度对二乙烯基苯泡沫的优化制备配方。不同密度对二乙烯基苯泡沫的形貌结构、力学性能和加工性能的表征结果表明:所得泡沫由开孔状球形孔构成,球形孔的直径在1～10μm之间,孔壁上具有直径为0.2～2.0μm的圆形孔洞结构;在密度为50mg/cm3时,泡沫具有5MPa的弹性模量;通过微加工技术能够获得ICF所需柱状和片状低密度泡沫微靶样品,样品最小尺寸可达100μm。

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 size can run up to 100 μm.