Dielectric Behavior of Side Chain Liquid Crystal Polymers: A Study by the Thermally Stimulated Current (TSC) Method

Faubert, François; Gilli, J. M.; Sixou, P.; Dandurand, Jany; Lacabanne, C.

doi:10.1080/00268949008042714

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…This attribution is in agreement with the interpretation of the results presented in ref. 4) and is reinforced by our previous work on TSDC of LCPS'~~~'). Moreover, Fig.…”

Section: Lo3 T-'/k"supporting

confidence: 65%

Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

Mano¹,

Correia²,

Ramos³

et al. 1995

Macro Chemistry & Physics

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SUMMARYIn the present work we report the results of a Thermally Stimulated Discharge Currents (TSDC) study of a side-chain liquid-crystalline polymer. The different discharges observed in the TSDC spectrum have been analysed by the thermal sampling technique and have been attributed to specific relaxation mechanisms at the molecular level. A particular feature of the polymer studied in this work is that the mesogenic side group presents both longitudinal and transverse components of the dipole moment, and this seems to be at the origin of the presence of two separated relaxations in the liquid-crystalline phase.

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“…This attribution is in agreement with the interpretation of the results presented in ref. 4) and is reinforced by our previous work on TSDC of LCPS'~~~'). Moreover, Fig.…”

Section: Lo3 T-'/k"supporting

confidence: 65%

Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

Mano¹,

Correia²,

Ramos³

et al. 1995

Macro Chemistry & Physics

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“…This is possibly the reason why the dielectrically measured a relaxation spectra of SCLCP with long alkyl spacer lengths are very broad. [5][6][7][8][9][10][11][12] Hence the coupling parameter n (and also the parameter v in the FHC model) can no longer be determined from the width or shape of the relaxation spectrum of a SCLCP with long alkyl spacer length. Thus, even though we expect the coupling parameter of a SCLCP with long spacer length to be smaller than that of another having short spacer length, this expectation cannot be verified by comparing their segmental relaxation spectrum.…”

Section: -Tanmentioning

confidence: 99%

“…Side-chain liquid crystalline polymers (SCLCP) have been the subject of research in recent years. [4][5][6][7][8][9][10][11][12] The * Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Spectroscopy of Side-Chain Liquid Crystalline Polymers in the Glass Transition Range

Étienne¹,

David²,

Mitov³

et al. 1995

Macromolecules

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The literature concerning the dielectric properties of polymeric liquid crystals is vast. [1][2][3][4] And yet, the relationships between intrinsic dielectric properties and physical state for DLCs remain obscure. Discotic liquid crystals (DLCs) are good models for the study of self-organising systems.…”

Section: Introductionmentioning

confidence: 99%

HRTEM, TSC and broadband dielectric spectroscopy of a discotic liquid crystal

Dantras

Dandurand

Lacabanne

et al. 2004

Phys. Chem. Chem. Phys.

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Due to its molecular configuration, Pyrene 1,3,6,8-tetracarboxylic rac-2-ethyl hexyl ester exhibits a mesomorphic phase at room temperature. High resolution transmission electron microscopy (HRTEM) of samples with various thermal history yield important results on discotic liquid crystal nanostructure. The evolution of the molecular organisation with the temperature has been determined by differential scanning calorimetry (DSC). The physical structure of this columnar liquid crystal is shown by dynamic dielectric spectroscopy (DDS) along a broad temperature and frequency range. As this liquid crystal is used as film electronic devices, the thermostimulated micro-technique (m-TSC) has been improved and developed. The behavior and molecular mobility in this columnar liquid crystal are studied. The correlation with thermal studies allows us to understand dielectric properties as a function of physical state.

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Dielectric Behavior of Side Chain Liquid Crystal Polymers: A Study by the Thermally Stimulated Current (TSC) Method

Cited by 12 publications

References 17 publications

Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

Molecular motions in a side‐chain liquid‐crystalline polymethacrylate. A thermally stimulated currents study of the dipolar relaxations in the vitreous and liquid‐crystalline phases and at the glass transition

Mechanical Spectroscopy of Side-Chain Liquid Crystalline Polymers in the Glass Transition Range

HRTEM, TSC and broadband dielectric spectroscopy of a discotic liquid crystal

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