Synthesis and thermal properties of liquid‐crystalline polyacrylates containing a carbazolyl group in the mesogen

Kosakasup, Yozo; Kato, Takashi; Uryu, Toshiyuki

doi:10.1002/pola.1994.080320409

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…The hole mobilities of the side-chain LC polymers have been on the order of 10 -5 ~ 10 -6 cm 2 /Vs which is comparable to those of amorphous polymers. [18][19][20][21][22][23] We synthesized side-chain LC polymers 2a-c whose backbone was flexible polysiloxane. The side-chain moieties were terthiophene which had good hole transport property.…”

Section: Side-chain Lc Polymers With High Hole Mobilitymentioning

confidence: 99%

Design of liquid-crystalline electronic functional materials through nanosegregation

Funahashi

2012

SPIE Proceedings

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Conventional liquid-crystalline (LC) semiconductors have been molecules consisting of a π-conjugated moiety and alkyl chains. For example, phenylterthiophene derivatives bearing alkyl chains exhibit ordered smectic phase at room temperature and are applied to field-effect transistors. In this paper, we report a molecular designs of LC electronic materials based on nanosegregation. Terthiophene derivatives bearing an imdazolium moiety exhibit supremolecular smectic phases, in which hole-and ion-conductive layers are formed separately. In the LC phase, electrochrmism is observed under the application of a DC bias without any electrolyte solutions. In simple side-chain LC polysiloxanes bearing terthiophene pendant groups, suprastructures based on nanosegregation are observed. The presence of flexible sublayers consisting of the polysiloxane backbones can relax the applied strain and decrease defect density, resulting in high hole mobility on the order of 10 -2 cm 2 /Vs. For perylene tetracarboxylic bisimide (PTCBI) derivatives bearing oligosiloxane chains, nanosegregation between the rigid aromatic cores and flexible oligosiloxane chains promotes the formation of columnar and layer structures, in which efficient electron transport is observed. The electron mobility in the columnar phase of the PTCBI derivative bearing four trisiloxane chains exceeds 10 -3 cm 2 /Vs at room temperature.

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Section: Side-chain Lc Polymers With High Hole Mobilitymentioning

confidence: 99%

Design of liquid-crystalline electronic functional materials through nanosegregation

Funahashi

2012

SPIE Proceedings

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“…According to ref. 40, it does not need to consider the differences of the molecular weights of the copolymers to discuss the thermal properties of the copolymers.…”

Section: Copolymerization Of Photochromic Monomers and Cholesteryl Momentioning

confidence: 99%

Synthesis and properties of photochromic liquid-crystalline copolymers containing both spironaphthoxazine and cholesteryl groups

Hattori

Uryu

2000

J. Polym. Sci. A Polym. Chem.

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High Hole Mobility for a Side‐Chain Liquid‐Crystalline Smectic Polysiloxane Exhibiting a Nanosegregated Structure with a Terthiophene Moiety

Matsui

Funahashi

Tsuji

et al. 2010

Chemistry A European J

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Side-chain liquid-crystalline siloxane polymers bearing terthiophene moieties as mesogenic pendant groups have been synthesized. An alkenylterthiophene derivative was treated with poly(hydrogenmethylsiloxane) and poly(dimethylsiloxane-co-hydrogenmethylsiloxane)s in Me(2)SiO/MeHSiO ratios of 1:1 and 7:3, respectively, in the presence of the Karstedt catalyst, to produce pale yellow polymers. The degrees of introduction of the mesogenic unit were 100, 50, and 30%, respectively. The polymers exhibit ordered smectic phases at room temperature. The copolymers with dimethylsiloxane units form smectic phases as a consequence of nanosegregation between the mesogenic units and siloxane backbones with the alkylene spacers. Time-of-flight measurement reveals that the hole mobility exceeds 1×10(-2) cm(2) V(-1) s(-1) in the ordered smectic phase of the copolymer with a degree introduction of the mesogenic units of 50%. This value is comparable to that of the highly ordered mesophases of low-molecular-weight derivatives of phenylnaphthalene and terthiophene. Because of the segregation behavior induced by the flexible backbone, a closer molecular packing structure favorable for fast carrier transport may be formed in the smectic phase of the copolymer in spite of the low density of the mesogenic groups.

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Synthesis and thermal properties of liquid‐crystalline polyacrylates containing a carbazolyl group in the mesogen

Cited by 9 publications

References 21 publications

Design of liquid-crystalline electronic functional materials through nanosegregation

Design of liquid-crystalline electronic functional materials through nanosegregation

Synthesis and properties of photochromic liquid-crystalline copolymers containing both spironaphthoxazine and cholesteryl groups

High Hole Mobility for a Side‐Chain Liquid‐Crystalline Smectic Polysiloxane Exhibiting a Nanosegregated Structure with a Terthiophene Moiety

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