Comparison of liquidphase and methanolswelling crosslinking processes of polyimide dense membrane for CO2/CH4 separation
- Comparison of liquidphase and methanolswelling crosslinking processes of polyimide dense membrane for CO2/CH4 separation
- 백경열; 안여진; 김성중; Jeong F. Kim; 남승운; 박호식; 조영훈; 박유인
- Issue Date
- Journal of applied polymer science
- VOL 138, NO 7, 49860
- To overcome the plasticization effect in polyimide membranes, many researchers have proposed crosslinking method. This can reduce an intersegmental 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 dspacing. This study investigated the effect of crosslinking a dense Matrimid membrane with pphenylenediamine (pPDA) via two different crosslinking methods (i.e., methanolswelling crosslinking process [MSCP] and liquidphase crosslinking process [LPCP]). Most of the crosslinking reaction in MSCP occurs on the membrane surface due to difficulty in penetration of the bulky pPDA into the Matrimid dense membrane. In contrast, the LPCP allows uniform crosslinking across the membrane. The membranes crosslinked using LPCP showed excellent chemical resistance. Furthermore, the plasticization phenomenon was not observed in the membranes crosslinked using LPCP with pPDA more than 15%. Meanwhile, the membrane crosslinked using MSCP exhibited poor plasticization and chemical resistance properties. These results showed that the LPCP method can be more effective for the crosslinking of dense membrane to deliver both high plasticization and chemical resistance.
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