Physical aging of thin 6FDA-based polyimide membranes containing carboxyl acid groups. Part I. Transport properties

Polymer ◽  
2006 ◽  
Vol 47 (9) ◽  
pp. 3094-3103 ◽  
Author(s):  
J.H. Kim ◽  
W.J. Koros ◽  
D.R. Paul
Keyword(s):  
Transport Properties ◽  
Physical Aging ◽  
Polyimide Membranes

Relationship between the gas transport properties and the refractive index in high-free-volume fluorine-containing polyimide membranes

2011 ◽  
Vol 121 (5) ◽  
pp. 2794-2803 ◽  
Author(s):  
Shuichi Sato ◽  
Takamasa Ose ◽  
Sou Miyata ◽  
Shinji Kanehashi ◽  
Hiroto Ito ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transport Properties ◽  
Free Volume ◽  
Gas Transport ◽  
Gas Transport Properties ◽  
Polyimide Membranes

Modeling of the sorption and transport properties of water vapor in polyimide membranes

2012 ◽  
Vol 409-410 ◽  
pp. 96-104 ◽  
Author(s):  
George Q. Chen ◽  
Colin A. Scholes ◽  
Cara M. Doherty ◽  
Anita J. Hill ◽  
Greg G. Qiao ◽  
...  
Keyword(s):  
Water Vapor ◽  
Transport Properties ◽  
Polyimide Membranes

Effect of physical aging on the gas transport properties of PVC and PVC modified with pyridine groups

Polymer ◽  
2001 ◽  
Vol 42 (11) ◽  
pp. 4817-4823 ◽  
Author(s):  
P. Tiemblo ◽  
J. Guzmán ◽  
E. Riande ◽  
C. Mijangos ◽  
H. Reinecke
Keyword(s):  
Transport Properties ◽  
Physical Aging ◽  
Gas Transport ◽  
Gas Transport Properties

Effects of carbon dioxide-induced plasticization on the gas transport properties of glassy polyimide membranes

2007 ◽  
Vol 298 (1-2) ◽  
pp. 147-155 ◽  
Author(s):  
Shinji Kanehashi ◽  
Tsutomu Nakagawa ◽  
Kazukiyo Nagai ◽  
Xavier Duthie ◽  
Sandra Kentish ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Transport Properties ◽  
Gas Transport ◽  
Gas Transport Properties ◽  
Polyimide Membranes

scholarly journals A Coupled Thermodynamic Model for Transport Properties of Thin Films during Physical Aging

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 387 ◽  
Author(s):  
Hongjiu Hu ◽  
Xiaoming Fan ◽  
Yaolong He
Keyword(s):  
Thin Films ◽  
Transport Properties ◽  
Free Volume ◽  
Physical Aging ◽  
Field Equations ◽  
Lattice Contraction ◽  
Strongly Coupled ◽  
Coupled Diffusion ◽  
Coupled Field Equations ◽  
Short Time

A coupled diffusion model based on continuum thermodynamics is developed to quantitatively describe the transport properties of glassy thin films during physical aging. The coupled field equations are then embodied and applied to simulate the transport behaviors of O2 and CO2 within aging polymeric membranes to validate the model and demonstrate the coupling phenomenon, respectively. It is found that due to the introduction of the concentration gradient, the proposed direct calculating method on permeability can produce relatively better consistency with the experimental results for various film thicknesses. In addition, by assuming that the free volume induced by lattice contraction is renewed upon CO2 exposure, the experimental permeability of O2 within Matrimid® thin film after short-time exposure to CO2 is well reproduced in this work. Remarkably, with the help of the validated straightforward permeability calculation method and free volume recovery mechanism, the permeability behavior of CO2 is also well elucidated, with the results implying that the transport process of CO2 and the variation of free volume are strongly coupled.

Effect of physical aging on the gas transport properties of poly(methyl methacrylate) membranes

2007 ◽  
Vol 303 (1-2) ◽  
pp. 29-36 ◽  
Author(s):  
Chien-Chieh Hu ◽  
Ywu-Jang Fu ◽  
Sheng-Wen Hsiao ◽  
Kueir-Rarn Lee ◽  
Juin-Yih Lai
Keyword(s):  
Methyl Methacrylate ◽  
Transport Properties ◽  
Physical Aging ◽  
Gas Transport ◽  
Poly Methyl Methacrylate ◽  
Gas Transport Properties
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