氨基类型对PDMS复合膜CO2分离性能的影响OA

The greenhouse effect tended to be more serious due to the excessive CO2 emissions.How to efficiently separate CO2 mixtures is one of the research hotspots.In this paper,polydimethylsiloxane(PDMS)was used for the membrane fabrication,PDMS-APTES and PDMS-BTPA composite mem-branes were prepared by the polymerization between PDMS and(3-aminopropyl)triethoxy silane(APTES)or bis(3-triethoxysilylpropyl)amine(BTPA).The effect of the coating times for separa-tion layer on the performance of PDMS-APTES composite membrane was investigated.The gas test results showed that CO2 permeance decreased while the CO2/N2 selectivity increased as the increased coating times.The optimum mass ratio of BTPA and PDMS in the casting solution of the separation layer was investigated,and the optimum performance of the composite membrane was determined when m(BTPA)∶m(PDMS)=2∶1.Finally,the effects of primary amine(APTES)and secondary amine(BTPA)on the performance of the composite membranes were discussed.Due to the differ-ences in the affinity of primary and secondary amine for CO2 and the interaction between molecular a-mines,the CO2 permeance and CO2/N2 selectivity of PDMS-BTPA membrane increased by 2.5 times in comparison with PDMS-APTES composite membrane.