Synthesis and characterization of polythiophenes with liquid crystalline azobenzene as side chains

Xiongyan Zhao; Xiao Hu; P. J. Zheng; L. H. Gan; Choon Keat Paul Lee

doi:10.1016/j.tsf.2004.08.181

Synthesis and characterization of polythiophenes with liquid crystalline azobenzene as side chains

Xiongyan Zhao, Xiao Hu, P. J. Zheng, L. H. Gan, Choon Keat Paul Lee

Nanyang Technological University

Research output: Contribution to journal › Conference article › peer-review

14 Citations (Scopus)

Abstract

A series of azobenzene-functionalized liquid-crystalline (LC) polythiophene derivatives: poly[4-((4-(phenyl)azo)phenoxy)alkyl-3-thienylacetate] (alkyl=hexyl, octyl and undecyl) (P6EtO, P8EtO and P11EtO) were synthesized. The composition, structure and thermal property of these LC polythiophene derivatives were fully characterized, and their LC behavior and photoresponsive property were also investigated by means of POM and UV source. The results have shown that PnEtO exhibited the nematic (N) phase when the azobenzene moiety was in the trans form while no LC phase was observed when the azobenzene was in the cis form. Photoirradiation of these polymers with UV light brings about the trans-cis isomerization of the azobenzene pendants and results in disappearance of the nematic phase.

Original language	English
Pages (from-to)	88-94
Number of pages	7
Journal	Thin Solid Films
Volume	477
Issue number	1-2
DOIs	https://doi.org/10.1016/j.tsf.2004.08.181
Publication status	Published - Apr 22 2005
Externally published	Yes
Event	ICMAT 03 - Duration: Dec 7 2003 → Dec 12 2003

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

Keywords

Azobenzene
Nematic-isotropic phase transition
Polythiophene derivatives
trans-cis isomerization

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10.1016/j.tsf.2004.08.181

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title = "Synthesis and characterization of polythiophenes with liquid crystalline azobenzene as side chains",

abstract = "A series of azobenzene-functionalized liquid-crystalline (LC) polythiophene derivatives: poly[4-((4-(phenyl)azo)phenoxy)alkyl-3-thienylacetate] (alkyl=hexyl, octyl and undecyl) (P6EtO, P8EtO and P11EtO) were synthesized. The composition, structure and thermal property of these LC polythiophene derivatives were fully characterized, and their LC behavior and photoresponsive property were also investigated by means of POM and UV source. The results have shown that PnEtO exhibited the nematic (N) phase when the azobenzene moiety was in the trans form while no LC phase was observed when the azobenzene was in the cis form. Photoirradiation of these polymers with UV light brings about the trans-cis isomerization of the azobenzene pendants and results in disappearance of the nematic phase.",

keywords = "Azobenzene, Nematic-isotropic phase transition, Polythiophene derivatives, trans-cis isomerization",

author = "Xiongyan Zhao and Xiao Hu and Zheng, {P. J.} and Gan, {L. H.} and Lee, {Choon Keat Paul}",

year = "2005",

month = apr,

day = "22",

doi = "10.1016/j.tsf.2004.08.181",

language = "English",

volume = "477",

pages = "88--94",

journal = "Thin Solid Films",

issn = "0040-6090",

publisher = "Elsevier",

number = "1-2",

note = "ICMAT 03 ; Conference date: 07-12-2003 Through 12-12-2003",

}

TY - JOUR

T1 - Synthesis and characterization of polythiophenes with liquid crystalline azobenzene as side chains

AU - Zhao, Xiongyan

AU - Hu, Xiao

AU - Zheng, P. J.

AU - Gan, L. H.

AU - Lee, Choon Keat Paul

PY - 2005/4/22

Y1 - 2005/4/22

N2 - A series of azobenzene-functionalized liquid-crystalline (LC) polythiophene derivatives: poly[4-((4-(phenyl)azo)phenoxy)alkyl-3-thienylacetate] (alkyl=hexyl, octyl and undecyl) (P6EtO, P8EtO and P11EtO) were synthesized. The composition, structure and thermal property of these LC polythiophene derivatives were fully characterized, and their LC behavior and photoresponsive property were also investigated by means of POM and UV source. The results have shown that PnEtO exhibited the nematic (N) phase when the azobenzene moiety was in the trans form while no LC phase was observed when the azobenzene was in the cis form. Photoirradiation of these polymers with UV light brings about the trans-cis isomerization of the azobenzene pendants and results in disappearance of the nematic phase.

AB - A series of azobenzene-functionalized liquid-crystalline (LC) polythiophene derivatives: poly[4-((4-(phenyl)azo)phenoxy)alkyl-3-thienylacetate] (alkyl=hexyl, octyl and undecyl) (P6EtO, P8EtO and P11EtO) were synthesized. The composition, structure and thermal property of these LC polythiophene derivatives were fully characterized, and their LC behavior and photoresponsive property were also investigated by means of POM and UV source. The results have shown that PnEtO exhibited the nematic (N) phase when the azobenzene moiety was in the trans form while no LC phase was observed when the azobenzene was in the cis form. Photoirradiation of these polymers with UV light brings about the trans-cis isomerization of the azobenzene pendants and results in disappearance of the nematic phase.

KW - Azobenzene

KW - Nematic-isotropic phase transition

KW - Polythiophene derivatives

KW - trans-cis isomerization

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U2 - 10.1016/j.tsf.2004.08.181

DO - 10.1016/j.tsf.2004.08.181

M3 - Conference article

AN - SCOPUS:14544296103

SN - 0040-6090

VL - 477

SP - 88

EP - 94

JO - Thin Solid Films

JF - Thin Solid Films

IS - 1-2

T2 - ICMAT 03

Y2 - 7 December 2003 through 12 December 2003

ER -

Synthesis and characterization of polythiophenes with liquid crystalline azobenzene as side chains

Abstract

ASJC Scopus Subject Areas

Keywords

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