Gas Transport Properties of Tetramethyl Polysulfones Containing Trimethylsilyl Group Side Substituents

Polymeric membranes comprised of poly(amidoamine) (PAMAM) dendrimer immobilized in a poly(ethylene glycol) (PEG) network exhibit an excellent CO 2 separation selectivity over H 2 . The CO 2 permeability increases with PAMAM dendrimer concentration in the polymeric membrane and becomes 500 times greater than H 2 permeability when the dendrimer content was 50 wt % at ambient conditions (5 kPa of CO 2 partial pressure). However, the detailed morphology of the membrane has not been discussed. The immiscibility of PAMAM dendrimer and PEG matrix results in phase separation, which takes place in a couple of microns scale. Especially, laser scanning confocal microscope captures a 3D morphology of the polymeric blend. The obtained 3D reconstructions dem-onstrate a bicontinuous structure of PAMAM dendrimer-rich and PEG-rich phases, which indicates the presence of PAMAM dendrimer channel penetrating the polymeric membrane, and CO 2 will preferentially pass through the dendrimer channel. In addition, Fourier transform of the 3D reconstructions indicates the presence of a periodic structure. An average size of the dendrimer domain calculated is 2-4 lm in proportion to PAMAM dendrimer concentration.

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Structural analysis of poly(amidoamine) dendrimer immobilized in crosslinked poly(ethylene glycol)

Taniguchi

Kazama

Jinnai

2012

J Polym Sci B Polym Phys

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Effect of Hexafluoro-2-propanol Substituents in Polymers on Gas Permeability and Fractional Free Volume

et al. 2005

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A series of polymers were synthesized containing hexafluoro-2-propanol (HFP) pendant groups by facile reaction of lithiated polymers with hexafluoroacetone (HFA). The purpose of the study was to evaluate the effect of the HFP group in potential membrane gas separation materials. Dibromobisphenol A polysulfone (PSf-Br2), tetramethylbisphenol A polysulfone (TMPSf), dibromohexafluorobisphenol A polysulfone (6FPSf-Br2), tetramethylhexafluorobisphenol A polysulfone (TM6FPSf), and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) were modified by using n-butyllithium to form lithiated intermediates and then treated with HFA to form the corresponding modified polymers PSf-HFP, TMPSf-HFP, 6FPSf-HFP, TM6FPSf-HFP, and PPO-HFP. Polymers with various degree of substitution per repeat unit of HFP were obtained, depending upon the extent of polymer lithiation and reactivity. PSf-HFP, TM6FPSf-HFP, and PPO-HFP were further derivatized at the hydroxyl group using iodomethane to obtain the respective methylated derivatives (HFM). The polymer structures were characterized by NMR spectroscopy, and thermal properties were investigated by differential scanning calorimetry and thermogravimetric analysis. The gas permeability coefficients of these polymers were measured for the gases He, O2, CO2, and N2. The gas transport properties of PSf-HFP, PSf-HFM, and TMPSf-HFP for He/N2, He/CO2, O2/N2, and CO2/N2 gas pairs were all improved in comparison with PSf and TMPSf. The permeabilities for all gases increased 2-3-fold, while the permselectivities of the four gas pairs increased as well. All the HFP derivatives showed improvements of this magnitude only for the He/CO2 gas pair. † NRCC No. 47860.

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Gas Transport Properties of Tetramethyl Polysulfones Containing Trimethylsilyl Group Side Substituents

Cited by 2 publications

References 12 publications

Structural analysis of poly(amidoamine) dendrimer immobilized in crosslinked poly(ethylene glycol)

Structural analysis of poly(amidoamine) dendrimer immobilized in crosslinked poly(ethylene glycol)

Effect of Hexafluoro-2-propanol Substituents in Polymers on Gas Permeability and Fractional Free Volume

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