Gas permeation and sorption properties of non-ionic and cationic amino-hydroxy functionalized poly(dimethylsiloxane) membranes

Senthilkumar, U.; Rajini, R.; Reddy, B. S. R.

doi:10.1016/j.memsci.2004.12.045

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…In our previous work, we have studied the structure-gas transport properties of cationic and anionic membranes, their solubility and diffusivity with the cationic and anionic groups were discussed [30,31]. In this paper, we have reported the gas transport properties of PDMS-PU membranes containing various wt.% of hard segment content and with different hard segment structures.…”

Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane-urethane) membranes: Effect of hard segment in urethane on gas transport properties

Madhavan

Reddy

2006

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane-urethane) membranes: Effect of hard segment in urethane on gas transport properties

Madhavan

Reddy

2006

Journal of Membrane Science

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“…Polyethersulfone (PES) is a good choice for integrally‐skinned asymmetric membrane preparation with desirable characteristics such as wide operating temperatures, broad pH limits, suitable strength and flexibility, appropriate flux and cheapness . Gas permeation properties of PDMS membranes have been studied by many researchers …”

Section: Introductionmentioning

confidence: 99%

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

2014

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The present study is an attempt to investigate the effects of preparation and operation parameters on ideal and real selectivity of polydimethylsiloxane (PDMS) coated asymmetric polyethersulfone (PES) membranes for natural gas sweetening. Scanning electron microscopy (SEM) was used to study the effect of PES concentration and solvent type on membrane morphology. The effects of operating parameters on the performance of membranes were investigated by using binary CO 2 /CH 4 , H 2 S/CH 4 and ternary H 2 S/CO 2 /CH 4 gas mixtures. Higher concentrations of PES and a higher sequential coating number increase CO 2 /CH 4 selectivity and decrease CO 2 permeance. As a notable and interesting result, the membrane exhibits rubbery PDMS behaviour for H 2 S containing feeds and displays a glassy PES membrane for CO 2 /CH 4 mixed gas. An increase in the feed pressure decreases CO 2 and CH 4 permeance and increases CO 2 /CH 4 selectivity for CO 2 /CH 4 feed. For H 2 S/CH 4 and H 2 S/CO 2 /CH 4 mixed gas, enhancing the feed pressure results in higher CH 4 and lower CO 2 and H 2 S permeance and a declined CO 2 /CH 4 and H 2 S/CH 4 selectivity. Increasing temperature in binary CO 2 /CH 4 enhances CO 2 and CH 4 permeance and decreases CO 2 /CH 4 selectivity. Increasing the temperature increases CH 4 permeance and decreases H 2 S permeance for binary H 2 S/CH 4 mixture. For ternary mixture, increasing the temperature leads to a higher permeance for CO 2 and H 2 S and a lower CH 4 permeance. For binary CO 2 /CH 4 , a higher CO 2 concentration increases the membrane gas permeance and decreases CO 2 /CH 4 selectivity. Increasing the H 2 S concentration in the feed results in a reduction in gas pressure normalised flux of gases in ternary gas feed because of an increase in Flory-Huggins interaction parameter.

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“…Polysiloxanes have technological relevance in coatings,1–5 membranes,6–16 precursor for ceramics,17–23 among others 5, 23. The incorporation of siloxane units in polyamides,24 polyimides,25–28 epoxy resins,29–31 polyester resins,32 and polyurethanes33 often improves the mechanical properties,26, 28 resistance against corrosion,31, 32 thermal stability,29, 33 and membrane performance27 of these polymers.…”

Section: Introductionmentioning

confidence: 99%

Poly(n‐alkylsilsesquioxane)s: Synthesis, characterization, and modification with poly(dimethylsiloxane)

Prado

Torriani

Yoshida

2010

J. Polym. Sci. A Polym. Chem.

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Self-supported translucent films constituted of poly(n-octylsilsesquioxane) or poly(n-dodecylsilsesquioxane) were obtained from the hydrolysis and condensation of n-octyltriethoxysilane (OTES) or n-dodecyltriethoxysilane (DTES), respectively. Dense films were obtained in the absence of organic solvents, with dibutyltin diacetate as catalyst. These films exhibited good optical transparency and thermal stability. The incorporation of oligomeric dimethylsiloxane units (D Me,Me ) in these materials, derived from silanol-terminated poly(dimethylsiloxane) (PDMS) or 1,1,3,3-tetramethyl-1,3-diethoxydisiloxane (TMDES), was carried out during the hydrolysis and condensation of OTES and DTES and was confirmed by solid-state 29 Si NMR. Poly(n-octylsilsesquioxane) showed a glass-transition temperature at À65 C, due to the increase in the free volume, promoted by the bulky n-octyl groups. The differential scanning calorimetric (DSC) curves of the polymer derived from DTES were characterized by first-order transitions at temperatures ranging from À15.8 to À0.7 C. Further studies of these networks by low-temperature XRD evidenced narrowing of the diffraction halos suggesting a partial order-disorder transition for these materials at lower temperatures. Good thermal stability up to 350 C and the solvent-free production process make these polymers potential candidates for the development of self-supported hydrophobic protective coatings.

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Gas permeation and sorption properties of non-ionic and cationic amino-hydroxy functionalized poly(dimethylsiloxane) membranes

Cited by 12 publications

References 26 publications

Poly(dimethylsiloxane-urethane) membranes: Effect of hard segment in urethane on gas transport properties

Poly(dimethylsiloxane-urethane) membranes: Effect of hard segment in urethane on gas transport properties

PDMS coated asymmetric PES membrane for natural gas sweetening: Effect of preparation and operating parameters on performance

Poly(n‐alkylsilsesquioxane)s: Synthesis, characterization, and modification with poly(dimethylsiloxane)

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