Role of Aromatic Polyimide Membrane in CO2 Separations

2019 ◽  
pp. 150-181
Author(s):  
Peng Chee Tan ◽  
Pei Ching Oh ◽  
Siew Chun Low
Keyword(s):  
Aromatic Polyimide ◽  
Polyimide Membrane

Study on molecular weight cut-off performance of asymmetric aromatic polyimide membrane

1997 ◽  
Vol 123 (1) ◽  
pp. 143-147 ◽  
Author(s):  
H. Ohya ◽  
I. Okazaki ◽  
M. Aihara ◽  
S. Tanisho ◽  
Y. Negishi
Keyword(s):  
Molecular Weight ◽  
Aromatic Polyimide ◽  
Polyimide Membrane

scholarly journals Molecular Weight and Gas Separation Performance of Polyimide Membrane: Insight into Role of Imidization Route

2020 ◽  
Vol 24 (3) ◽  
Author(s):  
P. C. Tan ◽  
D. Y. Yiauw ◽  
G. H. Teoh ◽  
S. C. Low ◽  
Z. A. Jawad
Keyword(s):  
Molecular Weight ◽  
Gas Separation ◽  
Separation Performance ◽  
Synthesis Conditions ◽  
Polyimide Membrane ◽  
Gas Transport Properties ◽  
Thermal Imidization ◽  
Insight Into ◽  
Gas Separation Performance

Various methods have been explored to improve the gas separation performance of polyimide membrane for more viable industrial commercialization. Generally, polyimide membrane can be synthesized via two different methods: chemical imidization and thermal imidization routes. Due to the markedly different membrane synthesis conditions, the influence of imidization methods on the gas transport properties of resulting membrane is worthy of investigation. The polyimide produced from two imidization methods was characterized for its molecular weight. In overall, the molecular weight of thermally imidized polyimide was higher than that of chemically imidized one except ODPA-6FpDA:DABA as it was prone to depropagation at high temperature. It was observed that the chemically imidized ODPA-6FpDA:DABA membrane possessed better gas separation performance than the thermally imidized counterpart. In particular, it showed 12 times higher CO2 permeability (19.21 Barrer) with CO2/N2 selectivity of 5. After crosslinking, the CO2/N2 selectivity of the polyimide membrane was further improved to 11.8 at 6 bar of permeation pressure.

scholarly journals The aromatic polyimide membrane for gas separation and its applications.

1988 ◽  
Vol 67 (12) ◽  
pp. 1038-1051 ◽  
Author(s):  
Asumaru NAKAMURA ◽  
Minoru HOTTA ◽  
Kohei NINOMIYA
Keyword(s):  
Gas Separation ◽  
Aromatic Polyimide ◽  
Polyimide Membrane

Separation of alcohol aqueous solution by pervaporation using asymmetric polyimide membrane

1995 ◽  
Vol 7 (3) ◽  
pp. 275-281 ◽  
Author(s):  
H Yanagishita ◽  
D Kitamoto ◽  
T Nakane
Keyword(s):  
Aqueous Solution ◽  
Phase Inversion ◽  
Dimethyl Formamide ◽  
Inversion Process ◽  
Vacuum Oven ◽  
Aromatic Polyimide ◽  
Membrane Performance ◽  
Polyimide Membrane ◽  
Separation Factors ◽  
Phase Inversion Process

Asymmetric polyimide membranes were prepared by the phase inversion process by casting solutions composed of 25 wt% aromatic polyimide (PI-2080), 35 wt% N,N'-dimethyl formamide (DMF) and 40wt% dioxane. The membranes were annealed at 300C for 3 h in a vacuum oven and were measured for various alcohol aqueous solutions in pervaporation. The membrane exhibited separation factors of a(H20/EtOH) = 900 and a(H,0/2-PrOH)= I I000 with a flux of 0.45 kgm 2 h t for a 95 vol.% alcohol aqueous solution at 60C. The membrane showed stable membrane performance for 3 months for a 95 vol.% ethanol aqueous solution at 60"C.

scholarly journals Copolyamide-Imide Membrane with Low CTE and CME for Potential Space Optical Applications

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1001
Author(s):  
Jiajia Yin ◽  
Danbo Mao ◽  
Bin Fan
Keyword(s):  
Imaging System ◽  
Coefficient Of Thermal Expansion ◽  
Structure Design ◽  
Optical Telescope ◽  
Aromatic Polyimide ◽  
System Architectures ◽  
Moisture Expansion ◽  
Polyimide Membrane ◽  
Optical Applications ◽  
Coefficient Of Moisture Expansion

Polyimide diffractive membrane lens can be used in space optical telescope to reduce the size and mass of an imaging system. However, traditional commercial aromatic polyimide membrane is hard to meet the challenging requirements of dimensional stability and optical homogeneity for optical use. Based on molecular structure design and the optimization of fabrication process, the prepared copolyamide-imide membrane achieved the desired performance of membrane as an optical material. It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of −150–100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH). For the optical use, the prepared copolyamide-imide membrane (φ200 mm) achieved good thickness uniformity with wave-front error smaller than λ/30 (λ = 632 nm) in RMS (root mean square). Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. Copolyamide-imide membranes in this research with good comprehensive performance can be used as large aperture membrane optical system architectures.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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