@article { ISI:000250356300015,
	title = {Gas permeation in amine functionalized silicon rubber membranes},
	journal = {Separation and Purification Technology},
	volume = {57},
	number = {2},
	year = {2007},
	month = {OCT},
	pages = {304-313},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Silicon rubber (SR) based thin film composite (TFC) membranes find increasing applicability in various industrial separations owing to its excellent thermal and chemical stability. The functionalization of SR would provide enhanced separation characteristics for certain separation applications. The present research focuses on gas permeation properties of dense and thin film composite membranes based on amine substituted silicon rubber (ASR) and unsubstituted silicon rubber (SR). The dense membrane sorption analysis indicated that presence of amine functionality in ASR increased pressure dependant CO2 sorption capacity. Owing to this, an elevation Of CO2 permeability by 15\% and CO2 based selectivities by 22-34\% in comparison to that of unsubstituted SR was observed. The TFC membranes with SR and ASR as the selective layer on the top of different ultrafiltration (UF) supports with varying properties based on polyacrylonitrile and polysulfone were prepared. The effects of crucial parameters that affected TFC membrane performance, viz., coating solution concentration, UF support membrane porosity and nature of materials were investigated. The preparation of ASR based TFC membranes was demonstrated with a simple crosslinking agent-glutaraldehyde while analyzing effects of crosslinking time on their permeation properties. Polyacrylonitrile (PAN) was found to be better support layer material for ASR based TFC formation than polysulfone (PSF). Thin defect free coating layer can be obtained by appropriate combination of coating solution concentration and support UF membrane porosity. The analysis of effective skin layer thickness of TFC membranes indicated that careful optimization of these parameters is necessary to achieve defect free TFC membranes possessing a good combination of permeance and selectivity. (C) 2007 Elsevier B.V. All rights reserved.</p>},
	keywords = {Carbon dioxide, Gas permeation, silicon rubber, thin film composite membrane},
	issn = {1383-5866},
	doi = {10.1016/j.seppur.2007.05.002},
	author = {Achalpurkar, Manoj P. and Kharul, Ulhas K. and Lohokare, Harshada R. and Karadkar, Prasad B.}
}
@article { ISI:000250122000026,
	title = {Gas sorption and transport in polyarylates: effect of substituent symmetry and polarity},
	journal = {Journal of Membrane Science},
	volume = {303},
	number = {1-2},
	year = {2007},
	month = {OCT},
	pages = {244-251},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>The gas sorption properties of polyarylates based on bisphenol-A possessing symmetric/asymmetric substitution by nonpolar -CH3 group and symmetrically linked terephthalic acid were examined. The effects of substitution of polar bromine on terephalic acid moiety of polyarylate based on asymmetrically substituted bisphenol were also studied for physical, sorption and transport properties. The estimation of dual mode sorption parameters, solubility and diffusion coefficient revealed that nature of the substituent and substitution type plays a crucial role in depicting permeation properties. An asymmetric substitution by -CH3 group increased solubility coefficient of pure gases (N-2, O-2, CH4 and CO2) up to 27\% and symmetric substitution increased the same up to 106\%. This was coupled with 7-35\% increase in solubility selectivity in both cases of substitution, which ascertained the usefulness of methyl group substitution in polyarylates based on terephalic acid. The pressure dependency of solubility coefficients and solubility selectivity was also investigated for these polyarylates. The sorption and transport properties of these polyarylates correlated well with physical properties of polyarylates and gases studied. The sorption/desorption kinetics of symmetrically substituted TMBisA-T was performed in order to deduce time dependent sorption behavior and to evaluate diffusivity coefficient. The apparent diffusion coefficients from sorption kinetics, desorption kinetics and from steady-states permeation-sorption were compared. The diffusion coefficients of CH4 and N-2 deduced by these methods correlated well with each other. (C) 2007 Elsevier B.V. All rights reserved.</p>},
	keywords = {Diffusion, kinetics, permeation, polyarylates, Sorption},
	issn = {0376-7388},
	doi = {10.1016/j.memsci.2007.07.018},
	author = {Karadkar, Prasad B. and Kharul, Ulhas K. and Bhole, Yogesh S. and Badhe, Yogesh P. and Tambe, Sanjeev S. and Kulkarni, Bhaskar D.}
}
