Abstract
Gas transport properties of five new fluorinated poly(ether imide) (PEI) films containing cardo phthalimidine moiety in the main chain were systematically investigated at three different temperatures (35, 45 and 55 °C) under an applied upstream pressure of 3.5 bar. The effect of presence of the cardo phthalimidine unit and structural variations of five aromatic dianhydrides in these poly(ether imide) (PEI) films towards the gas permeation of four gases (e.g., CO 2 , O 2 , N 2 and CH 4 ) and their permselectivity for pair of gases were investigated. The films were prepared by the thermal imidization of the poly(amic acid)s of the reaction products of a new fluorinated diamine, 3,3-bis-[4-{2′-trifluoromethyl 4′-(4″-aminophenyl)phenoxy}phenyl]-2-phenyl-2,3-dihydro-isoindole-1-one with five different dianhydrides namely, BPADA, 6-FDA, BTDA, ODPA and PMDA. All the PEI films exhibited significantly high permeability coefficients than those of common glassy polymers, e.g., cellulose acetate, polysulfone and polycarbonate as well as to other polymers based on cardo phenolphthalein or phthalimide or phthalimidine moiety. PEI-II and PEI-V showed exceptionally high permeability coefficient for all the gases ( P C O 2 = 53.85,39.57 Barrers, respectively) along with higher permselectivity towards CO 2 relative to CH 4 (53.32 and 50.09, repectively) in comparison to cardo phthalimidine based non-flourinated poly(arylene ether sulfones) reported previously. Moreover, high permeability coefficients for O 2 ( P O 2 = 10.23,7.62 Barrers, respectively) and comparable permselectivities towards O 2 relative to N 2 (4.4–6.35) made these series of PEI films highly interesting in comparison to the previously reported phthalimidine based poly(arylene ether sulfone)s or poly(arylene ether ketone)s. Temperature dependency of the permeation and diffusion processes enables to calculate the activation energies of the permeation and diffusion processes for these four different gases through these five PEI films. An attempt has been taken to draw a structure–property correlationship between the repeat unit structures or the functional groups present, and the gas transport properties of this series of PEI films.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
