Guey‐Sheng Liou

National Taiwan University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Hung‐Ju Yen

Institute of Chemistry, Academia Sinica

Sheng‐Huei Hsiao

National Taipei University of Technology

Chia-Liang Tsai

National Taiwan University

Wen‐Chang Chen

National Taiwan University

Chin‐Ping Yang

National Chung Cheng University

Cha‐Wen Chang

Industrial Technology Research Institute

Chih‐Jung Chen

Taoyuan Chang Gung Memorial Hospital

Jiahao Wu

Tianjin University

Masa‐aki Kakimoto

National Institute for Materials Science

Yu‐Jen Shao

National Taiwan University

Cooperative Institutions

National Taiwan University

109

National Taiwan University of Science and Technology

Tatung University

National Chi Nan University

National Yang Ming Chiao Tung University

National Taipei University of Technology

National Chung Hsing University

National Cheng Kung University

Industrial Technology Research Institute

National Tsing Hua University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Synthesis, Photophysical, and Electrochromic Characterization of Wholly Aromatic Polyamide Blue-Light-Emitting Materials

Macromolecules (2006)

Guey‐Sheng Liou Sheng‐Huei Hsiao Nan‐Kun Huang Yi‐Lung Yang

A new carbazole-derived triphenylamine-containing aromatic dicarboxylic acid monomer, 4,4'-dicarboxy-4' '-N-carbazolyltriphenylamine, with blue light (460 nm) fluorescence quantum yield of 40% was successfully synthesized by the cesium-fluoride-mediated condensation of N-(4-aminophenyl)carbazole with 4-fluorobenzonitrile, followed by alkaline hydrolysis of the dinitrile intermediate. A series of novel poly(amine-amide)s with pendent N-phenylcarbazole units having inherent viscosities of 0.36−0.61 dL/g were prepared from the newly synthesized dicarboxylic acid monomer and various aromatic diamines by direct phosphorylation polycondensation. The obtained polymers were amorphous and could afford flexible, transparent, and tough films with good mechanical properties. They had useful levels of thermal stability associated with relatively high glass-transition temperatures (269−322 °C). These polymers exhibited strong UV−vis absorption maxima at 340−361 nm, and their photoluminescence showed emission peaks around 449−465 nm with quantum yields up to 46% in NMP solution. The hole-transporting and electrochromic properties were examined by electrochemical and spectroelectrochemical methods. Cyclic voltammograms of the poly(amine-amide) films prepared by casting polymer solution onto an indium−tin oxide (ITO)-coated glass substrate exhibited one reversible oxidative redox couples at potentials of 1.11−1.18 V vs Ag/AgCl in acetonitrile solution due to oxidation of main-chain triphenylamine unit. The polymer films revealed excellent stability of electrochromic characteristics for the radical cations generated, changing color from original yellowish to deep blue.

Triphenylamine

Carbazole

Quantum yield

Thermal Stability

Inherent viscosity

10.1021/ma0608469

Cite

Citations (125)

Solution-Processable Novel Near-Infrared Electrochromic Aromatic Polyamides Based on Electroactive Tetraphenyl-p-Phenylenediamine Moieties

Chemistry of Materials (2009)

Hung‐Ju Yen Guey‐Sheng Liou

A series of solution-processable near-infrared (NIR) electrochromic aromatic polyamides with N,N,N′,N′-tetraphenyl-p-phenylenediamine (TPPA) units in the backbone were prepared from the phosphorylation polyamidation reactions of a newly synthesized diamine monomer, N,N′-bis(4-aminophenyl)-N,N′-di(4-methoxylphenyl)-1,4-phenylenediamine, with various aromatic dicarboxylic acids. These polymers were readily soluble in many organic solvents and showed useful levels of thermal stability associated with high glass-transition temperatures (236−246 °C) and high char yields (higher than 58% at 800 °C in nitrogen). The polymer films showed reversible electrochemical oxidation with high contrast ratio both in the visible range and NIR region, which also exhibited high coloration efficiency (CE), low switching time, and the highest stability for long-term electrochromic operation to date. At the first oxidation stage, the polyamide Ib thin film revealed high coloration efficiency in visible (CE = 388 cm2/C) and NIR (CE = 330 cm2/C) region with reversible electroactive stability (over 10000 times within 0.4% loss relative to its initial injected charge). As the dication form of second oxidation stage, the polymer film still exhibited excellent electrochromic/electroactive stability (more than 3000 cyclic switches) with higher CE of 464 cm2/C.

