Anisotropic conductivity on diblock copolymers with lamellar microdomains

Ishizu, Koji; Yamada, Yoshikuni; Saito, Reiko; Kanbara, Takaki; Yamamoto, Takakazu

doi:10.1016/0032-3861(93)90805-k

Cited by 18 publications

(9 citation statements)

References 11 publications

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“…Ishizuetal. (117,118) synthesized poly(styrene-b-2-vinylpyridine) diblock copolymers with alternating lamellae stacked parallel to the polymer-air surface. Exposure of the block copolymer to alkyl halide vapors produced semiconductive materials in which the conductivity varied by approximately six orders of magnitude parallel and perpendicular to the plane of the lamellar stack.…”

Section: Conductive Blends Involving Block Copolymersmentioning

confidence: 99%

Conductive polymer blends prepared by in situ polymerization of pyrrole: A review

Jesus¹,

Fu²,

Weiß³

1997

Polymer Engineering & Sci

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Section: Conductive Blends Involving Block Copolymersmentioning

confidence: 99%

Conductive polymer blends prepared by in situ polymerization of pyrrole: A review

Jesus¹,

Fu²,

Weiß³

1997

Polymer Engineering & Sci

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“…[1][2][3][4][5] Such clusters are expected to have interesting electrical and optical properties. 6,7 Isnanoclusters were characterized by transmission electron microscopy (TEM), small-angle X-ray hizu et al 8 studied the conductivity of a poly-(styrene-b-2-vinylpyridine) block copolymer which scattering (SAXS), and wide-angle X-ray diffraction (WAXD). The dielectric properties and anisoformed horizontally oriented lamellar microdomains containing colloidal silver.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of block copolymers containing silver nanoclusters within oriented lamellar microdomains

Sohn

Cohen

1997

J. Appl. Polym. Sci.

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Films containing silver nanoclusters within a lamellar morphology were obtained via postprocessing reduction of the silver-containing regions of block copolymers synthesized by ring opening metathesis polymerization. Solution-cast films (0.1 mm thickness) of the block copolymer exhibited an oriented lamellar morphology with lamellar normals perpendicular to the film plane. The slightly anisotropic dielectric properties, perpendicular and parallel to the film plane, were investigated by direct measurement and by model calculations. The conductivity was highly anisotropic, differing by at least four orders of magnitude in directions parallel and perpendicular to the film plane.

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“…In a previous work, 6 we have found that the SV2 film, cast from a TCE solution on a Teflon substrate, showed the microdomain structure of horizontally oriented lamellae. The TCE seems to work poorly for the P2VP component.…”

Section: Experimental Polymer Characterization and Morphologymentioning

confidence: 98%

“…5 The quaternized PBVP domains exhibited the nature of ionic conduction. This film had a n anisotropic conductivity with about 8 orders of magnitude (conductivity parallel to the film plane ull = and conductivity perpendicular to the film plane a l = s/cm) .…”

Section: Introductionmentioning

confidence: 99%

Conducting diblock copolymers with lonic complex/insulator lamellar microdomains

Ishizu

Yamada

Saito

1993

J of Applied Polymer Sci

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SYNOPSISPoly ( styrene-b-2-vinylpyridine) diblock copolymer films with horizontally oriented lamellar microdomains were obtained by the casting method. Poly (2-vinylpyridine) (P2VP) microdomains were not only quaternized, but were also crosslinked with 1,4-diiodobutane vapor. Subsequently, ionic complex phases were constructed by an ion-exchange reaction of quaternized PPVP phases with lithium perchlorate. The element (chlorine and iodine atoms) distributions on the vertical section of the modified films were measured by means of an energy dispersive X-ray spectrometer. These materials had highly anisotropic conductivity with approximately 6 orders of magnitude. INTRODUCTIONThere have been reports of attempts to measure the electrical conductivity of diblock copolymers in which one of the blocks consisted of poly (2-vinylpyridine ) ( P2VP ) .1-3 However, these materials have never shown electrical anisotropy with conductivities, because the orientation of microphase-separated structures, formed by block copolymers, was not controlled.We have subsequently shown t h a t poly-polymer formed horizontally oriented lamellar microdomains, by means of the air-copolymer and the substrate-copolymer interaction^.^ Following this, semiconducting materials were obtained upon the exposure of film with alkyl dihalide vapor.5 The quaternized PBVP domains exhibited the nature of ionic conduction. This film had a n anisotropic conductivity with about 8 orders of magnitude (conductivity parallel to the film plane ull = and conductivity perpendicular to the film plane a l = s/cm) . Colloidal silver was also introduced into quaternized P2VP layers by reduction of silver iodine.6 This film showed the 100-fold ull value, as compared with that observed in diblock copolymer films with the quaternized P2VP layers. According to our results, high electrical anisotropy originates in the orientation of microphase-separated structures. Thus, it is important that the morphological structure of diblock copolymer films is not disturbed during the modification process. In this article, the ionic complex was introduced into the quaternized P2VP layers by an ion-exchange reaction with lithium perchlorate ( LiC104) in various reaction conditions. The element (chlorine and iodine) distributions, on the vertical section of the modified films, were measured by means of an energy dispersive X-ray spectrometer (EDX) .We studied the anisotropic conductivity of these materials.

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Anisotropic conductivity on diblock copolymers with lamellar microdomains

Cited by 18 publications

References 11 publications

Conductive polymer blends prepared by in situ polymerization of pyrrole: A review

Conductive polymer blends prepared by in situ polymerization of pyrrole: A review

Electrical properties of block copolymers containing silver nanoclusters within oriented lamellar microdomains

Conducting diblock copolymers with lonic complex/insulator lamellar microdomains

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