聚醚共聚酰胺/聚乙二醇共混膜的制备及其气体渗透性能的研究  

Preparation of poly(amide-12-b-ethylene oxide)/polyethylene glycol blend membrane and its permeation properties

作　　者：冯世超[1] 任吉中[1] 任晓灵[1] 李晖[1] 花开胜[1] 邓麦村[1] 

机构地区：[1]中国科学院大连化学物理研究所膜技术国家工程研究中心,大连116023

出　　处：《膜科学与技术》2012年第5期27-33,共7页Membrane Science and Technology

基　　金：国家科技支撑计划(2011BAC08B00)

摘　　要：以聚醚共聚酰胺(Pebax1074)嵌段共聚物和分子量为400的聚乙二醇(PEG400)为膜材料,采用聚合物共混和流延成膜的方法,制备出不同质量比的均一透明Pebax1074/PEG400共混均质膜.PEG400作为塑化剂与Pebax1074共混之后,改变了聚合物链段的活动性,增加了醚氧键的含量,使N2、H2、CH4和CO2渗透系数以及CO2对其它气体的选择性都得到了增加.操作条件对气体在共混膜中的渗透性能也有较大的影响.由于塑化效应的作用,膜两侧的压差对CO2和非极性气体的渗透系数影响不同,并且随共混膜中PEG400含量的变化而变化.气体在共混膜中的渗透系数随操作温度的升高而增大,通过Arrhenius方程可把渗透通量与温度联系起来.Block copolymer poly （amide-12-b-ethylene oxide） （Pebax1074） and polyethylene glycol （PEG400） are used to prepare dense Pebax1074/PEG400 blend membranes with different mass ratio by polymer blending and casting method. PEG400 as a plasticizer, it can increase polymer chain flexibility and EO units, resulting in the increase in gas permeability and selectivity of CO2/light gas. The operating conditions also influence the performance of Pebax1074/PEG400 blend membranes. Due to hydrostatic pressure and plasticization effect, the gas permeability of N2, CH4, H2 and CO2 changes differently with the increase in transmembrane pressure. The permeability of different gases increases as temperature increasing, the temperature dependence of gas permeability is correlated with the apparent activation energy of permeation according to Arrhenius equation.

关 键 词：聚醚共聚酰胺 聚乙二醇 共混膜 二氧化碳分离 

分 类 号：TQ028.8[化学工程]