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.

scholarly journals Gas Permeation Properties of Asymmetric Polyimide Membranes Made by Ion–beam Irradiation

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
A. Sannomiya ◽  
M. Iwase ◽  
S. Nagaoka ◽  
Y. Suzuki ◽  
M. Iwaki ◽  
...  
Keyword(s):  
Energy Loss ◽  
Gas Permeability ◽  
Ion Beam ◽  
High Vacuum ◽  
Pressure Gauge ◽  
Skin Layer ◽  
Gas Permeation ◽  
Absolute Pressure ◽  
Polyimide Membrane ◽  
Permeation Properties

In this study, the gas permeance and selectivity of the asymmetric polyimide membrane with skin layer carbonized by He ions irradiation were measured using a high vacuum apparatus with a Baratron absolute pressure gauge at 76 cmHg and 35°C. Particutarly, we focused on the effects of the depth profile of the energy loss for the irradiating He ions in the skin layer on the gas permeation properties of the asymmetric membranes. Irradiation depth is gauged through the energy loss profile of the irradiating ions. The nature of the carbonised layer was investigated using AFM and ATR–FTIR. We demonstrated that the PO2 of the He+–irradiated membranes increased with the skin layer thickness and that the depth of the irradiating ions in the skin layer had a significant influence on the gas permeability and selectivity of the asymmetric membrane.

Characterization and gas permeation properties of UV-cured fluorine-containing telechelic polyimide membranes with a crosslinker

2013 ◽  
Vol 54 (5) ◽  
pp. 1089-1099 ◽  
Author(s):  
Ryohei Shindo ◽  
Satoshi Amanuma ◽  
Kenta Kojima ◽  
Shuichi Sato ◽  
Shinji Kanehashi ◽  
...  
Keyword(s):  
Gas Permeation ◽  
Permeation Properties ◽  
Polyimide Membranes
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