Photoresponsive Behavior of Azobenzene-Based (Meth)acrylic (Co)polymers in Thin Films

Haitjema, Hj; Vonmorgen, Gl; Tan, Y.Y.; Challa, G.

doi:10.1021/ma00099a040

Cited by 45 publications

(42 citation statements)

References 3 publications

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“…In fact, several works have been reported concerning the out-of-plane alignment behavior by using unpolarized light. [114][115][116][117] From the viewpoint of 3D manipulation of molecules by light, promising results have been obtained for LCPs: by changing the incident angle of the actinic unpolarized light, one can control the alignment of AZ and mesogenic moieties in a 3D fashion, precisely along the propagation direction of the actinic light at room temperature (Figure 10 B). [ 118 ] Furthermore, it has been also confi rmed that the induced 3D alignment of molecules is very stable below T g of the LCPs.…”

Section: Photoinduced Large Change In Birefringencementioning

confidence: 99%

Photocontrollable Liquid‐Crystalline Actuators

2011

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Section: Photoinduced Large Change In Birefringencementioning

confidence: 99%

Photocontrollable Liquid‐Crystalline Actuators

2011

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“…This thermal back reaction can be enhanced by light, temperature, and solvents. 5,13,14 Transformation from Z to E was enhanced using visible light on sample 3a. From Figure 4, it was revealed that sample 3a changed its advancing contact angle from 98°to 90°(E to Z) after 15-min UV irradiation and thermal relaxation occurred within 15 min when visible light irradiation had been used.…”

Section: Photoisomerization and Wettabilitymentioning

confidence: 99%

“…The thermal back-isomerization rate was found to depend on the type of the chromophore. 5,6 The azobenzene groups without any substituents (electron-donor or electron-acceptor groups) showed relatively slower thermal Z 3 E isomerization. 6 Similar results were observed in the case of polyolefin film bearing azobenzene and the substituted azobenzene group.…”

Section: Effect Of Structure Of Chromophore On Isomerizationmentioning

confidence: 99%

“…Besides LC polymers, a number of studies have been reported on the E º Z isomerization of azobenzene moieties doped in or covalently incorporated into both amorphous polymers and sol-gel glasses. [5][6][7][8][9] These studies indicate that the isomerization of the azobenzene moiety depends on various factors such as the polarity, viscosity of the local environment, and free-volume distribution around the moiety. It is also observed that the kinetics of the thermal cis-trans back relaxation of a chromophore embedded in a polymer matrix differs from the behavior in solution.…”

Section: Introductionmentioning

confidence: 99%

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Isomerization behavior of aromatic azo chromophores bound to semicrystalline polymer films

Sarkar

Sivaram

2001

J of Applied Polymer Sci

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ABSTRACT:The cis-trans isomerization of azo chromophores covalently bound to semicrystalline polymer films was investigated. Various azo chromophores were introduced onto the functionalized semicrystalline polymer films by a chemical transformation reaction and their isomerization behavior was investigated by UV-visible spectroscopy and a contact-angle goniometer. The thermal Z 3 E isomerization rate of the azo moiety covalently bound to low-density polyethylene (LDPE) and polypropylene (PP) films was determined. The rate of thermal isomerization was also compared between amorphous and semicrystalline polymer films bearing azo chromophores. The effect of the intramolecular steric factor and the nature of chromophores was studied on the thermal isomerization rate of the polymer films.

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“…Side-chain azobenzene polymers have been intensively investigated [1][2][3][4][5][6][7][8] in the last decade because of their potential applications in optical storage and holographic optical elements. Their efficiency is due to the large photoinduced linear birefringence (up to 10 -2 ) assigned to the photoinduced orientation of the azobenzene moieties.…”

Section: Introductionmentioning

confidence: 99%

Diffraction from polarization holographic gratings with surface relief in side-chain azobenzene polyesters

et al. 1998

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We investigate the polarization properties of holographic gratings in side-chain azobenzene polyesters in which an anisotropic grating that is due to photoinduced linear and circular birefringence is recorded in the volume of the material and a relief grating appears on the surface. A theoretical model is proposed to explain the experimental results, making it possible to understand the influence of the different photoinduced effects. It is shown that at low intensity the polarization properties of the diffraction at these gratings are determined by the interaction of the linear and circular photobirefringences, and at larger intensity the influence of the surface relief dominates the effect of the circular anisotropy. Owing to the high recording efficiency of the polyesters, the ±1-order diffracted waves change the polarization interference pattern during the holographic recording, resulting in the appearance of a surface relief with doubled frequency.

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Photoresponsive Behavior of Azobenzene-Based (Meth)acrylic (Co)polymers in Thin Films

Cited by 45 publications

References 3 publications

Photocontrollable Liquid‐Crystalline Actuators

Photocontrollable Liquid‐Crystalline Actuators

Isomerization behavior of aromatic azo chromophores bound to semicrystalline polymer films

Diffraction from polarization holographic gratings with surface relief in side-chain azobenzene polyesters

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