Effects of block copolymer self-assembly on optical anisotropy in azobenzene-containing PS-b-PMMA films
- Orofino, Antonela Beatriz
- Camezzana, Maria Florencia
- Galante, Maria Jose
- Oyanguren, Patricia Angelica
- Zucchi, Ileana Alicia
DOIAbstract
Polystyrene-b-polymethylmethacrylate (PS-b-PMMA) was selected as the host for 4-(4-nitrophenylazo)aniline (Disperse Orange 3, DO3) based on a previous study of DO3/PMMA and DO3/PS binary blends. Selective location of DO3 into the PMMA block of the copolymer was expected during self-assembly of the block copolymer since a preferential interaction of DO3 with PMMA has been demonstrated. However, surface segregation of DO3 was found during the thermal annealing used to nanostructure the copolymer. To avoid this, a thermoplastic polymer (Azo-TP) was synthesized from the bulk reaction of DO3 and diglycidyl ether of bisphenol A (DGEBA). The choice of DGEBA as a co-reactant was an attempt to encourage the selective location of azo groups in the PM...
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