TY - JOUR
T1 - Physical modification of poly [1(trimethylsilyl)-1-propyne] membranes for gas separation
AU - Nakagawa, Tsutomu
AU - Fujisaki, Shinji
AU - Nakano, Hiroyuki
AU - Higuchi, Akon
PY - 1994/9/19
Y1 - 1994/9/19
N2 - Poly[1-(trimethylsilyl)-1-propyne], PMSP, has the highest gas permeability of any synthetic polymer but exhibits a deterioration of these gas permeability properties with time. A technique of blending PMSP with liquid poly (dimethylsiloxanes), PDMS, of different molecular weights was used to alter the decay in gas permeability properties of PMSP. Sorption isotherms and permeability coefficient of CO2 were measured. The Langmuir capacity constant, C′H, decreased with increasing content of PDMS in the membrane. Both soprtion and the permeability behavior showed that modified membranes changed from a glassy state to a rubbery state where the PDMS content of the lower viscosity liquids was larger than 40 wt%. PDMS of higher viscosity was more effective for decreasing of C′H. These results suggest that the filling of larger PDMS molecules occurred selectively in the larger microvoids rather than the smaller ones and the filling of smaller PDMS molecules occured in both the small and large microvoids in the PMSP membrane.
AB - Poly[1-(trimethylsilyl)-1-propyne], PMSP, has the highest gas permeability of any synthetic polymer but exhibits a deterioration of these gas permeability properties with time. A technique of blending PMSP with liquid poly (dimethylsiloxanes), PDMS, of different molecular weights was used to alter the decay in gas permeability properties of PMSP. Sorption isotherms and permeability coefficient of CO2 were measured. The Langmuir capacity constant, C′H, decreased with increasing content of PDMS in the membrane. Both soprtion and the permeability behavior showed that modified membranes changed from a glassy state to a rubbery state where the PDMS content of the lower viscosity liquids was larger than 40 wt%. PDMS of higher viscosity was more effective for decreasing of C′H. These results suggest that the filling of larger PDMS molecules occurred selectively in the larger microvoids rather than the smaller ones and the filling of smaller PDMS molecules occured in both the small and large microvoids in the PMSP membrane.
UR - http://www.scopus.com/inward/record.url?scp=0028501786&partnerID=8YFLogxK
U2 - 10.1016/0376-7388(93)E0169-K
DO - 10.1016/0376-7388(93)E0169-K
M3 - 期刊論文
AN - SCOPUS:0028501786
SN - 0376-7388
VL - 94
SP - 183
EP - 193
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1
ER -