Volume 61, Number 2, January 2003
|Page(s)||214 - 220|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 January 2003|
Anomalous scaling of the critical temperature of unmixing with chain length for two-dimensional polymer blends
Institut für Physik, WA331, Johannes Gutenberg-Universität D-55099 Mainz, Staudinger Weg 7, Germany
2 Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno Via S. Allende, I-84081 Baronissi (SA), Italy
Accepted: 28 October 2002
The thermodynamics, structure and the chain configurations of symmetrical polymer mixtures confined into ultrathin films are studied by Monte Carlo simulations of the bond fluctuation model. It is shown that the Flory-Huggins–type scaling of the critical temperature () with chain length N in the bulk is replaced by a weaker increase, , in an ultrathin film, and this is interpreted in terms of geometric arguments. The pair-correlation function of monomers from different chains exhibits a pronounced correlation hole, and the density of intermolecular contacts decreases with N as .
PACS: 61.41.+e – Polymers, elastomers, and plastics / 64.75.+g – Solubility, segregation, and mixing; phase separation / 68.60.-p – Physical properties of thin films, nonelectronic
© EDP Sciences, 2003
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