Matrimid作为目前应用于气体分离领域中最为广泛的商业聚酰亚胺材料之一，其气体分离选择性能优异，但渗透性能有待提高。为改善其性能，采用国产新型Matrimid聚酰亚胺材料成功制备出气体分离膜，其CO₂通量为5.3 GPU，选择性为12.9。采用与PPSU共混方法对其进行改性，并在此基础上进行涂覆改性，以期进一步提高其性能。结果表明，PPSU与Matrimid共混制备的分离膜的CO₂通量增长了241%，达到18.1 GPU，选择性为24.7，增长了91%；而经PDMS表面涂敷后，CO₂的通量为9.2 GPU，较原膜增加了73%，其选择性上升到38.6，增长了200%。因此，涂覆后膜的整体性能得到显著提升。

Matrimid,as a commercial polyimide material,is widely employed to prepare gas separation membranes.Although Matrimid has an excellent gas selectivity for gas separation,its permeation performance needs to be enhanced.In order to improve the overall performance,a Matrimid gas separation membrane is prepared by using China-made new-type Matrimid polyimide materials.The flux of CO₂ and the selectivity of CO₂/N₂ by this membrane can reach 5.3 GPU and 12.9,respectively.To improve its permeation performance and selectivity,the membrane is firstly modified by blending with PPSU and then modified by surface coating.Due to the better mechanical strength and gas permeability,PPSU and PDMS were applied as modified materials。After blending Matrimid with PPSU,the selectivity of blended membrane increases to 24.7,almost twice that of the original one.Simultaneously,CO₂ flux reaches 18.1 GPU,an increase of 241%.As for PDMS coated membrane,the selectivity of CO₂/N₂ is 38.6,representing an increase of 200% than the original membrane,and the flux of CO₂ is 9.2 GPU,an increase of 73%.In general,after modification,the overall performance of Matrimid polyimide membrane is improved greatly.

沈子琦(1994-),男,硕士研究生,研究方向为气体分离膜制备,szq789@163.com