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

L. SAIZ; ZUCCHI L.A.; OYANGUREN P. A.; GALANTE M.J; RAFAELA SANFELICE; BALOGH D. T.; OSVALDO OLIVEIRA

Chiang Mai

Congreso; IUPAC World Polymer Congress Macro 2014; 2014

IUPAC

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 storage ability 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.