Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Ronald Koningsveld"'
Publikováno v:
The Journal of Physical Chemistry B. 108:16168-16173
Several years ago Utracki and Simha reported a remarkable independence of molar mass of the ratio of the thermodynamic critical (consolute) concentration and the concentration of incipient coil overlap, also known as "critical" concentration. They in
Publikováno v:
Macromolecules. 37:8082-8090
Addition of an ether-group-containing second solvent (tetrahydrofuran, THF) to the binary system water/linear poly(vinyl methyl ether) proved to have a profound influence on liquid/liquid phase relations and to cause a sharp decrease in solvent power
Publikováno v:
Polymer. 42:9163-9172
The effect of chain end groups on the thermodynamics of polymer blends is investigated by the collection of cloud point curves for low molecular weight blends of poly(isoprene) (PIP) with three different α,ω-functionally-terminated poly(dimethyl si
Publikováno v:
Macromolecules. 33:3924-3931
Calculations based on an extended Flory−Huggins−Staverman model demonstrate that miscibility gaps in virtually immiscible blends may encompass a complex pattern of metastable and unstable equilibria that differ little in Gibbs free energy. Exampl
Autor:
Frank Meeussen, Karel Dušek, Willy Mondelaers, Etienne Schacht, Karel Šolc, Ronald Koningsveld, H. Berghmans, R Moerkerke
Publikováno v:
Macromolecules. 31:2223-2229
It is demonstrated that the collapse of gels of radiation cross-linked poly(vinyl methyl ether) swollen in water is a truly discontinuous process obeying classic thermodynamic principles. The phenomenon can further be shown to be related to the relev
Publikováno v:
Polymer International. 44:356-364
It is demonstrated that estimation of the pair-interaction function from polymer-blend cloud points cannot yield meaningful values if data are restricted to a single blend. Additional information is required, such as cloud points in another blend mad
Publikováno v:
Macromolecules. 28:1103-1107
Equilibrium swelling of networks capable of separating into a highly swollen and a collapsed phase is discussed on the basis of a concentration-dependent pair interaction parameter. Classic rules, to be obeyed by the various binodals and their metast
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:1661-1688
Polymer solutions with a concentration-dependent interaction parameter g(ϕ) are known to have sometimes critical polymer concentrations ϕc converging to a non-zero value (a so-called "off-zero" limiting critical point (CP)), as the chain length, m,
Autor:
Karel Solc, Ronald Koningsveld
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:1689-1718
A method for computing phase diagrams of polydisperse A/B polymer blends is proposed, based on Flory-Huggins-Staverman thermodynamics, and employed to obtain cloud-point curves (CPCs), shadow curves, spinodals and coexistence curves for a series of s
Autor:
Ronald Koningsveld
Publikováno v:
Macromolecular Symposia. 78:1-13
The general principles of thermodynamic equilibrium in binary liquid systems are reviewed briefly, and extended to quasi-binary mixtures of polydisperse polymers. Molecular models allowing actual phase behaviour to be discussed in terms of molecular