以商用PMDA-ODA型聚酰胺酸为涂膜液,采取旋转涂膜技术在煤基板状炭膜支撑体上制备成C/C复合膜.研究了旋转涂膜次数、支撑体性质、支撑体表面预浸渍处理及加入表面改性剂对C/C复合膜气体分离性能的影响,采用扫描电镜对炭膜的复合效果和微结构进行表征.结果表明:随着旋转涂膜次数的增加,气体的渗透速率下降、分离系数增加;与无烟煤支撑体相比,以烟煤支撑体制备的C/C复合膜气体渗透速率和分离系数均较大;无烟煤支撑体经预浸渍处理后可以提高C/C复合膜的气体渗透速率;涂膜液中加入表面改性剂可以改善涂膜液和支撑体的复合效果,经一次涂膜即可制备出具有分子筛分性质的C/C复合膜.以烟煤为支撑体制备的C/C复合膜对H2/N2、CO2/N2和O2/N2的分离系数分别为94.3、18.3和10.2;空气中O2/N2分离系数为10.8,氧气的渗透速率为4.99×10-9 mol·m-2· s-1· pa-1,一次富集氧气浓度达到74.4%.
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