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

Sáiz, Luciana María; Zucchi, Ileana Alicia; Oyanguren, Patricia Angelica; Galante, Maria Jose; Sanfelice, Rafaela C.; Balogh, Débora Terezia; Oliveira, Osvaldo N.

doi:10.1016/j.optmat.2014.09.015

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…A few investigations based on similar supramolecular azopolymers were reported. [129][130][131][132] Besides hydrogen-bonded supramolecular multi-azopolymers, supramolecular multi-azopolymers based on other supramolecular interactions such as host-guest interactions 133 and ionic interactions 84 have also been investigated. These polymers formed supramolecular hydrogels with multi-stimuli responsive properties 133 and were used for photoinduced SRGs.…”

Section: Supramolecular Multi-azopolymersmentioning

confidence: 99%

Photoresponsive polymers with multi-azobenzene groups

Sun

Liang

et al. 2019

Polym. Chem.

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Section: Supramolecular Multi-azopolymersmentioning

confidence: 99%

Photoresponsive polymers with multi-azobenzene groups

Sun

Liang

et al. 2019

Polym. Chem.

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Supramolecular chirality and photochromism in Langmuir-Blodgett films of fabricated silver-induced phenylazoimidazole derivatives

Luo

et al. 2021

Dyes and Pigments

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Molecular ordering of PAH/MA-co-DR13 azopolymer layer-by-layer films probed by second-harmonic generation

Silva

Lopes

Miranda

2016

The Journal of Chemical Physics

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Molecular orientation within azopolymer thin films is important for their nonlinear optical properties and photonic applications. We have used optical second-harmonic generation (SHG) to study the molecular orientation of Layer-by-Layer (LbL) films of a cationic polyelectrolyte (poly(allylamine hydrochloride)) and an anionic polyelectrolyte containing azochromophore side groups (MA-co-DR13) on a glass substrate. The SHG measurements indicate that there is a preferential orientation of the azochromophores in the film, leading to a significant optical nonlinearity. However, both the signal strength and its anisotropy are not homogeneous throughout the sample, indicating the presence of large orientational domains. This is corroborated with Brewster angle microscopy. The average SHG signal does not increase with film thickness, in contrast to some reports in the literature, indicating an independent orientational order for successive bilayers. Analyzing the SHG signal as a function of the input and output polarizations, a few parameters of the azochromophore orientational distribution can be deduced. Fitting the SHG signal to a simple model distribution, we have concluded that the chromophores have an angular distribution with a slight in-plane anisotropy and a mean polar angle ranging from 45° to 80° with respect to substrate normal direction, with a relatively large width of about 25°. These results show that SHG is a powerful technique for a detailed investigation of the molecular orientation in azopolymer LbL films, allowing a deeper understanding of their self-assembling mechanism and nonlinear optical properties. The inhomogeneity and anisotropy of these films may have important consequences for their applications in nonlinear optical devices.

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

Cited by 3 publications

References 27 publications

Photoresponsive polymers with multi-azobenzene groups

Photoresponsive polymers with multi-azobenzene groups

Supramolecular chirality and photochromism in Langmuir-Blodgett films of fabricated silver-induced phenylazoimidazole derivatives

Molecular ordering of PAH/MA-co-DR13 azopolymer layer-by-layer films probed by second-harmonic generation

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