Synthesis of alicyclic polymers and characterization of chemical amplified positive photoresists having the same

Liu, Jui Hsiang; Hsieh, Ching Dong; Tseng, Chin Chung

doi:10.1002/app.21324

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…In our previous studies,26–30 we synthesized a series of chiral dopants and chiral polymers and investigated their optical properties and applications on liquid‐crystal cells and recording films. In this investigation, we aimed to provide new compounds, in particular, polymerizable and/or mesogenic compounds, which were suitable as photoisomerizable compounds and for other uses, were easy to synthesize in a large range of derivatives, and preferably showed broad liquid‐crystalline phases with high clearing points.…”

Section: Introductionmentioning

confidence: 99%

Randomized controlled trials of treatments for hematologic malignancies

Yanada

Narimatsu

Suzuki

et al. 2007

Cancer

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To investigate the effects of photoisomerizable azobenzene segments on the liquid‐crystalline characteristics and thermal properties of polymers, a series of liquid‐crystalline homopolymers and copolymers with azobenzene segments was synthesized. The azobenzene contents of the copolymers were estimated with elemental analysis. The photoisomerization of the azobenzene derivatives was studied with ultraviolet–visible (UV–vis) spectroscopy. The UV–vis absorption of the copolymers was found to be parallel with the content of the azobenzene segments. UV irradiation was found to cause a decrease in the copolymer transmittance around 355 nm due to the photoinduced isomerization from entgegen (E) to zusammen (Z). The phase‐transition temperatures and molecular weights of the polymers were investigated with differential scanning calorimetry and gel permeation chromatography, respectively. The variation in the phase‐transition temperature of the homopolymers before and after UV (365 nm) irradiation was investigated. The bended Z structure was found to disturb the order of the orientation of liquid crystals and to lower the phase‐transition temperature. The appearance of the polymer film was changed from opaque to clear after sufficient UV irradiation. The image recording of the polymer films was achieved after UV irradiation through a mask with pictures. The stability and reliability of the Nematic‐Isotropic phase transition of the homopolymers was evaluated with repeated cycles of 365‐nm UV irradiation and heating at 130°C. After the recycle phase transition was repeated nine times, no significant decay in the response and transmittance could be found. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 2006

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Section: Introductionmentioning

confidence: 99%

Randomized controlled trials of treatments for hematologic malignancies

Yanada

Narimatsu

Suzuki

et al. 2007

Cancer

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Synthesis and physical properties of liquid‐crystalline copolymers with azobenzene segments

Liu

Hsieh

2005

J of Applied Polymer Sci

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ABSTRACT:To investigate the effects of photoisomerizable azobenzene segments on the liquid-crystalline characteristics and thermal properties of polymers, a series of liquid-crystalline homopolymers and copolymers with azobenzene segments was synthesized. The azobenzene contents of the copolymers were estimated with elemental analysis. The photoisomerization of the azobenzene derivatives was studied with ultraviolet-visible (UV-vis) spectroscopy. The UV-vis absorption of the copolymers was found to be parallel with the content of the azobenzene segments. UV irradiation was found to cause a decrease in the copolymer transmittance around 355 nm due to the photoinduced isomerization from entgegen (E) to zusammen (Z). The phase-transition temperatures and molecular weights of the polymers were investigated with differential scanning calorimetry and gel permeation chromatography, respectively. The variation in the phase-transition temperature of the homopolymers before and after UV (365 nm) irradiation was investigated. The bended Z structure was found to disturb the order of the orientation of liquid crystals and to lower the phase-transition temperature. The appearance of the polymer film was changed from opaque to clear after sufficient UV irradiation. The image recording of the polymer films was achieved after UV irradiation through a mask with pictures. The stability and reliability of the Nematic-Isotropic phase transition of the homopolymers was evaluated with repeated cycles of 365-nm UV irradiation and heating at 130°C. After the recycle phase transition was repeated nine times, no significant decay in the response and transmittance could be found.

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Contrast ratio of colorant film: Theoretical consideration and effect of polymeric binder

Park

2010

J of Applied Polymer Sci

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We made theoretical approaches concerning the optical property of a pigment-containing system to understand the conditions under which an enhanced contrast can be achieved. Maintaining a uniform distribution of pigment particles in thin film well, as in millbase dispersion, is considered critical for a higher contrast. As a specific case, we estimated the effect of a polymeric binder on the contrast ratio. Chemical composition of the dispersion binder has a huge effect, and carboxylate in its long side chain plays a favorable role. Using this binder, we were able to obtain a smooth surface and uniformity, and an enhancement of contrast ratio in the colorant film.

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Synthesis of alicyclic polymers and characterization of chemical amplified positive photoresists having the same

Cited by 4 publications

References 27 publications

Randomized controlled trials of treatments for hematologic malignancies

Randomized controlled trials of treatments for hematologic malignancies

Synthesis and physical properties of liquid‐crystalline copolymers with azobenzene segments

Contrast ratio of colorant film: Theoretical consideration and effect of polymeric binder

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