Azo polymers for reversible optical storage. 11 poly {4,4′-(1-Methylethylidene)Bisphenylene 3-[4[(4-Nitrophenylazo)Phenyl]-3-Aza-Pentanedioate}

Meng, Xian Sheng; Natansohn, Almeria; Rochon, P.

doi:10.1002/(sici)1099-0488(199606)34:8<1461::aid-polb9>3.0.co;2-v

Cited by 52 publications

(41 citation statements)

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“…The molecular orientation in the polymer films can be quantitatively characterized by the birefringence measurement, polarized UV-Vis spectroscopy, and polarized IR spectroscopy [14,15,24,25]. In past decades, the correlation between the photoinduced orientation and molecular structures has been extensively studied for both liquid crystal azo polymers [12,13,[29][30][31][32][33], and amorphous azo polymers [16][17][18][19][20][21][22][23][24]. Understanding of the structure-property relationships has been used to elucidate the mechanism and develop materials with better performance.…”

Section: Introductionsupporting

confidence: 63%

Photoinduced orientation and cooperative motion of three epoxy-based azo polymers

Wang

2011

Polym. Bull.

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In this work, photoinduced orientation of three epoxy-based polymers bearing different type azo chromophores was studied. The epoxy-based azo polymers were synthesized through post-polymerization azo-coupling reactions based on an epoxy-based precursor polymer (BP-AN), which was synthesized by the step polymerization between bisphenol-A diglycidyl ether and aniline. The chromophore orientation and cooperative motion of the main-chain groups were studied by birefringence characterization, polarized infrared spectroscopy, and two-dimensional (2D)-IR correlation spectroscopy (COS). The results show that the orientation behavior of the epoxy-based azo polymers is closely related with the electronwithdrawing groups on the azo chromophores. The azo polymer BP-AZ-CN, which contains azo chromophores with cyano as the electron-withdrawing group, shows the fastest birefringence growth rate. The azo polymer BP-AZ-CA, containing carboxyl as the electron-withdrawing group, possesses high birefringence residual value and the highest saturated orientation degree in the series. Cooperative motion between azobenzene moieties and non-photochromic polymer backbone was revealed by polarized FTIR and 2D-IR COS. The photoinduced anisotropy is a result of the orientation of both azo chromophore and polymer main-chain. The understanding of the structure-property relationships can be used to develop materials with better performance for data storage and other applications.

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Section: Introductionsupporting

confidence: 63%

Photoinduced orientation and cooperative motion of three epoxy-based azo polymers

Wang

2011

Polym. Bull.

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“…When the pump is on, a fast process and a slow process in the buildup of birefringence can be seen under irradiation. For azobenzene LC polymer, the fast process is related to the local movement of azobenzene groups in the trans-cis-trans photo-isomerization, and the slow process is attributed to the movement of azobenzene groups linked to the LC polymeric chain [15,16]. As the pump intensity increases, the saturation value of birefringence reaches a maximum.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear optical properties and photoinduced anisotropy of an azobenzene ionic liquid–crystalline polymer

Zhang

Wang

et al. 2010

Optics Communications

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“…First one is connected with the decomposition of chromophores in polymer chain. 8 In DSC spectra an exotherm peak observed at about 250 • C probably corresponds to decomposition of nitro group. Initial decomposition temperature (IDT ) is in the similar region of temperature between 230-220 • C for all polymers.…”

Section: Resultsmentioning

confidence: 99%

New Azobenzene Chromophores as Monomers for Synthesis of Polyesters

Schab‐Balcerzak

Grabiec

Sęk

et al. 2003

Polym J

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ABSTRACT:Two new azo-chromophores: 2,4-dihydroxy-4 -nitroazobenzene and 2,4-dihydroxy-4-azo-(4 -nitroazobenzeno)benzene have been prepared. These diols have been applied as monomers for polyesters synthesized in condensation with diacid chlorides: isophthaloyl chloride and sebacoyl chloride. The copolymers consist of mixture of two new diols and chlorides have been obtained as well. The polymers were identified by infrared and elemental analysis. Character of polymers was determined using X-ray spectroscopy. Thermal properties of polyesters such as glass transition temperature and thermal stability were investigated using differential scanning calorimetry (DSC) method and thermogravimetric analysis. These polymers with azobenzene groups could find potential applications as holographic recording materials. The preliminary investigations of optical grating recording were carried out.KEY WORDS Polyesters / Chromophores / Azo Dye / Photoisomerization / Holographic Recording / Azobenzene containing polymers are of special interests with respect to the reversibility of the photorearrangement, a number of interesting effects and potential applications. Such polymers in the form of solid films have been investigated for potential technological applications. It is intension to use this kind of polymers in such applications as optical information storage, optical information processing, aligning layers for liquid crystals, optical switching devices and diffractive optical elements among others. 1 The use of polymeric materials for optical applications offers many advantages in comparison with the use of inorganic materials, among them being the low weight of the optical components, the good mechanical properties of polymers, and the ease of manufacturing technical parts. 2 Many of optical applications are possible due to efficient photoisomerization and photoinduced processes such as photo-induced orientation resulting in anisotropic films or in light induced diffusion generating surface relief gratings (Scheme 1).Azobenzene groups are known to exist in two isomeric states, a thermodynamically stable trans and a meta-stable cis form. When irradiated with light of appropriate wavelength, the azobenzene chromophores undergo a reversible trans ⇒ cis ⇒ trans photoisomerization process. Linearly polarized light causes a cooperative-orientation of the azobenzene moieties and other segments of the polymers perpendicular to the electric field vector of the incident light. This results in the induction of anisotropy in the films causing a birefringence and dichroism. 1 This process can be used to Scheme 1. Photoisomerization of azobenzene groups upon linearly polarized light and photoorientation.generate erasable holographic gratings in the volume. On continued exposure the light driven diffusion process causes the formation of surface relief gratings in the same type of polymers.So the amorphous azobenzene-containing polymers are able to reversibly store optical information. Holography is a technique for memorizing the amplitude ...

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Azo polymers for reversible optical storage. 11 poly {4,4′-(1-Methylethylidene)Bisphenylene 3-[4[(4-Nitrophenylazo)Phenyl]-3-Aza-Pentanedioate}

Cited by 52 publications

References 1 publication

Photoinduced orientation and cooperative motion of three epoxy-based azo polymers

Photoinduced orientation and cooperative motion of three epoxy-based azo polymers

Nonlinear optical properties and photoinduced anisotropy of an azobenzene ionic liquid–crystalline polymer

New Azobenzene Chromophores as Monomers for Synthesis of Polyesters

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