Polyvinyl pyrrolidone (PVP) with high polarity was adopted to modify the surface of PDMS layer supported on polyacrylonitrile (PAN) hollow fiber, in order to improve the polarity and hydrophily of PDMS layer surface and ensure the minimum negative effect on gas permeability. The employment of PVP was to enhance the interfacial cohesion of polydimethylsiloxane (PDMS) gutter layer and polar selective layer in gas separation composite membrane. X-ray photoelectron spectroscopy (XPS) was utilized to prove that PVP could be grafted to PDMS layer and modify its surface by dip-coating, and the grafting quality and modification of PVP increased and enhanced respectively with the increase of coating time. Results showed that the crosslinker 1,3,5-Benzenetricarbonyl trichloride (TMC) could improve the function of PVP grafting modification, and the surfacewater contact angel decreased to 21.1°, which meant that the surface polarity and hydrophily of PDMS layer were obviously improved and the PDMS layer and polar selective layer were tightly combined. In addition, with the increase of molar ratio of TMC/PDMS, CO2/H2, CO2/CH4 and CO2/N2 selectivity decreased gradually by PVP modification, peaking at 3.9, 3.8 and 11.8, respectively.
Lei-qing HU,Jun CHENG,Ya-li WANG,Jian-zhong LIU,Jun-hu ZHOU,Ke-fa CEN. Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 228-233.
Fig.1Material chemical structures and SEM image of PAN hollow fiber
MT/P
PVP接枝改性
wB/%
Si
N
2∶3
改性前
24.12
2.28
改性后
22.59
3.04
10∶3
改性前
22.64
2.22
改性后
16.32
4.58
18∶3
改性前
21.66
2.03
改性后
14.82
7.70
Tab.1Variation of mass fraction of special elements on surface of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification
Fig.2XPS spectrum of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification
Fig.3Water contact angles of PDMS/PAN hollow fiber composite membranes before and after PVP grafting modification under different molar ratios of TMC/PDMS
Fig.4CO2 permeation rate of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification under different molar ratios of TMC/PDMS
Fig.5Selectivities of CO2 to other gases of PDMS/PAN hollow fiber composite membrane before and after PVP grafting modification under different molar ratios of TMC/PDMS
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