以商用聚醚酰亚胺（PEI）作为前驱体,采用经过ZrO2-Al2O3复合溶胶修饰的陶瓷氧化铝为支撑体,浸渍涂膜制备聚合物膜,在空气中预氧化处理后,经500～800℃不同的炭化温度下制备出气体分离炭分子筛膜。为了考察炭化温度对炭膜结构和气体分离性能的影响,采用热重分析（TG）、拉曼光谱（Raman）、X射线衍射（XRD）、扫描电镜（SEM）和气体渗透等测试手段,对热解过程聚合物膜热稳定性、炭微晶结构及石墨化进程、微观形貌和气体分离性能进行了系统研究。结果表明,不同的炭化温度对所形成炭膜表现出不同物理和化学结构、炭结构和孔结构,最终影响炭分子筛膜的气体渗透性和分离选择性。
A-type carbon molecular sieve gas separation membranes were synthesized at different pyrolysis temperatures of 500-800℃ by dip-coating a commercial polyetherimide（PEI） precursor on a porous ZrO2-Al2O3 composite sol-modified alumina support and further treated by pre-oxidation in air.To investigate the influence of carbonization temperature on the carbon membrane structure and gas separation performance,thermal gravimetric analysis（TG）,Raman spectroscopy（Raman）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and gas permeability tests were employed to systematically study thermal stability of polymer film during the pyrolysis,carbon microcrystalline structure and graphitization evolution,surface morphology studies and gas separation properties.The results indicated that the carbon membranes derived from different carbonization temperatures possessed the different physical and chemical structure,carbon structures and pore structure,which affected the permeability and selectivity of the carbon molecular sieve gas separation membranes.
参考文献
| [1] | Wang DL.;Li K.;Teo WK. .Preparation of asymmetric polyetherimide hollow fibre membrane with high gas selectivities[J].Journal of Membrane Science,2002(1/2):419-426. |
| [2] | 王同华,呼立红,刘庆岭,刘诗丽,王震,丁孟贤.预氧化处理对聚醚酰亚胺基炭膜结构与气体分离性能的影响[J].新型炭材料,2008(03):264-268. |
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