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Novel Polyimide Architectures: Towards Membranes with Tunable Transport Properties

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  1. Selectivity of P1 based membranes CO2 Permeability of P1 based membranes Novel Polyimide Architectures: Towards Membranes with Tunable Transport Properties PhD Candidate: ZeljkaMadzarevic Department: ASM Section: Novel Aerospace Materials Supervisor: Theo Dingemans Promoter: Theo Dingemans Start date: 01-10-2011 Funding: DPI Cooperations: MST group, UTwente Membrane technology has proven to be a highly energy efficient technology for the separation of CO2 form natural gas in industrial applications. Polyimides are attractive materials for gas separation owing to their excellent gas separation (high selectivity for gas pairs such as CO2/CH4) and physical properties, such as high thermal stability, high chemical resistance, and mechanical strength. [1] Polyetherimide (PEI) films with ODPA dianhydride moiety (P1-ODPA) have shown high selectivities in experiments at elevated pressures with a 50/50% CO2/CH4 feed gas mixture.[3] Therefore a series of PEIs with slightly different moieties has been designed to be tested and compared to give more information on the effects of molecular structure on their gas separation properties. meta Solution-diffusion mechanism para Feed PMDA Retentate M1 ODPA P1 ortho This is a homologous series, which will enable us to investigate the role of polymer backbone composition on gas transport behaviour The poly(amic acid)s were prepared from dianhydride and diamine monomers in NMP (10 or 15 wt.% solids) at room temperature, filtered and thermally imidized BTDA O1 BPDA GPC results: Average Molecular Weight Table Permeate Thermal analysis results: DSC and TGA Aerospace Engineering The mixed gas permeation behaviour of P1-ODPA II membrane, using 50/50 CO2/CH4 feed composition at 40 bar aCompared to a polystyrene standard. bTg is reported at the inflection point, by DSC (second heat). c Tm is reported as the peak temperature. d Degradation temperature. eTg is not visible in the DSC scan, to be determined by DMTA. [1] Cecopierigomez, M. et al. On the limits of gas separation in CO2/CH4, N2/CH4 and CO2/N2 binary mixtures using polyimide membranes. Journal of Membrane Science293, 53-65 (2007). [2] Xiao, Y.T. et al. The strategies of molecular architecture and modification of polyimide-based membranes for CO2 removal from natural gas — A review. Progress in Polymer Science 34, 561-580 (2009). [3] Simons, K. et al. CO2 sorption and transport behavior of ODPA-based polyetherimide polymer films. Polymer51, 3907-3917 (2010).