以PPESK为前驱体,CHCl3为溶剂,分别采用冷冻干燥法和冷藏干燥法制备气体分离炭膜,借助于红外光谱、热重分析、X射线衍射和气体渗透等测试手段,研究探讨了干燥方式对聚醚砜酮(PPESK)基炭膜的化学结构、炭微结构及气体分离性能的影响.结果表明,干燥方式对炭膜结构性能的影响主要体现在促使前驱体在干燥过程中形成具有不同化学结构的聚合物膜,使它们在以后的预氧化和低温热解炭化过程中表现出不同的演变规律:与冷藏干燥相比,冷冻干燥得到的聚合物膜在预氧化和炭化过程中分解反应程度较弱,但芳香缩合反应却很深刻,使形成的炭膜微结构尺寸较小,气体分离性能较高,并具有良好的表观柔韧性.所以,采用CHCl3为溶剂制备PPESK炭膜,冷冻干燥将是首选干燥方式.
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