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Published on: February 23, 2017
Piperazinium-mediated crosslinked polyimide-polydimethylsiloxane (PI-PDMS) copolymer membranes: the effect of PDMS
Hyelim You1,2, Iqubal Hossain1,2, Tae-Hyun Kim1,2
1Organic Material Synthesis Laboratory, Department of Chemistry, Incheon National University Incheon 406-772 Korea tkim@inu.ac.kr +82-32-835-0762 +82-32-835-8232.
Abstract:
We synthesized copolymers consisting mostly of physically stable rigid polyimide (PI) and a low content of highly permeable rubbery polydimethylsiloxane (PDMS), that were crosslinked by CO2-philic ionic piperazinium groups attached to the side chains of the copolymers. These crosslinked copolymers (xPI-PDMSs) were fashioned into membranes that showed very high levels of thermochemical stability and excellent CO2 separation performance (P CO of 799 Barrer and CO2/N2 permselectivity of 15.7). The inclusion of the piperazinium groups not only endowed these xPI-PDMS membranes with increased selectivity for CO2, but also good resistance to CO2 plasticization. The effect of PDMS content on morphology and CO2 separation properties of xPI-PDMS was also investigated.
