以聚二甲基硅氧烷(PDMS)为前驱体聚合物,采用浸渍法在支撑体上涂覆制备PDMS支撑膜,将其在惰性气氛下350～480℃低温热解,制备有机/无机膜.考察了制膜工艺条件对膜气体分离性能的影响;并借助于TG和FT-IR测试手段探讨了PDMS的热解过程及化学结构的变化;采用SEM对有机/无机膜的微观形貌进行表征.研究表明,采用低温热解法可以成功制备出气体分离性能良好的有机/无机膜.该膜既保留了有机膜的柔韧性,又具有无机膜的热稳定性好的优点,并表现出良好的气体渗透性能和选择性.PDMS制膜液的浓度、浸渍次数、复合膜的热解温度及基体孔径和性质等因素对有机/无机膜的气体分离性能以及膜层结构有较大的影响.在最佳工艺条件下制备的有机/无机膜其O2渗透通量为21.2 GPU(1 GPU=7.501×10-12 m3(STP)/(m2·s·Pa)),O2/N2分离系数为2.28.
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