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Dimethyl silane-modified silica in polydimethylsiloxane as gas permeation mixed matrix membrane

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Abstract

The gas transport behaviors of O2, N2, CO2 and CH4 were investigated in mixed matrix membranes (MMMs) prepared from polydimethylsiloxane (PDMS) filled with surface functionalized silica (SiO2) nanoparticles. SiO2 surface modification was performed through silanization using chlorodimethyl silane. FTIR confirmed the presence of dimethyl silane on SiO2 (Si-DMS) whereas elemental analysis showed 94.2% successful modification. Thermal gravimetric analysis revealed the improved thermal stabilities of PDMS MMMs. Field emission scanning electron microscopy revealed the uniform distribution of Si-DMS within the membrane. The effect of Si-DMS in gas permeabilities (P) was in contrast to the Maxwell model prediction. Enhanced P values of all gases in PDMS MMMs (as compared to pure PDMS) were associated to the improvement in diffusion coefficients (Dm) despite the reduction in gas solubility coefficients. The increase in Dm values was attributed to the higher free volumes in PDMS MMMs. However, slight declines (<8% of pure PDMS) in selectivities were observed. Overall, PDMS MMMs have improved performances due to enhanced gas permeabilities.

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Abbreviations

P:

Permeability

αA/B :

Ideal selectivity

J:

Gas flux

l:

Thickness

p1 :

Pressure at the feed stream

p2 :

Pressure at the permeate stream

PA :

Permeability of component A

PB :

Permeability of component B

Dm :

Diffusion coefficient

ts :

Steady-state saturation time

Hfumed silica :

H content of fumed SiO2

SA:

BET surface area

NA :

Avogadro constant

HDMS :

H removed in SiO2 due to silanization

mDMS :

Mole of DMS attached during silanization

MWC :

Molecular weight of carbon

D:

Diffusivity

S:

Solubility coefficient

PMMM :

Permeability of MMM

Ppure :

Permeability of pure polymeric membrane

∅ f :

Volume fraction of the filler

SMMM :

Solubility coefficient of MMM

Spure :

Solubility coefficient of pure polymeric membrane

Dmo :

Diffusion coefficient in pure PDMS

FFV:

Fractional free volume

ρMMM :

Measured density of MMM

mSi-DMS :

Weight fraction of Si-DMS in MMM

ρPDMS :

Measured density of PDMS

ρSi-DMS :

Measured density of Si-DMS

V0 :

Zero-point volume of PDMS

VPDMS :

Specific volume of PDMS

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Acknowledgements

This work was supported by Mid-Career Research Program (No. 2010–0027608) and by Priority Research Centers Program (No. 2010–0028300) through the National Research Foundation (NRF) of Korea funded by Ministry of Education Science and Technology (MEST).

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Authors and Affiliations

  1. Energy and Environment Fusion Technology Center, Department of Environmental Engineering and Biotechnology, Myongji University, Yongin City, Gyeonggi Province, 449-728, South Korea

    Grace M. Nisola, Arnel B. Beltran, Dong Min Sim, Dongjoo Lee & Wook-Jin Chung

  2. Laboratory of Environmental and Energy Materials, Department of Environmental Engineering and Biotechnology, Myongji University, Yongin City, Gyeonggi Province, 449-728, South Korea

    Bumsuk Jung

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  1. Grace M. Nisola
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Correspondence to Wook-Jin Chung.

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Nisola, G.M., Beltran, A.B., Sim, D.M. et al. Dimethyl silane-modified silica in polydimethylsiloxane as gas permeation mixed matrix membrane. J Polym Res 18, 2415–2424 (2011). https://doi.org/10.1007/s10965-011-9655-x

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