不同干燥方式对聚醚砜酮基炭膜的影响  

Effect of Different Drying Methods on PPESK Carbon Membrane

作　　者：庞婧[1] 王同华[1] 李琳[1] 祁文博[1] 曹义鸣[2] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,炭素研究室,大连116012 [2]中国科学院大连化学物理研究所,大连116023

出　　处：《无机材料学报》2011年第2期165-169,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(20776024,20976021,20836006);国家863项目(2009AA03Z215)~~

摘　　要：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.The carbon membranes derived from the PPESK precursor in CHCl3 solvent for gas separation were pre-pared with freezing and refrigeration drying methods.The influences of drying methods on the structure and gas sepa-ration performance of PPESK carbon membranes were investigated.FTIR,TG,XRD and gas permeation tests were used to characterize the change of chemical and carbon structure and gas separation properties of carbon mem-branes prepared with different drying methods.The result indicated that the effects of drying methods on the struc-ture and performance of PPESK carbon membranes are to promote the precursor to form a polymeric membrane with the different chemical structure during the drying and make the chemical structure of derived polymeric mem-branes change in different ways during the later preoxidation and carbonization.Compared with refrigeration drying,the freezing drying weakened decomposition reaction and promoted condensation reaction during preoxidation and carbonization.As a result,the frozen membrane exhibited a better gas separation performance with a good flexility due to its dense microstructure.The freezing drying was the optimum way to prepare PPESK carbon membranes using CHCl3 as solvent.

关 键 词：聚醚砜酮 炭膜 干燥方式 气体分离 

分 类 号：O643[理学—物理化学] O626[理学—化学]