Morphological Study of Polyimide Mixed Matrix Membranes
AbstractPolyimide mixed matrix membranes (MMMs) were synthesized by incorporating different fillers of zeolite 4A, carbon molecular sieve, and homemade carbon nanotubes into Matrimid 5218 and P84 via solution casting method. MMMs were characterized by Scanning Electron Microscopy (SEM), Differential Scanning Calorimeter (DSC) and Thermo Gravimetric Analysis (TGA). Effects of fillers loading and polymer concentration on MMMs structure and thermal treatment on removing MMMs probable defects were investigated. The experimental results showed that filler particle size, nature and polymer concentration have significant effects on filler distribution inside the polymer matrices. Incorporation of fillers inside the polymers resulted in polymer free volume reduction and polymer chain attachment to and/or entrance into fillers pores and more glassy (brittle) MMMs as can be concluded by DSC and TGA analysis. Thermal treatment was found as an effective method for removing probable defects inside the MMMs.
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