芴基微孔聚酰亚胺薄膜的制备和气体分离性能研究  

Preparation and gas separation performance of fluorene-based microporous polyimide membranes

作　　者：闻芯君 贾宏葛[1] Wen Xinjun;Jia Hongge(Heilongjiang Province Key Laboratory of Polymer Matrix Composites,School of Chemistry and Chemical Engineering,School of Materials Science and Engineering,Qiqihar University,Qiqihar 161006)

机构地区：[1]齐齐哈尔大学化学与化学工程学院,材料科学与工程学院,黑龙江省聚合物基复合材料重点实验室,齐齐哈尔161006

出　　处：《化工新型材料》2023年第9期91-95,共5页New Chemical Materials

基　　金：黑龙江省重点研发计划指导类项目(GZ20210034)。

摘　　要：聚酰亚胺的分子链规整性好、链间相互作用力强,但是气体透过偏低,为解决该问题,通过引入芴基致孔基元,利用含芴基结构的9,9-双(4-氨基苯基)芴(FDA)、9,9-双(4-氨基-3-氟苯基)芴(FFDA)和2,2-双[4-(4-氨基苯氧基)苯基]丙烷(BAPP)为单体,制备了一系列自具微孔聚酰亚胺膜(PIM-PI)。结果表明:随着致孔基元比例增加,与无致孔基元的纯膜相比,PIM-PI膜的气体分离性能改善显著。例如6FDA-FFDA/BAPP(8∶2)膜表现出优异的分离性能,CO_(2)渗透率为165.46Barrer和CO_(2)/CH_4选择系数为31.65,相较于纯膜,分别增加7.45倍和1.66倍。引入芴基致孔基元的微孔聚酰亚胺膜显著地提高了气体渗透率。Polyimide has good molecular chain regularity and strong inter-chain interaction force,but it has low gas permeability.In order to solve this problem,a series of polyimides of intrinsic microporosity(PIM-PI)membranes were prepared by introducing fluorene-based pore-forming elements and using 9,9-bis(4-aminophenyl)fluorene(FDA),9,9-bis(4-amino-3-fluorophenyl)fluorene(FFDA)and 2,2-bis[4-(4-aminophenoxy)phenyl]propane(BAPP)containing fluorene-based structure as monomers.The experimental results showed that the gas separation performance of PIM-PI membranes improved significantly with increasing the proportion of pore-forming elements compared with the pure membranes without pore-forming elements.For example,the 6FDA-FFDA/BAPP(8∶2)membrane exhibited excellent separation performance with CO_(2)permeability of 165.46 Barrer and CO_(2)/CH4 selection coefficient of 31.65,which increased by 7.45 and 1.66 times,respectively,compared with the pure membrane.These results indicated that the introduction of fluorene-based pore-forming elements significantly improved the gas permeability of the microporous polyimide membrane.

关 键 词：自具微孔 致孔基元 聚酰亚胺 气体分离膜 气体分离性能 

分 类 号：TQ3[化学工程]