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    Effect of molecular architectures in photoinduced birefringence in films of azo-modified diblock copolymers

    Year: 2014

    Journal: OPTICAL MATERIALS, Vol. 37, p 816-822, 20150722

    Authors: Saiz, Luciana M.; Zucchi, Ileana A.; Oyanguren, Patricia A.; Galante, Maria J.; Sanfelice, Rafaela C.; Balogh, Debora T.; Oliveira, Osvaldo N., Jr.

    Organizations: Univ Nacl Mar del Plata, Inst Invest Ciencia & Tecnol Mat INTEMA, Grp Polimeros Nanoestruct, CONICET, RA-7600 Mar Del Plata, Buenos Aires, Argentina; Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP, Brazil

    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 birefringente 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. (C) 2014 Published by Elsevier B.V.