Thermal Stability

Electrochromic devices

Triphenylamine

Dication

10.1021/cm9015222

Cite

Citations (129)

Synthesis and properties of new poly(amide-imide)s based on 2,5-bis(trimellitimido)chlorobenzene

Journal of Applied Polymer Science (1999)

Chin‐Ping Yang Guey‐Sheng Liou Chuncheng Yang Kaug-Ju Chen

A series of new aromatic poly(amide-imide)s were synthesized by the triphenyl phosphite-activated polycondensation of the diimide-diacid, 2,5-bis(trimellitimido)chlorobenzene (I) with various aromatic diamines in a medium consisting of N-methyl-2-pyrrolidone (NMP), pyridine, and calcium chloride. The poly(amide-imide)s had inherent viscosities of 0.76–1.42 dL g−1. The diimide-diacid monomer (I) was prepared from 2-chloro-p-phenylenediamine with trimellitic anhydride. Most of the resulting polymers showed an amorphous nature and were readily soluble in a variety of organic solvents, including NMP and N,N-dimethylacetamide. Transparent, flexible, and tough films of these polymers could be cast from N,N-dimethylacetamide or NMP solutions. Their cast films had tensile strengths ranging from 74 to 95 MPa, elongations at break from 7 to 11%, and initial moduli from 1.38 to 3.25 GPa. The glass transition temperatures of these polymers were in the range of 233°–260°C, and the 10% weight loss temperatures were above 450°C in nitrogen. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1691–1701, 1999

Imide

Chlorobenzene

Triphenyl phosphite

Diimide

Inherent viscosity

Amide

Dimethylacetamide

Terephthaloyl chloride

10.1002/(sici)1097-4628(19990307)71:10<1691::aid-app16>3.0.co;2-h

Cite

Citations (7)

Synthesis and Electrochromism of Highly Organosoluble Polyamides and Polyimides with Bulky Trityl-Substituted Triphenylamine Units

Polymers (2017)

Sheng‐Huei Hsiao Wei-Kai Liao Guey‐Sheng Liou

Two series of polyamides and polyimides containing bulky trityl-substituted triphenylamine units were synthesized from condensation reactions of 4,4'-diamino-4''-trityltriphenylamine with various dicarboxylic acids and tetracarboxylic dianhydrides, respectively. The polymers showed good solubility and film-forming ability. Flexible or robust films could be readily obtained via solution-casting. The use of aliphatic diacid or dianhydride reduces interchain charge transfer complexing and leads to colorless polyamide and polyimide films. These polymers showed glass-transition temperatures in the range of 206⁻336 °C. Cyclic voltammograms of the polyamide and polyimide films displayed reversible electrochemical oxidation processes in the range of 0⁻1.0 or 0⁻1.3 V. Upon oxidation, the color of polymer films changes from colorless to blue-green or blue. As compared to the polyimide counterparts, the polyamides showed lower oxidation potentials and thus a higher electrochromic stability and coloration efficiency. Simple electrochromic devices were also fabricated as a preliminary investigation for electrochromic applications of the prepared polymers.

