ASPECTS ON POLYMER-SOLVENT EQUILIBRIUM AND DIFFUSION IN POLYMERIC MEMBRANES

2013 ◽  
Vol 12 (8) ◽  
pp. 1583-1591 ◽  
Author(s):  
Eugenia Teodora Iacob Tudose Ioan Mamaliga ◽  
Ciprian Constantin Negoescu ◽  
Nicoleta Bunduc
Keyword(s):  
Polymeric Membranes ◽  
And Diffusion ◽  
Polymer Solvent

Sorption and Diffusion of CO2/N2 in gas mixture in thermally-rearranged polymeric membranes: A molecular investigation

2017 ◽  
Vol 528 ◽  
pp. 135-146 ◽  
Author(s):  
Carmen Rizzuto ◽  
Alessio Caravella ◽  
Adele Brunetti ◽  
Chi Hoon Park ◽  
Young Moo Lee ◽  
...  
Keyword(s):  
Polymeric Membranes ◽  
Gas Mixture ◽  
Molecular Investigation ◽  
And Diffusion

Sorption equilibria and diffusion in polymeric membranes

1989 ◽  
Vol 51 ◽  
pp. 369-381 ◽  
Author(s):  
J. Hauser ◽  
A. Heintz ◽  
B. Schmittecker ◽  
R.N. Lichtenthaler
Keyword(s):  
Polymeric Membranes ◽  
Sorption Equilibria ◽  
And Diffusion

Modeling of CO2/CH4 gas mixture permeation and CO2 induced plasticization through an asymmetric cellulose acetate membrane

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16561-16567 ◽  
Author(s):  
M. Saberi ◽  
S. A. Hashemifard ◽  
Ali. A. Dadkhah
Keyword(s):  
Mathematical Model ◽  
Cellulose Acetate ◽  
Polymeric Membranes ◽  
Gas Mixture ◽  
Cellulose Acetate Membrane ◽  
Mixed Gases ◽  
And Diffusion

A mathematical model for permeation and diffusion of mixed gases in glassy polymeric membranes in the presence of plasticization was derived.

scholarly journals Comparative Atomic-Level Analysis of Sorption and Diffusion Properties of Membrane Materials on the Base of Polymer and Its Prepolymer: A Case Study of Polyheteroarylenes

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 925
Author(s):  
Andrey V. Petrov ◽  
Alexander M. Toikka
Keyword(s):  
Density Functional ◽  
Atomic Level ◽  
Polymeric Membranes ◽  
Material Structure ◽  
Functional Theory ◽  
The Density Functional Theory ◽  
Dynamics Simulations ◽  
And Diffusion ◽  
Level Analysis

The sorption properties of polymers and the mobility of penetrants are the main factors which determine the trans-membrane processes. Other factors concern the membrane material structure and chemical nature. In this paper, we consider the case of polymers with similar structure units, namely a polymer and its pre-polymer (polybenzoxazinoneimide and imide-containing polyamic acid). The available experimental data show a great difference in the pervaporation process using these two polymeric membranes. Some explanation of this difference can be found at the atomic-level study. A comparative analysis of the diffusion of water and isopropanol molecules was carried out using the density functional theory and molecular dynamics simulations

Fifth Canadian Geotechnical Colloquium: Control of contaminant migration by the use of liners

1982 ◽  
Vol 19 (3) ◽  
pp. 320-344 ◽  
Author(s):  
David J. Folkes
Keyword(s):  
Pollution Control ◽  
Hydraulic Properties ◽  
Diffusion Processes ◽  
Polymeric Membranes ◽  
Contaminant Migration ◽  
Seepage Rate ◽  
Migration Rates ◽  
Liner System ◽  
Compacted Clays ◽  
And Diffusion

Procedures satisfactory for the design of seepage control liners for hydraulic structures are not generally sufficient for the design of pollution control liners, where the primary intent is mitigation of contaminant migration effects on the environment. Contaminant migration rates and concentrations are controlled by seepage rate, dispersion and diffusion processes, and attenuation mechanisms such as filtration, precipitation, adsorption, and biodegradation. Both liner and subsoil (or bedrock) properties affect contaminant migration; thus, both should be considered as part of the overall liner system. Mechanisms for controlling migration are limited by the perceived extent of the liner system. Typical liner materials include compacted clays, admixes, polymeric membranes, spray-ons, and sealants. The field hydraulic properties, liner thickness, and liner–fluid compatibility should be considered in design

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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