Permeability and Diffusion through Mechanically Deformed Random Polymer Networks

2010 ◽  
Vol 43 (23) ◽  
pp. 10117-10122 ◽  
Author(s):  
Hassan Masoud ◽  
Alexander Alexeev
Keyword(s):  
Polymer Networks ◽  
Random Polymer ◽  
And Diffusion

Sorption and diffusion in polymer networks prepared from epoxide oligomers

1986 ◽  
Vol 28 (10) ◽  
pp. 2392-2397
Author(s):  
M.A. Markevich ◽  
L.S. Sakhonenko
Keyword(s):  
Polymer Networks ◽  
And Diffusion

scholarly journals Effect of sticker clustering on the dynamics of associative networks

Soft Matter ◽  
2021 ◽  
Author(s):  
Irina Mahmad Rasid ◽  
Changwoo Do ◽  
Niels Holten-Andersen ◽  
Bradley D. Olsen
Keyword(s):  
Polymer Networks ◽  
Associative Networks ◽  
Associative Polymer ◽  
And Diffusion

Exploration of effect of sticker clustering on dynamics of associative polymer networks showed trends in rheological relaxation and diffusion with clustering are different than for uniformly distributed stickers.

scholarly journals Kinetics of Polyelectrolyte Gels

2020 ◽  
Vol 87 (6) ◽  
Author(s):  
Haohui Zhang ◽  
Mohammad Dehghany ◽  
Yuhang Hu
Keyword(s):  
Chemical Potential ◽  
Polymer Networks ◽  
Potential Gradient ◽  
Stimuli Responsive ◽  
Cross Diffusion ◽  
Crosslinked Polymer ◽  
Polyelectrolyte Gels ◽  
Kinetics Of ◽  
Ionizable Groups ◽  
And Diffusion

Abstract Polyelectrolyte (PE) gels consist of crosslinked polymer networks that are grafted with ionizable groups and ionic solution. Many stimuli-responsive gels, including pH-responsive, electric-responsive, and light-responsive ones, are PE gels. Most soft biological components are also PE gels. Due to the increasing scientific interests and applications of PE gels, a comprehensive model is needed. In PE gels, not only solvent, but also ions and other small molecules all diffuse inside, and the flows of the different components are coupled. This phenomenon is called cross-diffusion, meaning the flow of one species is not only driven by its own chemical potential gradient, but also influenced by the flow of other species. In this work, we develop a rigorous nonequilibrium thermodynamics framework to study the coupled deformation and diffusion of the PE gels where cross-diffusion is emphasized and quantified. Specific forms of free energy and kinetic laws are proposed. A finite element method is developed and implemented into abaqus through a user element subroutine. The model is used to simulate the deformation of biological axon and PE gels.The numerical results are compared with experimental data. It is shown that cross-diffusion generates anomalous effects not only on the flux but also on the deformation of PE gels.

scholarly journals Shape analysis of random polymer networks

2020 ◽  
Vol 32 (33) ◽  
pp. 335102
Author(s):  
V Blavatska ◽  
K Haydukivska ◽  
Yu Holovatch
Keyword(s):  
Shape Analysis ◽  
Polymer Networks ◽  
Random Polymer

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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