Kim, Seong-Joong Ahn, Yeojin Kim, Jeong F. Nam, Seung-Eun Park, Hosik Cho, Young Hoon Baek, Kyung-youl Park, You-In 2024-01-19T15:31:06Z 2024-01-19T15:31:06Z 2021-09-02 2021-02-15 0021-8995 https://pubs.kist.re.kr/handle/201004/117407 To overcome the plasticization effect in polyimide membranes, many researchers have proposed crosslinking method. This can reduce an inter-segmental mobility by tightening and rigidifying the polymer chains. However, it is difficult to modify the whole polymer chains throughout the membrane because the reaction can be hindered by the diffusion rate of the crosslinker. In particular, it is hard for bulky crosslinker to penetrate a dense membrane with a small d-spacing. This study investigated the effect of crosslinking a dense Matrimid membrane withp-phenylenediamine (p-PDA) via two different crosslinking methods (i.e., methanol-swelling crosslinking process [M-SCP] and liquid-phase crosslinking process [L-PCP]). Most of the crosslinking reaction in M-SCP occurs on the membrane surface due to difficulty in penetration of the bulkyp-PDA into the Matrimid dense membrane. In contrast, the L-PCP allows uniform crosslinking across the membrane. The membranes crosslinked using L-PCP showed excellent chemical resistance. Furthermore, the plasticization phenomenon was not observed in the membranes crosslinked using L-PCP withp-PDA more than 15%. Meanwhile, the membrane crosslinked using M-SCP exhibited poor plasticization and chemical resistance properties. These results showed that the L-PCP method can be more effective for the crosslinking of dense membrane to deliver both high plasticization and chemical resistance. English WILEY MIXED-MATRIX MEMBRANES HOLLOW-FIBER MEMBRANES SEPARATION PERFORMANCE CO2/CH4 SEPARATION PLASTICIZATION-RESISTANCE CO2 PLASTICIZATION BLEND MEMBRANES GAS-TRANSPORT DIAMINE SURFACE Comparison of liquid-phase and methanol-swelling crosslinking processes of polyimide dense membrane forCO(2)/CH(4)separation Article 10.1002/app.49860 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.138, no.7 JOURNAL OF APPLIED POLYMER SCIENCE 138 7 scie scopus 000571199500001 2-s2.0-85091171652 Polymer Science Polymer Science Article MIXED-MATRIX MEMBRANES HOLLOW-FIBER MEMBRANES SEPARATION PERFORMANCE CO2/CH4 SEPARATION PLASTICIZATION-RESISTANCE CO2 PLASTICIZATION BLEND MEMBRANES GAS-TRANSPORT DIAMINE SURFACE crosslinking membranes separation techniques