Study On The Preparation Of Porous Poly（Ionic Liquid）s And Its Use In The CO₂ Capture

In recent years, a large number of emissions of greenhouse gases CO2, leading to a growing greenhouse effect, causing global climate warming. CO2 capture has become a large research topic. The large number of studies confirm ionic liquids for CO2 capture have good performance.By during polymerization access CO2 as pore-foaming agent, and with independent means of polymerization under N2 atmosphere were compared, to prepare 7 kinds of poly(ionic liquid)s. It was charaeterized by FT-IR, TG, XPS, N2 adsorption/desorption, CO2-TPD and so on and was studied by CO2 absorption method. It proved pore-foaming ability of CO2 and improved CO2 absorption capacity of Poly(ionic liquid)s.According to experimental purposes, two kinds of ionic liquids with double bonds and amino-group, [VAIM]Br-HBr and [SAIM]Br-HBr, was prepared. Then their structures and properties was analyzed and characterized.Based on synthesis ionic liquids above, accessed CO2 as pore-foaming agent with the ionic liquid amino combine to produce carbamate in the polymerization process, and compared with the polymerization under N2 atmosphere. After the reaction, the product was heated under vacuum, so that the carbamate decomposition, restoring amino and geting the following 7 poly(ionic liquid)s:P([VAIM]Br/DVB), P([VAIM]Br/AAM/DVB), P([VAIM]Br/DAA/DVB), P([VAIM]Br/OLA/DVB), P([SAIM]Br/DVB), P([SAIM]Br/DAA/DVB), P([SAIM]Br/OLA/DVB).Then analyzed and characterized the prepared poly(ionic liquid)s’ structures and properties, found synthetic poly(ionic liquid)s with high thermal stability, remained stable at 300℃ before. By nitrogen adsorption-desorption experiments, compared with the polymerization under N2 atmosphere, the poly(ionic liquid)s polymerized under CO2 got greater specific surface area and pore volume. P([VAIM]Br/DAA/DVB)(CO2) has maximum specific surface area is 160.35m2/g and pore volume is 36.85ncc/g. But P([VAIM]Br/DAA/DVB)(N2) is 94.39m2/g for specific surface area and 21.69ncc/g for pore volume. P([SAIM]Br/DVB)(CO2) has minimum specific surface area is 28.11m2/g and pore volume is 6.46ncc/g. And P([SAIM]Br/DVB)(N2) is 21.16m2/g for specific surface area and 4.86ncc/g for pore volume. While compared with the polymerization under N2 atmosphere, the poly(ionic liquid)s polymerized under CO2 absorbed more CO2. P([VAIM]Br/DAA/DVB)(CO2) has maximum absorption of CO2 to 0.277mmol/g than P([VAIM]Br/DAA/DVB)(N2) 14.9% higher P([SAIM]Br/DVB)(CO2) has minimum absorption of C02 to 0.224mmol/g, than P([SAIM]Br/DVB)(N2) 5.2% higher.