Jui‐Hsiang Liu

National Cheng Kung University

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Chun‐Yen Liu

National Cheng Kung University

Balamurugan Rathinam

National Yunlin University of Science and Technology

A. V. Emelyanenko

Lomonosov Moscow State University

Yan‐Song Zhang

University of Luxembourg

Fu‐Ren Tsai

Kun Shan University

Po‐Chih Yang

Yuan Ze University

Hsien‐Jung Hung

National Cheng Kung University

Jue‐Cheng Kuo

National Cheng Kung University

Yi‐Hong Chiu

National Cheng Kung University

Kiichi Takemoto

United Nations University Institute for Sustainability and Peace

Cooperative Institutions

National Cheng Kung University

National Taiwan University of Science and Technology

Osaka University

National Taiwan University

National Sun Yat-sen University

Tainan University of Technology

Russian Academy of Sciences

National Yang Ming Chiao Tung University

Museum of Japanese Art Yamato Bunkakan

National Yunlin University of Science and Technology

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Syntheses and characterization of photocrosslinkable poly(amic acid‐co‐urea)s with diazoresin

Journal of Applied Polymer Science (1998)

Jui‐Hsiang Liu Shin‐Yen Lee Fu‐Ren Tsai

Characterization

10.1002/(sici)1097-4628(19981219)70:12<2401::aid-app12>3.3.co;2-2

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Preparation and characterization of molecular photoresists: Crosslinkable positive and water developable negative tones

Journal of Applied Polymer Science (2008)

Yin‐Yin Liao Jui‐Hsiang Liu

Abstract The development of a water‐developable negative photoresist from β‐CD using an acid‐catalyzed chemical amplification method is investigated here. Tertiary butoxyl protected β‐cyclodextrin ( t ‐BOC‐CD) is also synthesized and used to prepare a positive photoresist. Glutaraldehyde is added as a crosslinking agent for both positive and negative photoresists. Deprotection of t ‐BOC‐CD is accelerated by a photo‐induced acid. In the presence of glutaraldehyde and acid, both the deprotected t ‐BOC‐CD and β‐cyclodextrin are crosslinked. The introduction of a t ‐butoxyl group into the β‐CD molecule and the addition of glutaraldehyde into the β‐CD molecules are both found to decrease the crystallinity of the molecules, improving the resist film properties. The etching resistance of both positive and negative photoresist films is improved by the crosslinking method. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Photoresist

Glutaraldehyde

10.1002/app.28597

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Citations (16)

Chiral effect on the self-assembly of chiral molecules synthesized from cholesterol

Journal of the Taiwan Institute of Chemical Engineers (2018)

Sri Fitriyani Chun‐Yen Liu Yuyun Yuniarti Jui‐Hsiang Liu

Small-angle X-ray scattering

10.1016/j.jtice.2018.05.019

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Fabrication and optical characterization of imprinted broad-band photonic films via multiple gradient UV photopolymerization

Journal of Polymer Science Part B Polymer Physics (2017)

Yan‐Song Zhang A. V. Emelyanenko Jui‐Hsiang Liu

A structured broad-band photonic film is fabricated by a novel method using multiple gradient UV-induced polymerization in the presence of cholesteric liquid crystals (CLCs). Here, imprinting and broadening of the reflection band of chiral nematic mesophase cells are achieved via controlled UV polymerization. The intensity gradient of UV light is modified by the distance between UV lamp and sample cell, which affects the polymerization rate and leads to the formation of imprinted helical constructions with different pitches. In this study, a comparison of new design process with traditional UV polymerization process is carried out. After seven cycles of gradient UV polymerization, the imprinted photonic construction exhibited a broadened reflection band and Bragg reflection, even for isotropic materials. Because of this, the reflection bandwidth showed a 70% improvement. Additionally, two stacked imprinted cells with different pitches can reflect incident light with a bandwidth over the visible wavelength range of 480–680 nm. A broad-band photonic polymer film can be imprinted using multiple gradient UV photopolymerization in the presence of CLCs. Forming a UV intensity gradient and controlling the rate of photopolymerization are key factors in broadening the reflection band. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1427–1434

10.1002/polb.24392

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Citations (9)

Synthesis of photoisomeric azobenzene monomers and model compound effect on electric–optical properties in PDLC films

Journal of Applied Polymer Science (2005)

Jui‐Hsiang Liu Fuh‐Tsang Wu

Abstract A series of azobenzene monomers and related model compounds with various side‐chain lengths were synthesized. The electrooptical properties of a polymer‐dispersed liquid crystal (PDLC) were verified by side‐chain methoxy azobenzene in various chain lengths ( n = 3, 6, 11). The properties under various voltages were measured and the effect of extra voltage on the transmittance of PDLC was researched as well. The experiment demonstrated the validity of employing these side chain methoxy azobenzene materials in electrooptical devices. The azobenzene model compound showed better electric–optical and thermal–optical properties, having a higher contrast ratio (CR = 689) and a lower saturation voltage (4.7 V/μm). All the azobenzene molecules can be photoisomerized through UV light irradiation, following the mechanism of isomerization. The reversible photo and heat isomerization property was studied. The cis ‐azobenzene that was transformed from the trans ‐azobenzene irradiated by UV light can decrease the clearing point of the liquid crystal phase. We used this unique characteristic to record image patterns and it worked successfully. We synthesized the azobenzene monomers can stabilize the PDLC and their relative model compounds with various alkyl chain lengths even got better electric–optical effects. We found that azobenzene monomer shows different behaviors in the electric–optical property from its relative model compound. The difference between the systems were explained using a proposed model. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 721–732, 2005

Azobenzene

Side chain

10.1002/app.21021

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Citations (22)