Triphenylamine

Electrochromic devices

Polyfluorene

10.3390/polym9100511

Cite

Citations (35)

A novel panchromatic shutter based on an ambipolar electrochromic system without supporting electrolyte

Chemical Communications (2018)

Jung-Tsu Wu Guey‐Sheng Liou

Two triphenylamine derivatives, N,N,N',N'-tetrakis(4-methoxyphenyl)-1,4-phenylenediamine TPPA and N,N,N',N'-tetrakis(4-methoxyphenyl)-1,1'-biphenyl-4,4'-diamine TPB, were successfully prepared and combined with HV to fabricate the electrochromic device as a panchromatic shutter for the application of transparent display. The obtained electrochromic device exhibits exceptional novel electrochromic properties, including enhanced color contrast, switching time, and long-term stability. Furthermore, it is worth mentioning that the most important contribution of this ambipolar system approach is that no supporting electrolyte is added into the device.

Ambipolar diffusion

Panchromatic film

10.1039/c8cc00224j

Cite

Citations (41)

Synthesis and properties of new soluble triphenylamine‐based aromatic poly(amine amide)s derived from N,N′‐bis(4‐carboxyphenyl)‐N,N′‐diphenyl‐1,4‐phenylenediamine

Journal of Polymer Science Part A Polymer Chemistry (2002)

Guey‐Sheng Liou Sheng‐Huei Hsiao

Abstract A new triphenylamine‐containing aromatic dicarboxylic acid, N,N ′‐bis(4‐carboxyphenyl)‐ N,N ′‐diphenyl‐1,4‐phenylenediamine, was synthesized by the condensation of N,N ′‐diphenyl‐1,4‐phenylenediamine with 4‐fluorobenzonitrile, followed by the alkaline hydrolysis of the intermediate dinitrile compound. A series of novel triphenylamine‐based aromatic poly(amine amide)s with inherent viscosities of 0.50–1.02 dL/g were prepared from the diacid and various aromatic diamines by direct phosphorylation polycondensation. All the poly(amine amide)s were amorphous in nature, as evidenced by X‐ray diffractograms. Most of the poly(amine amide)s were quite soluble in a variety of organic solvents and could be solution‐cast into transparent, tough, and flexible films with good mechanical properties. They had useful levels of thermal stability associated with glass‐transition temperatures up to 280 °C, 10% weight‐loss temperatures in excess of 575 °C, and char yields at 800 °C in nitrogen higher than 60%. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 94–105, 2003

Triphenylamine

Amide

Thermal Stability

10.1002/pola.10552

Cite

Citations (50)

Electrochromic Response Capability Enhancement with Pentiptycene‐Incorporated Intrinsic Porous Polyamide Films

Macromolecular Rapid Communications (2020)

Ya‐Wen Chiu Wei Tan Jye‐Shane Yang Min‐Hao Pai Guey‐Sheng Liou

Abstract Enhancing switching response capability of electrochromic (EC) polymers has been a topical issue. Herein, the H‐shaped nonplanar pentiptycene scaffold is successfully introduced into the polyamide film derived from N , N ′‐bis(4‐aminophenyl)‐ N , N ′‐di(methoxyphenyl)‐1,4‐phenylenediamine (TPPA), and the resulting copolymer shows enhanced EC behaviors, including lower oxidation potential and shorter switching response time, as compared to the corresponding TPPA‐derived homopolymer.

Smart polymer

Electrochromic devices

10.1002/marc.202000186

Cite

Citations (10)

Synthesis and properties of new aromatic polyamides with redox-active 2,4-dimethoxytriphenylamine moieties Part A Polymer chemistry

Journal of Polymer Science (2010)

