The use of Langmuir–Blodgett films as recording layers in optical information carriers

Chechel, O V; Nikolaev, Eugene

doi:10.1070/rc1990v059n11abeh003579

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…It is noteworthy that the reversible photoisomerization of azobenzene derivatives can be restricted in the case of pure LB films. [108][109][110] Copolymers with only a certain percentage of azo side groups are used in most cases. The irreversible isomerization occurring in homopolymers is attributed to the high energy of repacking the molecules in the monolayers.…”

Section: Some Properties Resulting From Isomerization In Azo Polymersmentioning

confidence: 99%

Recent developments in aromatic azo polymers research

Xie¹,

Natansohn²,

Rochon³

1993

Chem. Mater.

558

408

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The photochemical and thermal cis-to-trans isomerization of aromatic azo groups covalently bonded within polymers and its practical consequences as well as some other recent applications are reviewed. The kinetics and mechanism of the isomerization of azo polymers are briefly presented, and then several recent developments in azo polymers research are discussed. They include liquid crystallinity, nonlinear optical properties, monolayer assemblies, and the lightinduced birefringence and dichroism. Some of the phase transitions of liquid-crystalline azo polymers can be induced photochemically by the azo groups isomerization. Second-order optical nonlinearity can be obtained in polymers with donorand acceptor-substituted azo groups. Using the Langmuir-Blodgett technique, azo polymer monolayers can be built and used as "command surfaces" of liquid-crystal films. The light-induced birefringence is a reorientation phenomenon which is a consequence of the trans-cis-trans isomerization. Future possible applications for a variety of practical devices, such as display devices, optical modulators, optical waveguides, holography, and reversible optical storage are mentioned.

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Section: Some Properties Resulting From Isomerization In Azo Polymersmentioning

confidence: 99%

Recent developments in aromatic azo polymers research

Xie¹,

Natansohn²,

Rochon³

1993

Chem. Mater.

558

408

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“…Photochromism, observed for many PDAs, can be used for information recording and storage 10) . The creation of various types of sensors was also reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Solid state photopolymerization of modified amphiphilic diynes in multilayers

Алексеев¹,

Domnin

Grudinin

et al. 2000

Macromol. Chem. Phys.

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Solid state topochemical photopolymerization of amphiphilic diynes modified at hydrophobic part of molecule was under the study. All compounds formed stable monomer monolayers on an aqueous subphase surface and were transferred as multilayers onto quartz substrates by the Langmuir‐Blodgett technique. The changes of the multilayer absorption spectra as a function of UV irradiation time have been investigated. It is shown that the insertion of an ester or sulfonyl group into the hydrophobic part of the diyne molecule increased their activity in topochemical photopolymerization reaction. The polymer absorbancies decreased under excess UV irradiation due to the decomposition of polydiacetylenic chains in the multilayer structure.

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“…Descrevemos a seguir os principais métodos de preparação de filmes. A técnica LB tem sido também utilizada na preparação de filmes de materiais poliméricos com azo-benzenos 34,35 . Um dos resultados interessantes obtidos em São…”

Section: Métodos De Preparação De Filmesunclassified

Estudo das propriedades de armazenamento óptico e grades de relevo em poliuretano derivado de azo-benzeno

Neves¹

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Fundamentos________________________________________________________________________ 2.1 Moléculas azo-aromáticas _____________________________________________________ 2.2 A foto-isomerização de moléculas azo-benzênicas__________________________________ 2.3 Exemplos de moléculas azobenzênicas ___________________________________________ 2.4 Cristalinidade, Tg, Tm e volume livre de um polímero _____________________________ 2.5 Equação de Debye para as taxas de alinhamento e relaxação dos dipolos _____________ 2.6 Grades de relevo ____________________________________________________________ ______________________________________________________________ Capítulo III __________________________________________________________________________________ Materiais e métodos de preparação de filmes______________________________________________ 3.1 Produção de polímeros fotoisomerizáveis _______________________________________ 3.2 Síntese do polímero do tipo poliuretano _________________________________________ 3.3 Métodos de preparação de filmes ______________________________________________ 3.3.1 Filmes LB______________________________________________________________ 3.3.2 Filmes Automontados_____________________________________________________ 3.3.3 Filmes preparados por centrifugação _________________________________________ 3.3.4 Filmes preparados por derramamento ________________________________________ ____________________________________________________________ CAPÍTULO IV __________________________________________________________________________________ MÉTODOS EXPERIMENTAIS________________________________________________________ 4.1 Preparação das amostras_____________________________________________________ 4.2 Espectroscopia ultravioleta-visível _____________________________________________ 4.3 Método de produção e medida da birrefringência. ________________________________ 4.4 Método de produção das grades de relevo _______________________________________ 4.5 Microscopia de força atômica _________________________________________________ 4.6 Medida de espessura de filmes (perfilometria) ___________________________________ 4.7 Método de gravação de imagens de birrefringência no filme polimérico ______________

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The use of Langmuir–Blodgett films as recording layers in optical information carriers

Cited by 3 publications

References 29 publications

Recent developments in aromatic azo polymers research

Recent developments in aromatic azo polymers research

Solid state photopolymerization of modified amphiphilic diynes in multilayers

Estudo das propriedades de armazenamento óptico e grades de relevo em poliuretano derivado de azo-benzeno

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