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Journal of Polymer Research

, Volume 18, Issue 6, pp 2415–2424 | Cite as

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

  • Grace M. Nisola
  • Arnel B. Beltran
  • Dong Min Sim
  • Dongjoo Lee
  • Bumsuk Jung
  • Wook-Jin ChungEmail author
Original Paper

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.

Keywords

Dimethyl silane Gas permeation Membrane Nanocomposite Polydimethylsiloxane Silica 

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

Notes

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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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Grace M. Nisola
    • 1
  • Arnel B. Beltran
    • 1
  • Dong Min Sim
    • 1
  • Dongjoo Lee
    • 1
  • Bumsuk Jung
    • 2
  • Wook-Jin Chung
    • 1
    Email author
  1. 1.Energy and Environment Fusion Technology Center, Department of Environmental Engineering and BiotechnologyMyongji UniversityYongin CitySouth Korea
  2. 2.Laboratory of Environmental and Energy Materials, Department of Environmental Engineering and BiotechnologyMyongji UniversityYongin CitySouth Korea

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