Sheng‐Huei Hsiao Guey‐Sheng Liou Yi‐Chun Kung Tzu‐Jung Hsiung

A new triphenylamine-based diamine monomer, 4,4′-diamino-2″,4″-dimethoxytriphenylamine (2), was synthesized from readily available reagents and was reacted with various aromatic dicarboxylic acids to produce a series of aromatic polyamides (4a-h) containing the redox-active 2,4-dimethoxy-substituted triphenylamine (dimethoxyTPA) unit. All the resulting polyamides were readily soluble in polar organic solvents and could be solution cast into tough and flexible films. These polymers exhibited good thermal stability with glass transition temperatures of 243-289 °C and softening temperatures of 238-280 °C, 10% weight loss temperatures in excess of 470 °C in nitrogen, and char yields higher than 60% at 800 °C in nitrogen. The redox behaviors of the polymers were examined using cyclic voltammetry (CV). All these polyamides showed two reversible oxidation processes in the first CV scan. The polymers also displayed low ionization potentials as a result of their dimethoxyTPA moieties. In addition, the polymers displayed excellent stability of electrochromic characteristics with coloration change from a colorless neutral state to green and blue-purple oxidized states. These anodically coloring polyamides showed high green coloration efficiency (CE = 329 cm²/C), high contrast of optical transmittance change (ΔT% = 84% at 829 nm), and long-term redox reversibility.

Triphenylamine

Thermal Stability

Diphenylmethane

Source

Cite

Citations (0)

A novel class of organosoluble and light-colored fluorinated polyamides derived from 2,2 0 -bis(4-amino-2-trifluoromethylphenoxy)biphenyl or 2,2 0 -bis(4-amino-2-trifluoromethylphenoxy)-1,1 0 -binaphthyl

Sheng‐Huei Hsiao Chin‐Ping Yang Che‐Yu Tsai Guey‐Sheng Liou

Two series of novel fluorinated aromatic polyamides were prepared from 2,2 0 -bis(4-amino-2-trifluoromethylphenoxy)biphenyl (2) and 2,2 0 -bis(4-amino-2-trifluoromethylphenoxy)-1,1 0 -binaphthyl (4) with various aromatic dicarboxylic acids using the phosphorylation polycondensation technique. The polyamides had inherent viscosities ranging from 0.43 to 0.62 dl/g and 0.36 to 0.74 dl/g, respectively. All the fluorinated polyamides were soluble in many polar organic solvents such as N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone, and afforded transparent, light-colored, and flexible films upon casting from DMAc solvent. These polyamides showed glass-transition temperatures in the ranges of 190–240 C (for the 6 series from diamine 2) and 247–255 C (for the 7 series from diamine 4) by differential scanning calorimetry, softening temperatures in the ranges of 196–230 C( 6 series) and 241–291 C( 7 series) by thermomechanical analysis, and decomposition temperatures for 10% weight loss above 420 C in both nitrogen and air atmospheres.

Solvatochromism

Dimethylacetamide

Biphenyl

Source

Cite

Citations (0)

Tröger’s Base-Cored Triarylamine Polyamide for Electrochromic Response Capability Enhancement

ACS Applied Polymer Materials (2023)

Min-Hsiu Tu Yu‐Jen Shao Houlin Li Chien‐Chieh Hu Guey‐Sheng Liou

Recently, more and more researchers have focused on generating "pores" within the polymer matrix to prompt the performance of electrochromic (EC) films using physical or chemical approaches. In this work, we meticulously designed a Tröger's base (TB)-cored arylamine-containing diamine monomer, TBTPA-NH2, and synthesized the corresponding redox-active polyamide, PTBTPA. The resulting PTBTPA exhibits low density with large d-spacing and surface area, contributing to the rigid and V-shaped TB unit. Consequently, the prepared polymer film demonstrated remarkable electrochemical and EC behaviors, such as low applied potential (1.00 V), facilitating rapid diffusion of the electrolyte, reasonable switching capability (1.8 s/1.5 s for coloring tc and bleaching tb, respectively), and excellent stability. For further application, the electrochromic device (ECD) of PTBTPA/HV exhibits the best-enhanced response capability (3.5 s/6.1 s for tc and tb, respectively), the highest coloration efficiency (337 cm2/C), and switching stability (96.1% of retention after 500-cycle switching).

Base (topology)

10.1021/acsapm.3c02288

Cite

Citations (0)