Star polymer diffusion in concentrated solutions: Dependence on functionality via the coupling model
- 1 July 1990
- journal article
- research article
- Published by Wiley in Journal of Polymer Science Part B: Polymer Physics
- Vol. 28 (8) , 1367-1377
- https://doi.org/10.1002/polb.1990.090280811
Abstract
The coupling model is formulated in terms of the dynamic constraint entropy, Sc(t), and subsequently compared with measured tracer diffusion coefficients D for linear, 3‐arm star, and 12arm star polystyrenes in solutions of poly (vinyl methyl ether) (PVME) /o‐fluorotoluene. Inequalities between the dynamic constraint entropies, Scf and Scf′(t), respectively, for f‐arm and f′‐arm stars, enable us to explain the experimental observation that at constant arm molecular weight, the ratio Dstar/Dlinear decreases substantially with increasing concentration above the entanglement concentration for the PVME. This work indicates that not only the reptation model, but also the coupling model, can account for the experimental observation that in entangled solutions the mechanism for diffusion depends on diffusant architecture.Keywords
This publication has 17 references indexed in Scilit:
- Tracer diffusion of 3-arm and 12-arm star polystyrenes in dilute, semidilute, and concentrated poly(vinyl methyl ether) solutionsMacromolecules, 1989
- Tracer diffusion of linear polystyrenes in dilute, semidilute, and concentrated poly(vinyl methyl ether) solutionsMacromolecules, 1989
- Molecular weight and concentration dependences of the terminal relaxation time and viscosity of entangled polymer solutionsMacromolecules, 1987
- Translational diffusion of 12-arm star polystyrenes in dilute and concentrated poly(vinyl methyl ether) solutionsPolymer, 1987
- Translational diffusion of linear polystyrenes in dilute and semidilute solutions of poly(vinyl methyl ether)Macromolecules, 1987
- Physical origin of the anomalous temperature dependence of the steady-state compliance of low molecular weight polystyreneMacromolecules, 1987
- Translational diffusion of linear and 3-arm-star polystyrenes in semidilute solutions of linear poly(vinyl methyl ether)Macromolecules, 1986
- Differences in the molecular weight and the temperature dependences of self-diffusion and zero shear viscosity in linear polyethylene and hydrogenated polybutadienePolymer, 1985
- Relation of internal rotational isomerism barriers to the flow activation energy of entangled polymer melts in the high-temperature Arrhenius regionJournal of Polymer Science: Polymer Physics Edition, 1985
- Viscoelastic Theory of Branched and Cross-Linked PolymersThe Journal of Chemical Physics, 1957