Structure and gas permeation properties of asymmetric polyimide membranes made by dry-wet phase inversion: Influence of the polyimide molecular weight

2010 ◽  
Vol 118 (1) ◽  
pp. 105-112 ◽  
Author(s):  
Naoko Seki ◽  
Shoji Nagaoka ◽  
Hiroyoshi Kawakami
Keyword(s):  
Molecular Weight ◽  
Phase Inversion ◽  
Gas Permeation ◽  
Wet Phase Inversion ◽  
Permeation Properties ◽  
Polyimide Membranes

Gas Permeation Properties of Asymmetric Polyimide Membranes with Partially Carbonized Skin Layer

2004 ◽  
Vol 37 (18) ◽  
pp. 6892-6897 ◽  
Author(s):  
M. Iwase ◽  
A. Sannomiya ◽  
S. Nagaoka ◽  
Y. Suzuki ◽  
M. Iwaki ◽  
...  
Keyword(s):  
Skin Layer ◽  
Gas Permeation ◽  
Permeation Properties ◽  
Polyimide Membranes

Effects of 60Co-Irradiation on Gas Permeation Properties of Polyimide Membranes

2014 ◽  
Vol 912-914 ◽  
pp. 123-126
Author(s):  
Yu Hua Qiao ◽  
Huai Min Miao ◽  
Yong Biao Xu ◽  
Wei Jiang ◽  
Yan Hong Zheng ◽  
...  
Keyword(s):  
Gas Separation ◽  
Radiation Effects ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Ideal Selectivity ◽  
Tetracarboxylic Dianhydride ◽  
Permeation Properties ◽  
The Ideal ◽  
Polyimide Membranes

Radiation effects on polyimide (PI) membranes were studied with different irradiation doses by60Co. The PI membrane were synthesized from 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (Bis-AP-AF) with 3,3',4,4'-Benzophenone tetracarboxylic dianhydride (BTDA). The single gas permeability of He, H2, CO2, O2, N2and CH4were measured and compared in order to determine the effect of the the irradiation doses on the gas separation properties. The results showed that the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane can be significantly improved by irradiation of60Co source. The optimum irradiation doses were 50 kGy. The highest ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2is 3635.86, 2287.57, 282.00 and 205.29, respectively. In other word, the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane with 50 kGy irradiation doses is 2.27, 2.11, 1.89 and 1.08 times higher than that of the PI membranes without irradiation.

Synthesis of High Molecular Weight Poly[3-{tris(trimethylsiloxy)silyl}tricyclononenes-7] and Their Gas Permeation Properties

2011 ◽  
Vol 44 (17) ◽  
pp. 6637-6640 ◽  
Author(s):  
Maxim V. Bermeshev ◽  
Aleksander V. Syromolotov ◽  
Maria L. Gringolts ◽  
Ludmila E. Starannikova ◽  
Yurii P. Yampolskii ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Gas Permeation ◽  
Permeation Properties ◽  
High Molecular Weight Poly
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