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Mixed Matrix Membranes Consisting of Porous Polyimide Networks and Polymers of Intrinsic Microporosity for Gas Separation
[Thesis]. Manchester, UK: The University of Manchester; 2017.
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Abstract
This research aimed to develop the fabrication of mixed matrix membranes (MMMs) utilizing a polymer of intrinsic microporosity (PIM-1) with porous polyimide networks, and to explore their effect on gas transport properties. PIM-1 has been chosen as polymer matrix for its high surface area and high sorption of gases. It is also considered as interesting candidate for membrane gas separation. PIM-1 has been synthesized successfully using high temperature methods (40 min, 160 oC) and low temperature methods (72 h, 65 oC). Porous polyimide networks have been chosen as organic fillers as they have good chemical affinity to polymer matrix and can adhere much better than inorganic fillers. MPN-1 and MPN-2 were synthesized by condensation polymerization of A2 (dianhydride) and B4 (tetraamino). The polymer matrix (PIM-1) and network polyimide fillers were characterized using various characterization techniques, including FTIR, NMR spectroscopy, TGA and N2 sorption analysis. MMMs were fabricated successfully utilizing PIM-1 with 10, 20, and 30wt. % loadings of fillers. The MMMs prepared were homogenous on a macroscale. They characterized using different techniques, such as FTIR spectroscopy, powder x-ray diffraction, and scanning electron microscopy. The gas transport properties of MMMs were obtained using a time lag method. The treatment of MMMs with alcohol showed an increase in the permeability and diffusivity of gases. We aimed in this research to increase solubility of microporous polyimide network (MPN-1) by decreasing the extent of network structure. Different strategies have been utilized. First, using different molar ratios and second, using end-capping modification. The polymers were characterized using various techniques, including FTIR, NMR spectroscopy and TGA. Following this, their CO2 uptake and solubility are also examined.