超低密度TAC泡沫制备中的干燥工艺研究

摘要

By using TAC as raw materials, TAC polymer foams with ultra-low density were prepared by frozen drying and supercritical drying processes. The research results show that the volume shrinkage of the foams prepared by supercritical drying process is much lower than that of the foams prepared by frozen drying process. The SEM results indicate that the TAC foams prepared by both the two methods have open net-work mi-crostructure, and the foams prepared by supercritical drying process have smaller pore diameter and more uniform microstructure. This kind of ultra-low density foams is hopeful for ICF and Z-pinch material applications.%以三醋酸纤维素(TAC)为原料,通过热致凝胶工艺,采用冷冻干燥和超临界干燥两种不同的干燥工艺制备了超低密度TAC泡沫.研究结果表明,采用超临界干燥工艺制备的TAC泡沫,在干燥过程中的体积收缩明显小于采用冷冻干燥过程制备的TAC泡沫.扫描电子显微镜(SEM)测试结果表明,采用超临界干燥工艺制备的泡沫具有更加细小的微孔结构、更加均匀的微观结构.该类超低密度聚合物泡沫有望在激光惯性约束聚变及Z箍缩驱动聚变实验中得到应用.