Conductivity and superconductivity in polymers

Goodings, E. P.

doi:10.1039/cs9760500095

Cited by 124 publications

(23 citation statements)

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“…For the temperature interval 100 K < T t 3 0 0 K, almost isotropic mobility of the holes p,,z T -' . 5 is found: the mobility of the electrons is, however, strongly anisotropic ho z T -1.57 , hh z T -o.84 and k r z T + o -1 6 . The indices a, 6, c refer to the axes of the anthracene unit cell.…”

Section: Epstein and Conwell19'l A ( T ) / U ( T ) = A T -" E X P (mentioning

confidence: 88%

Polymers with Metal‐Like Conductivity—A Review of their Synthesis, Structure and Properties

Wegner

1981

Angew. Chem. Int. Ed. Engl.

362

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Polymers such as polyacetylene, which have an extended a-electron system in their backbone, or like poly(p-phenylene) consist of a sequence of aromatic rings are excellent insulators in their native state and can be transformed by oxidation or reduction in the solid state into conductive CT-complexes which exhibit metal-like conduction characteristics. The chemical and physical processes involved and the reasons for the observed quasimetallic conductivity are not yet fully understood. The real structure of these materials in chemical and physical terms, i . e. their complicated morphology and texture, as well as the results available on the structureproperty relationships of the "organic metals" must be considered when discussing their properties. In other words, a discussion of conductive polymers should be based on what is known of the highly conducting CT-complexes of low-molecular weight compounds. The discovery of the highly conducting polymer complexes has opened up a new interdisciplinary field of research which borders on polymer science, solid-state and semiconductor physics and on organic solid-state chemistry. It is hoped that this area will lead to numerous novel materials and technical applications.

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Section: Epstein and Conwell19'l A ( T ) / U ( T ) = A T -" E X P (mentioning

confidence: 88%

Polymers with Metal‐Like Conductivity—A Review of their Synthesis, Structure and Properties

Wegner

1981

Angew. Chem. Int. Ed. Engl.

362

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“…Organic compounds able to self-organize are of increasing interest because of their special physical properties such as electrical conductivity [ 1-33, superconductivity [4] or non-linear optical properties [S]. They may serve therefore, in many cases as substitutes for inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Discotic charge transfer twins Structure and mesophase behaviour of covalently linked triphenylenes and trinitrofluorenones

Möller¹,

Tsukruk²,

Wendorff³

et al. 1992

Liquid Crystals

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Discotic charge transfer twins, a novel class of discotic liquid-crystalline compounds were studied. These compounds consist of triphenylene units (as donors) which are chemically linked via flexible spacers of various lengths to trinitrofluorenone units (acting as acceptor). They display a liquid-crystalline phase over a wide temperature range extending up to 24G26O"C. Based on X-ray analysis a structural model is proposed for the liquid-crystalline phase: the molecules are arranged in columns in such a way that mixed stacks occur, the intercolumnar packing possesses an orthorhombic symmetry. The neighbouring columns are connected along specific directions via flexible spacers which give rise to highly anisotropic structural properties of this columnar liquid-crystalline phase.

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“…30 At 10 wt % content of the filler, the values of r decrease to some extent. This may be attributed to the formation of some nanoparticle agglomerates due to more intense interfacial interactions between nanoparticles upon further increasing the content of the filler, which may cause some steric hindrance that partially contributes to decreasing the electrical charge mobility.…”

mentioning

confidence: 93%

Studies of particle dispersion in plasticized poly(vinyl chloride)/montmorillonite nanocomposites

Saad

Dimitry

2011

J of Applied Polymer Sci

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Poly(vinyl chloride)(PVC) and dioctyl phthalate (DOP) were mixed with 5 and 10 wt % of Cloisite Na þ , Cloisite 30B or Cloisite 93A. The obtained nanocomposites were characterized by thermal analysis using a thermogravimetric analyzer which showed that addition of 5 wt % of nanoclay to PVC increased its thermal stability in the sequence: Cloisite Na þ < Cloisite 93A< Cloisite 30B. The electrical conductivity of these composites was studied as a function of temperatures and showed that the conductivity of PVC was enhanced upon using 5 wt % of nanoclay in the sequence: Cloisite Na þ < Cloisite 30B < Cloisite 93A. The activation energy of interaction of PVC with nanoclay was found to be lowest for the composite containing 5 wt % of nanoclay in the same sequence. The tensile strength, elongation (%), and Young's modulus were considerably enhanced upon increasing the clay content to 5 wt % in the sequence: Cloisite Na þ < Cloisite 93A < Cloisite 30B. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study these nanocomposite structures, and it was found that the organoclay layers are homogeneously dispersed in the PVC matrix when 5 wt % of Cloisite 30B or Cloisite 93A was used.

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Conductivity and superconductivity in polymers

Cited by 124 publications

References 0 publications

Polymers with Metal‐Like Conductivity—A Review of their Synthesis, Structure and Properties

Polymers with Metal‐Like Conductivity—A Review of their Synthesis, Structure and Properties

Discotic charge transfer twins Structure and mesophase behaviour of covalently linked triphenylenes and trinitrofluorenones

Studies of particle dispersion in plasticized poly(vinyl chloride)/montmorillonite nanocomposites

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