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 ◽  
...  
2014 ◽  
Vol 912-914 ◽  
pp. 123-126
Author(s):  
Yu Hua Qiao ◽  
Huai Min Miao ◽  
Yong Biao Xu ◽  
Wei Jiang ◽  
Yan Hong Zheng ◽  
...  

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.


2017 ◽  
Vol 1 (1) ◽  
Author(s):  
A. Sannomiya ◽  
M. Iwase ◽  
S. Nagaoka ◽  
Y. Suzuki ◽  
M. Iwaki ◽  
...  

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.


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

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