Synthesis and characteristics of chiral polymers with camphanediol moieties

Die Angewandte Makromolekulare Chemie (1995)

Jui‐Hsiang Liu Fu‐Ren Tsai Yuh‐Chung ‐C Lai

Abstract Optically active exo,exo‐2,3‐camphanediol (CPO) was synthesized from (+)‐camphor. The chiral polymers poly(CPO‐co‐TDI) and poly(CPO‐co‐IPDI) were synthesized by step polymerization of chiral compound CPO with toluene‐2,4‐diisocyanate (TDI) and isophorone diisocyanate (IPDI). Effects of solvents, reaction time and temperature on the polymerization were investigated. To investigate the stereo structure of the chiral polymers, two kinds of model compounds, exo‐exo‐2,3‐bornylene N,N′‐diphenyldicarbamate and exo,exo‐2,3‐bornylene N,N′‐dipropyldicarbamate, related to the prepared polymers were synthesized. Chiroptical characteristics and stereo structures of the chiral polymers were investigated by using a circular dichroic spectrometer. Effects of temperature and solvents on the specific rotation of the chiral polymers were evaluated. The results obtained in this investigation suggest that the synthesized chiral polymers have no one‐handed helix conformation.

Isophorone diisocyanate

Specific rotation

Dichroic glass

Step-growth polymerization

Optical Rotation

Isophorone

Toluene diisocyanate

10.1002/apmc.1995.052310104

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Citations (3)

Tunable Artificial Iris Controlled by Photo/Thermal Exposure Based on Liquid Crystalline Elastomers

Macromolecular Materials and Engineering (2021)

Kai Chang Chun‐Yen Liu Jui‐Hsiang Liu

Abstract The iris, part of the eye structure, is an important tissue in organisms. Here, a tunable artificial iris showing widening and closing of the pupil in response to near‐infrared (NIR) light is demonstrated. Liquid crystalline elastomers (LCEs) are synthesized via Michael addition and photopolymerization. To prepare an artificial iris, a predesigned stainless steel mold with a specific structure is created for the preparation of a single shaped LCE piece. Through the assembly of individual shaped LCE pieces, an artificial iris is fabricated. To enhance the photosensitivity, polydopamine (PDA) is coated on the surface of the fabricated iris. The PDA‐coated artificial iris shows reversible pupil widening and closing via exposure to NIR light. The dependence of pupil size on NIR intensity shows a function similar to the human iris. As far as it is known, the fabricated artificial iris with 2D radial motion is the first example prepared from a liquid crystalline elastomer showing a tunable aperture size controlled by the surrounding light intensity. The synthesized artificial iris is expected to show potential for multiple applications in biomimicry and biomedical science.

IRIS (biosensor)

Light intensity

10.1002/mame.202100121

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Citations (10)

Multi-level optical switch of diffractive light from a BCT photonic crystal based on an azo component-doped HPDLC

Ming Shian Li Andy Y.‐G. Fuh Jui‐Hsiang Liu Shing Trong Wu

Component (thermodynamics)

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Synthesis of chiral polymers having camphanediol moieties and their applications on the optical resolution of some racemates

Journal of Applied Polymer Science (1995)

Jui‐Hsiang Liu Fu‐Ren Tsai Yuh‐Chung ‐C Lai

Abstract Optically active exo‐exo‐2,3‐camphanediol (CPO) (3) was synthesized from (+)‐camphor. Chiral polymers poly(CPO‐ co ‐TDI) ( 6 ) and poly(CPO‐ co ‐IPDI) ( 7 ) were synthesized by the step polymerization of chiral compound CPO ( 3 ) with toluene‐2,4‐diisocyanate (TDI) and isophorone diisocyanate (IPDI). To investigate the stereo structure of the chiral polymers, two kinds of model compounds, exo‐exo‐2,3‐di[(phenylamido)oxy]camphane ( 4 ) and exo‐exo‐2,3‐di[(propylamido)oxy]camphane ( 5 ), related to polymers ( 6 ) and ( 7 ) were synthesized. Chiroptical characteristics and stereo structures of the chiral polymers were investigated using a circular dichroic spectrometer. The results obtained in this investigation suggest that the chiral polymers ( 6 ) and ( 7 ) have no one‐handed helix conformation. The optical resolution ability as chiral adsorbent for HPLC of the chiral polymers was investigated. It was found that chiral polymers ( 6 ) and ( 7 ) are effective for the optical resolution of some racemates. © 1995 John Wiley & Sons, Inc.

Isophorone diisocyanate

Dichroic glass

Chiral resolution

Step-growth polymerization

10.1002/app.1995.070581008

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Citations (3)

Synthesis of chiral polymers containing dimethylaminobornanol moieties

Die Angewandte Makromolekulare Chemie (1988)

Jui‐Hsiang Liu

Abstract In order to investigate the influence of spacer on the stereoselectivity of the addition of n‐butyllithium to aldehydes, three kinds of chiral polymers containing dimethylaminobornanol moieties were synthesized. The polymerization of the chiral monomers was carried out under various conditions. Cross‐linked chiral polymers were prepared by copolymerization of the chiral monomers with commercial p‐divinyl benzene. The conversion was found to be affected by the kind of solvents. Asymmetric addition of n‐butyllithium to benzaldehyde was carried out in the presence of the chiral polymers having dimethylaminobornanol moieties, and it was found that all three kinds of chiral polymers are effective for the asymmetric addition. Advantages of insoluble chiral polymers such as the ease of separation from products and the ability to be recycled, are discussed.

Butyllithium

Benzaldehyde

Chiral auxiliary

10.1002/apmc.1988.051640103

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Citations (4)