Highly Carboxylate-Functionalized Polymers of Intrinsic Microporosity for CO2-Selective Polymer Membranes

作者：Jeon Jun Woo; Kim Dong Gyun; Sohn Eun ho; Yoo Youngjae; Kim Yong Seok; Kim Byoung Gak^*; Lee Jong Chan^*

来源：Macromolecules, 2017, 50(20): 8019-8027.

DOI：10.1021/acs.macromol.7b01332

Carboxylate-functionalized polymers of intrinsic microporosity (PIMs) are promising materials for gas separation application. However, highly carboxylate-functionalized PIMs (HCPIMs) have not been reported owing to overlooked intermediate products. Herein, we successfully prepared HCPIMs (similar to 92 mol % of carboxylic acid group) through a prolonged alkaline hydrolysis process (360' h). HCPIMs were found to be soluble in various organic solvents, such as tetrahydrufuran and ditnethyl sulfoxide, and then freestanding HCPIM membranes could be prepared by the common solution casting method: The. HCPIM membranes were found to have smaller interchain distances and higher CO, affinity than original PIM-1 films. For example, small gas molecules,:such as carbon.dioxide, were effectively separated due to the, enhanced diffusivity selectivity combined with the smaller cavity size. Further, strong interactions between carbon dioxide and the carboxylic acid groups increased solubility selectivity. These:synergetic effects endowed the HCPIM membrane with a selectivity of 53.6 for CO2/N-2 separation, the highest among reported chemically modified PIMs.

• 出版日期2017-10-24