Photoalignment Control of Liquid Crystals on Photo-Cross-Linkable Methacrylate Copolymer Films Comprising 4-(4′-Methoxycinnamoyloxy)Biphenyl Side-Group

Kawatsuki, Nobuhiro; Kawakami, Tetsuro; Yamamoto, Tohei

doi:10.1080/10587250108029984

Cited by 9 publications

(10 citation statements)

References 19 publications

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“…This result differs from that of the as-coated PMCB6M film where the absorption band slightly decreases when the incident angle of the probe beam increases due to partial orientation of the mesogenic side groups parallel to surface (Figure S2b). The mesogenic side groups in several LC polymers exhibit out-of-plane orientation upon film formation; the main-chain, spacer length, and end groups of the mesogenic side groups affect both the in-plane and out-of-plane orientations. , For the as-coated PMCB10M, a long alkylene spacer generates the partial out-of-plane orientation in the bulk (Table , n z > n x = n y ).…”

Section: Resultsmentioning

confidence: 99%

“…The mesogenic side groups in several LC polymers exhibit out-of-plane orientation upon film formation; the main-chain, spacer length, and end groups of the mesogenic side groups affect both the in-plane and out-ofplane orientations. 20,31 For the as-coated PMCB10M, a long alkylene spacer generates the partial out-of-plane orientation in the bulk (Table 1, n z > n x = n y ).…”

Section: Methodsmentioning

confidence: 99%

“…To control the out-of-plane orientation in copolymethacrylates comprised of photo-crosslinkable and nonphotoresponsive mesogenic side groups using LPUV light, the end groups of the nonphotoresponsive mesogenic side groups play an important role in the thermally stimulated out-of-plane orientation. 20 Yaroshchuk et al used a null ellipsomerty technique to investigate the 3D orientational configurations of the cinnamoyl fragments in poly-(vinylcinnamate). 27 Additionally, we briefly reported that the induction of the out-of-plane reorientation of a polymethacrylate with MCB side groups connected via long alkylene spacers (PMCB10M, Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…In the meantime, the photoinduced out-of-plane molecular orientation using photoresponsive polymeric films has been examined to fabricate an optical film with mesogens in its liquid crystalline polymer possessing a homeotropic internal structure (a positive C optical film) and homeotropic LC alignment. − Furthermore, controlling the in-plane and out-of-plane orientations can adjust the three-dimensional (3D) birefringence characteristics of birefringent films. Additionally, simultaneous controlling the in-plane and out-of-plane orientations is important to adjust the refractive index ellipsoid, especially when designing retardation films.…”

Section: Introductionmentioning

confidence: 99%

“…We have studied photoresponsive polymeric films that are transparent in the visible region. To control the out-of-plane orientation in copolymethacrylates comprised of photo-cross-linkable and nonphotoresponsive mesogenic side groups using LPUV light, the end groups of the nonphotoresponsive mesogenic side groups play an important role in the thermally stimulated out-of-plane orientation . Yaroshchuk et al used a null ellipsomerty technique to investigate the 3D orientational configurations of the cinnamoyl fragments in poly(vinylcinnamate) .…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the Photoinduced Orientation Structure in the Bulk and at the Near-Surface of a Photoalignable Liquid Crystalline Polymer Film

et al. 2015

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The thermally stimulated photoinduced inplane and out-of-plane molecular reorientation behaviors of a polymethacrylate film comprised of 4-methoxycinnnamoylbiphenyl (MCB) side groups connected with a decylene spacer (PMCB10M) are compared in the bulk (>10 nm), at the inner-surface (∼10 nm), and at the near-surface (<2 nm) using polarized UV absorption and near-edge X-ray absorption fine structure (NEXAFS) spectroscopies. The biaxial reorientation characteristics in the bulk of the PMCB10 M films can be controlled by irradiating with linearly polarized (LP) UV light and subsequent annealing to generate self-organization of the MCB side groups. However, the homogeneous in-plane orientation at the near-surface, which can introduce homogeneous nematic low-molecular-weight liquid crystal mixture alignment, is observed regardless of the self-organization process. The differences in the orientation characteristics arise from long alkylene spacer and bulky mesogenic side groups.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of the Photoinduced Orientation Structure in the Bulk and at the Near-Surface of a Photoalignable Liquid Crystalline Polymer Film

et al. 2015

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Soluble Polyimide Containing a Photoreactive 2‐Styrylpyridine Derivative as the Side Group: Synthesis and Characterization

Kim

Ahn

Kim

2004

Macro Chemistry & Physics

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Summary: We describe the synthesis and characterization of a soluble photoreactive polyimide. The precursor of the polyimide was prepared from 2,2′‐bis{4‐(3,4‐dicarboxyphenoxy)phenyl}hexafluoropropane dianhydride and 3,3′‐hydroxy‐4,4′‐diaminobiphenyl; the photoreactive polyimide was then prepared by the polymer reaction of the hydroxyl groups in the precursor polymer with 2‐{2‐[4‐(6‐hydroxyhexyloxy)phenyl]ethenyl}pyridine as a photoreactive 2‐styrylpyridine derivative. The photoreactive polymer and its precursor polymer were soluble in various polar organic solvents, and their thin flexible films were easily formed by solution casting. The initial decomposition temperatures of the former and latter polymers were 350 and 470 °C, respectively. The extent of the photochemical reaction of the photoreactive polymer film was measured to be 65.8% at an exposure energy of 1.5 J/cm2. The transmittance of the film was found to be approximately 92% at room temperature and approximately 85% at 200 °C. These results suggest that the polyimide is a photosensitive polymer with good photosensitivity and high optical transparency. The dichroic ratios of the film were between 0.023 and 0.025 when exposed to linearly polarized UV light (LPUVL). The liquid crystal in the film cell was perpendicularly oriented to the electric vector of LPUVL.

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Liquid crystal photoalignment by a polymaleimide having a photoreactive 2-styrylpyridine derivative as aN-substituent

et al. 2009

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Photoalignment Control of Liquid Crystals on Photo-Cross-Linkable Methacrylate Copolymer Films Comprising 4-(4′-Methoxycinnamoyloxy)Biphenyl Side-Group

Cited by 9 publications

References 19 publications

Comparison of the Photoinduced Orientation Structure in the Bulk and at the Near-Surface of a Photoalignable Liquid Crystalline Polymer Film

Comparison of the Photoinduced Orientation Structure in the Bulk and at the Near-Surface of a Photoalignable Liquid Crystalline Polymer Film

Soluble Polyimide Containing a Photoreactive 2‐Styrylpyridine Derivative as the Side Group: Synthesis and Characterization

Liquid crystal photoalignment by a polymaleimide having a photoreactive 2-styrylpyridine derivative as aN-substituent

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