Synthesis and Gas Permeability of Hyperbranched and Cross-Linked Polyimide Membranes

AbstractPolyimide membranes and network hybrid membranes exhibit high permeability despite good thermal and chemical stability, and high selectivity in gas mixture separation. In this study, the effect of nanoparticle distribution on the network polymer network, and changes in permeability, selectivity, and structure of the composite lattice membrane are investigated. According to the obtained permeability results, this increase in permeability was due to the increase of polymer network free volume and the formation of cavities in the nanoparticle-polymer interface. The significant results were that the permeability growth of gases with larger molecular size such as methane and nitrogen was higher than other gases. A comparison of the permeability growth of gases with the increasing volume fraction of nanoparticles confirms the dominance of the molecular sieve mechanism and the type of membrane transport mechanism change over polyimide and network Hybrid.

Download Full-text

Microstructural parameters controlling gas permeability and permselectivity in polyimide membranes

Journal of Membrane Science ◽

10.1016/j.memsci.2009.11.016 ◽

2010 ◽

Vol 349 (1-2) ◽

pp. 25-34 ◽

Cited By ~ 16

Author(s):

Corine Bas ◽

Régis Mercier ◽

Charles Dauwe ◽

N. Dominique Albérola

Keyword(s):

Gas Permeability ◽

Microstructural Parameters ◽

Polyimide Membranes

Download Full-text

Physical aging of 6FDA-based polyimide membranes monitored by gas permeability

Polymer ◽

10.1016/j.polymer.2011.05.052 ◽

2011 ◽

Vol 52 (15) ◽

pp. 3374-3380 ◽

Cited By ~ 61

Author(s):

Lili Cui ◽

Wulin Qiu ◽

D.R. Paul ◽

W.J. Koros

Keyword(s):

Physical Aging ◽

Gas Permeability ◽

Polyimide Membranes

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.123 ◽

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.

Download Full-text