低密度聚环己基乙烯泡沫的制备

低密度CH聚合物多孔材料是惯性约束聚变(ICF)的重要靶材料,利用热致相分离原理对低密度聚环己基乙烯泡沫的制备进行了研究。首先通过聚苯乙烯(PS)氢化反应制备了聚环己基乙烯(PVCH),经过溶剂选择,确定以环己烷/1,4-二氧六环为溶剂体系,经热致相分离和冷冻干燥技术制备出低密度PVCH泡沫。通过分析溶液浓度对泡沫密度的影响,确定了泡沫密度与聚合物溶液质量浓度之间的关系,在0.04~0.15 g/cm3范围之内可实现对泡沫密度的有效控制。泡沫孔结构测试结果表明随着密度的增加,平均孔径有升高的趋势,孔径分布趋于单一化,孔径范围为23.63~0.83μm。

Fabrication of low density poly(vinylcyclohexane) foams

The preparation of poly(vinylcyclohexane) (PVCH) foam has been investigated via the thermally-induced phase separation technique and the freeze-drying technique. Polystyrene was saturated using heterogeneous hydrogenation techniques to prepare PVCH. Then low density foams were successfully prepared with the cyclohexane/dioxane solvent and a series of PVCH solutions with different concentrations, by the thermally-induced phase separation technique and the freeze-drying technique. The relation between polymer concentration and foam density was analyzed. The results show that polymer concentration has a good linear relationship with the actual density of PVCH foams and there is a fixed difference between the actual density and theoretic density, thus effectual control on the density of foams