Artículos de revistas
Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers
Fecha
2014-11Registro en:
Optical Materials, Amsterdam : Elsevier BV, v. 37, p. 816-822, Nov. 2014
0925-3467
10.1016/j.optmat.2014.09.015
Autor
Sáiz, Luciana M.
Zucchi, Ileana A.
Oyanguren, Patricia A.
Galante, María J.
Sanfelice, Rafaela C.
Balogh, Débora Terezia
Oliveira Junior, Osvaldo Novais de
Institución
Resumen
Langmuir films of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) with an azo dye, 4-[4-(phenylazo)-1-naphthylazo]phenol (Disperse Orange 13, DO13), hydrogen-bonded to the pyridine group of P4VP blocks were investigated. The surface pressure isotherms were considerably different for the copolymer dissolved in a nonselective (chloroform) and selective (toluene) solvents. The Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) films produced with PS-b-P4VP(DO13) copolymers displayed higher optically induced birefringence than the cast films owing to their nanostructured nature. The photoinduced birefringence properties were particularly enhanced when toluene was used owing to the confinement of azo chromophores in micelles consisting of a P4VP core and a PS corona.