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Titolo:
Symmetric binary polymer blends confined in thin films between competing walls: Interplay between finite size and wetting behavior
Autore:
Binder, K; Muller, M; Albano, EV;
Indirizzi:
Univ Mainz, Inst Phys, D-55099 Mainz, Germany Univ Mainz Mainz Germany D-55099 ainz, Inst Phys, D-55099 Mainz, Germany Univ Nacl La Plata, INIFTA, RA-1900 La Plata, Argentina Univ Nacl La Plata La Plata Argentina RA-1900 A-1900 La Plata, Argentina
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 7, volume: 3, anno: 2001,
pagine: 1160 - 1168
SICI:
1463-9076(2001)3:7<1160:SBPBCI>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONTE-CARLO SIMULATIONS; INTERFACE LOCALIZATION TRANSITION; CONSISTENT-FIELD CALCULATIONS; BLOCK-COPOLYMER MELTS; PHASE-TRANSITIONS; ISING FILMS; GINZBURG CRITERION; COEXISTING PHASES; POTTS-MODEL; MIXTURES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Binder, K Univ Mainz, Inst Phys, D-55099 Mainz, Germany Univ Mainz MainzGermany D-55099 Phys, D-55099 Mainz, Germany
Citazione:
K. Binder et al., "Symmetric binary polymer blends confined in thin films between competing walls: Interplay between finite size and wetting behavior", PHYS CHEM P, 3(7), 2001, pp. 1160-1168

Abstract

The phase behavior and structure of a symmetric binary polymer blend confined between two hard impenetrable walls is studied, assuming also short range forces between the monomers and the walls. Phenomenological considerations are elaborated with the self-consistent field theory of Gaussian chains,and also some Monte Carlo simulations of the bond-fluctuation model. In the case of "antisymmetric" walls (right wall attracts component A with the same strength as does left wall component B) the phase diagram is symmetric around volume fraction phi =1/2. For very thin films (or very weak surface fields) one finds a single critical point at phi (c)=1/2, as in the bulk. For thicker films, or stronger surface fields, the phase diagram exhibits two critical points and two concomitant coexistence regions, down to a triplepoint T-t, while below the triple point there is a single coexistence region. When the film thickness D --> infinity, the two coexistence regions forT >T-t shrink into the prewetting lines, while T-t approaches the wetting transition temperature. Asymmetric surface forces are also considered, studying the smooth crossover from "antisymmetric walls'' to "symmetric walls''(that both attract the A component with the same strength). The resulting crossover between capillary-type behavior (i.e., a single critical point ofthe thin film) and the above behavior with two critical points is analyzed. Particular attention is paid to the behavior of interfaces between coexisting phases.

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Documento generato il 05/04/20 alle ore 23:53:07