Synthesis of azopolymers with controlled structure and photoinduced birefringence in their LB films

Pavinatto, Felippe J.; Barletta, Juliana Yamashita; Sanfelice, Rafaela C.; Cardoso, Maria Aparecida Alves; Balogh, Débora Terezia; Mendonça, Cleber Renato; Oliveira, Osvaldo N.

doi:10.1016/j.polymer.2008.11.043

Cited by 19 publications

(14 citation statements)

References 39 publications

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“…HPDR1-MA was synthesized via atom transfer radical polymerization (ATRP) using the 4-(N-ethyl-N-(2-methacryloxyethyl)-4 0 -nitroazobenzene (DR1-MA) monomer [21] which was obtained by esterification reaction of methacrylic acid and the commercial dye DR1. This polymerization was performed using purified DR1-MA (2.4 Â 10 À4 mol), ethyl-2-bromobutyrate (EBB) (Aldrich) (6.15 Â 10 À5 mol) as an initiator, and the catalytic system CuCl/ 1,1,4,7,10,10 hexamethyltriethylenetetramine (HMTETA) (J.T.…”

Section: Materials and Characterizationmentioning

confidence: 99%

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Ceridório¹,

Balogh²,

Caseli

et al. 2010

Journal of Colloid and Interface Science

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a b s t r a c tThe applicability of azopolymers in optical storage can be extended through the use of nanostructured films produced with the Langmuir-Blodgett (LB) technique, but the film properties need to be optimized since these polymers generally do not form stable Langmuir films to be transferred onto solid substrates. Here, photoinduced birefringence was investigated for mixed Langmuir-Blodgett films from the homo-0 -nitroazobenzene (HPDR1-MA) and poly(dodecylmethacrylate) (HPDod-MA). The interactions between these polymers were studied in Langmuir and LB films. Surface pressure-area isotherms pointed to molecular-level interactions for proportions of 51 mf%, 41 mf% and 31 mf% of HPDR1-MA. Phase segregation was not apparent in the BAM images, in which the morphology of the blend film was clearly different from that of the Langmuir films of neat homopolymers. Through PM-IRRAS, we noted that the interaction between the azopolymer and HPDod-MA affected the orientation of carbonyl groups. Strong interactions for the mixture with 41 mf% of poly(dodecylmethacrylate) led to stable Langmuir films that were transferred onto solid supports as LB films. The photoinduced birefringence of 101-layer mixed LB films show features that make these films useful for optical storage, with the advantage of short writing times in comparison to other azopolymer films.

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Section: Materials and Characterizationmentioning

confidence: 99%

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Ceridório¹,

Balogh²,

Caseli

et al. 2010

Journal of Colloid and Interface Science

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“…Our results open very attractive perspectives for the architecture control of azobenzene-containing LDBCs Langmuir films, with different hydrophilic/hydrophobic ratio, and for the preparation of thin films of these materials using the Langmuir-Blodgett technique [11,16,65]. In this sense, we have planned the transference of these compounds onto solid substrates, to study their photoresponsiveness and also to check their ability to act as command surfaces [66].…”

Section: Discussionmentioning

confidence: 97%

“…More recently, azobenzene-containing block copolymers (BCs) have been employed in the formation of LB films with a photoresponsive 2D-nanostructure. The photoinduction of optical anisotropy in this type of films has also been investigated [15,16].…”

Section: Introductionmentioning

confidence: 99%

Air–water interfacial behavior of linear-dendritic block copolymers containing PEG and azobenzene chromophores

Giner

Haro

Gascón

et al. 2011

Journal of Colloid and Interface Science

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“…[8][9][10] Making use of these unique properties, the applications of amphiphilic block copolymers as nanoreactors, drug delivery systems, biodiagnostics, nanolithography, ultrahigh-density storage media, and nanoporous membranes have been actively explored. [11][12][13][14] The synthesis of well-defined amphiphilic block copolymers was achieved by the development of living/controlled polymerization techniques, especially by atom transfer radical polymerization (ATRP), [15][16][17] ring-opening metathesis polymerization (ROMP), 18 and reversible addition-fragmentation chain transfer polymerization (RAFT). 19 However, in these typical polymerization techniques, macroinitiators and/or macromolecular chain transfer agents are needed to fabricate the final block copolymers, and in some particular cases, the reactivity of the macroinitiators and/or the second monomer is not high enough to form the required block copolymers completely.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and photo‐responsive properties of Y‐shaped amphiphilic azo triblock copolymer

Wei

Zhang

et al. 2016

J of Applied Polymer Sci

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In this study, we report the synthesis, characterization, and photo-responsive properties of a new Y-shaped amphiphilic azo triblock copolymer composed of two isotropic polyethylene glycol (PEG) blocks and an azobenzene liquid crystalline block. The azo block, with two ending groups suitable for the azo coupling reaction, is polymerized by atom transfer radical polymerization with a synthesized initiator containing two functional terminal groups. The macromolecular diazonium salts are prepared by the diazotization of PEG terminated with an amino group. The triblock copolymer is obtained by the azo coupling reaction between the azo block and macromolecular diazonium salts in DMF under mild condition. The intermediates and the obtained triblock copolymer are characterized by 1 H NMR, FT-IR, GPC, POM, DSC, TEM, and UV-vis. The photoinduced isomerization behavior of the azo copolymer is investigated by UV-vis. With the addition of water into the solution of the triblock copolymer, spherical aggregates with an average diameter of about 400 nm can be easily obtained. The aggregates are elongated when irradiated with polarized 365 nm UV light.

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Synthesis of azopolymers with controlled structure and photoinduced birefringence in their LB films

Cited by 19 publications

References 39 publications

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Molecular-level interactions of an azopolymer and poly(dodecylmethacrylate) in mixed Langmuir and Langmuir–Blodgett films for optical storage

Air–water interfacial behavior of linear-dendritic block copolymers containing PEG and azobenzene chromophores

Synthesis, characterization, and photo‐responsive properties of Y‐shaped amphiphilic azo triblock copolymer

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