Synthesis of liquid-crystalline poly (meth) acrylates with 4-trifluoromethoxy-azobenzene mesogenic side-groups

Prescher, Dietrich; Thiele, Thomas; Ruhmann, Ralf; Schulz, Günter

doi:10.1016/0022-1139(95)03291-k

Cited by 35 publications

(27 citation statements)

References 9 publications

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“…The absorption bands at 2920 and 2850 cm −1 are characteristic of the asymmetric and symmetric stretching vibrations of CH 2 groups of the CF 3 AZO − anion (Xu et al, 2006). The other two strong absorption bands at 1245 and 1135 cm −1 are identified as the symmetric and asymmetric of stretching bands of the CF 3 − functional groups, respectively (Prescher et al, 1995(Prescher et al, , 1996. The peak at 1700 cm −1 in the spectrum of the free acid form of CF 3 AZO (Fig.…”

Section: Crystal Structure and Morphology Of Znal-cf 3 Azo-ldh Hybridmentioning

confidence: 94%

Formation of photo- and thermo-stable layered double hydroxide films with photo-responsive wettability by intercalation of functionalized azobenzenes

Chen

Zhang

et al. 2009

Chemical Engineering Science

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Section: Crystal Structure and Morphology Of Znal-cf 3 Azo-ldh Hybridmentioning

confidence: 94%

Formation of photo- and thermo-stable layered double hydroxide films with photo-responsive wettability by intercalation of functionalized azobenzenes

Chen

Zhang

et al. 2009

Chemical Engineering Science

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“…The trifluoromethoxyazobenzene-containing monomer was obtained by a multistep synthesis as described earlier. 5 The average molecular mass was 59 000.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Modeling of Cis−Trans Photoisomerization of a Trifluoromethoxy-Substituted Metacrylate Copolymer Monolayer at a Fluid Interface

1999

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Spread monolayers of a photochromic trifluoromethoxy-substituted metacrylate copolymer were characterized by Π/A isotherms under the condition of mainly trans or cis conformation of the photochromic side chains and during the trans restoration process. The isotherms of the individual components, i.e., trans and cis conformation, respectively, and those of variable trans/cis content were described by a new theoretical approach, which takes into account a possible side chain aggregation. A good agreement between the experimental Π/A isotherms and the model was achieved for small aggregation numbers and a limited range of surface coverage. The trans/cis content during the trans recovery process was calculated by using the parameters of the individual components. The model correctly reflects the main characteristics of the individual components and the cistrans transformation process: the minimum area demand per repeating unit of the trans conformation is smaller than that of the cis conformer; the aggregate tendency is higher for the trans conformers at low surface coverage; the trans/cis ratio increases during the trans restoration, where the content depends on the surface pressure.

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“…[11] The pM2AzOCF 3 showed an endothermic peak at 154 C owing to a transition from a mesophase to an isotropic phase, while no peak was observed for pM0AzOCF 3 . The glass-transition temperature and clearing temperature of bulk-polymerized pM2AzOCF 3 were slightly higher than those of a polymer prepared in solution, [10] suggesting that these pM0AzOCF 3 and pM2AzOCF 3 may be more suitable for thermally stable LC photoalignment, owing to their higher molecular weights.…”

Section: Synthesis and Characterization Of Azobenzene-containing Polymentioning

confidence: 98%

“…The bulk polymerization provided higher molecular weights than solution polymerization. [10] Differential scanning calorimetry (DSC) measurements revealed glass-transition temperatures T g = 97 C and 87 C for pM0AzOCF 3 and pM2AzOCF 3 , respectively. When pM0AzOCF 3 solid that had previously been heated above T g was cooled to room temperature, polarized optical microscopy confirmed the emergence of optical anisotropy.…”

Section: Synthesis and Characterization Of Azobenzene-containing Polymentioning

confidence: 99%

Photogeneration of High Pretilt Angles of Nematic Liquid Crystals by Non‐Polarized Light Irradiation of Azobenzene‐Containing Polymer Films

Furumi¹,

Ichimura

2004

Adv Funct Materials

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A vertical‐alignment (VA) cell of nematic liquid crystals (LCs) was prepared using photoirradiated thin films of a poly(methacrylate) with mesogenic moieties of 4‐trifluoromethoxyazobenzene as the side chains. Optical anisotropy was generated by oblique irradiation of the azobenzene‐containing polymer films with non‐polarized UV light, followed by annealing treatment to enhance the photodichroism, which displayed thermal stability. The combination of oblique exposure to non‐polarized UV light and subsequent annealing treatment brought about high pretilt angles of nematic LCs so that a photoaligned VA LC cell was fabricated. The photopatterned LC cell exhibited electro‐optical properties with excellent optical quality when a voltage was applied even after heating at 100 °C for several hours.

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Synthesis of liquid-crystalline poly (meth) acrylates with 4-trifluoromethoxy-azobenzene mesogenic side-groups

Cited by 35 publications

References 9 publications

Formation of photo- and thermo-stable layered double hydroxide films with photo-responsive wettability by intercalation of functionalized azobenzenes

Formation of photo- and thermo-stable layered double hydroxide films with photo-responsive wettability by intercalation of functionalized azobenzenes

Characterization and Modeling of Cis−Trans Photoisomerization of a Trifluoromethoxy-Substituted Metacrylate Copolymer Monolayer at a Fluid Interface

Photogeneration of High Pretilt Angles of Nematic Liquid Crystals by Non‐Polarized Light Irradiation of Azobenzene‐Containing Polymer Films

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