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Acta Phys. -Chim. Sin.  2017, Vol. 33 Issue (10): 2058-2063    DOI: 10.3866/PKU.WHXB201705101
ARTICLE     
Preparation and Gas Separation Properties of Melamine-Phthalaldehyde Porous Polymer/Polydimethylsiloxane Mixed Matrix Membrane
Ya-Dan WANG,Qiang XIAO*(),Yi-Jun ZHONG,Wei-Dong ZHU
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Abstract  

Melamine phthalaldehyde porous polymer (MA)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) were prepared using the solution casting method. The morphology of the membranes was examined using a scanning electron microscope (SEM). The gas separation performance of the prepared MA/PDMS MMMs with different MA contents was investigated. The results indicate that the incorporation of MA could improve the permeability/selectivity combinations of the PDMS membrane. On increasing the MA content, the permeability of the membranes increased, whereas, the separation selectivity increased at first and then decreased. The binary gas permeation test results showed that separation selectivities of 19.2 and 6.0 for CO2/N2 and CO2/CH4, respectively, were achieved on the MA/PDMS (1.2% (w, mass fraction)) membrane. Additionally, the CO2 permeability reached up to 8100 Barrer, much higher than that of the pure PDMS membrane. The MA/PDMS (1.2% (w)) MMM surpasses the Roberson upper bound for CO2/N2 separation.



Key wordsPorous polymer      PDMS      Mixed matrix membrane      Gas separation     
Received: 05 April 2017      Published: 10 May 2017
MSC2000:  O643  
Fund:  the National Natural Science Foundation of China(21471131);the National Natural Science Foundation of China(21303166)
Corresponding Authors: Qiang XIAO     E-mail: xiaoq@zjnu.cn
Cite this article:

Ya-Dan WANG,Qiang XIAO,Yi-Jun ZHONG,Wei-Dong ZHU. Preparation and Gas Separation Properties of Melamine-Phthalaldehyde Porous Polymer/Polydimethylsiloxane Mixed Matrix Membrane. Acta Phys. -Chim. Sin., 2017, 33(10): 2058-2063.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201705101     OR     http://www.whxb.pku.edu.cn/Y2017/V33/I10/2058

Fig 1 Structural formula of MA.
Fig 2 77 K, N2 adsorption-desorption isotherm and DFT pore size distribution of MA.
Fig 3 SEM (a) and TEM (b) images of MA and photograph of MA in n-heptane solution (c).
Fig 4 Surface SEM images and corresponding photographs(inset) of MA/PDMS MMMs. (a) pure PDMS; (b) 0.4% MA/PDMS; (c) 1.2% MA/PDMS; (d) 2.0% MA/PDMS.
Fig 5 Cross-sectional SEM images of MA/PDMS MMMs. (a) pure PDMS; (b) 0.4% MA/PDMS; (c) 1.2% MA/PDMS; (d) 2.0% MA/PDMS.
Membrane PCO2/Barrer PN2/Barrer αCO2/N2 PCH4/Barrer αCO2/CH4
Pure PDMS 3496 ± 160 321 ± 13 10.9 ± 0.6 1030 ± 45 3.4 ± 0.3
0.4% MA/PDMS 4458 ± 204 340 ± 16 13.1 ± 0.6 1110 ± 50 4.0 ± 0.3
1.2% MA/PDMS 5512 ± 235 343 ± 22 16.1 ± 0.7 1251 ± 60 4.4 ± 0.3
2.0% MA/PDMS 5909 ± 270 592 ± 35 10.0 ± 0.5 2180 ± 115 2.7 ± 0.2
Table 1 Pure gas permeability and ideal selectivity at 293 K on the MA/PDMS MMMs.
Fig 6 Binary gas separation performances of MA/PDMS MMMs with different MA contents at 293 K and differential pressure (△p) of 3 × 105 Pa. (a) nCO2 : nN2 = 1 : 1; (b) nCO2 : nCH4 = 1 : 1.
Fig 7 Evaluation of the CO2/N2 (a)and CO2/CH4 (b) separation performance of MA/PDMS MMMs relative to the Robeson upper bounds. The filled square symbols represent the data for the MMMs with different MA loadings.
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