Synthesis of Conductive Nanocomposites by Selective In Situ Polymerization of Pyrrole within the Lamellar Microdomains of a Block Copolymer

Electrically conductive nanocomposites were prepared by a selective in situ polymerization of pyrrole within the lamellae ionomeric microdomains of sulfonated poly(styrene-b-(ethylene-alt-propylene)), SEP, diblock copolymers. A conductivity of 10-3−10-1 S/cm was achieved parallel to the film surface...

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Bibliographic Details
Published in:Macromolecules 1998-04, Vol.31 (7), p.2230-2235
Main Authors: de Jesus, M. C, Weiss, R. A, Hahn, S. F
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Electrically conductive nanocomposites were prepared by a selective in situ polymerization of pyrrole within the lamellae ionomeric microdomains of sulfonated poly(styrene-b-(ethylene-alt-propylene)), SEP, diblock copolymers. A conductivity of 10-3−10-1 S/cm was achieved parallel to the film surface for PPy concentrations from 5 to 11 wt % PPy. Although the microstructure of the block copolymer was not purposefully aligned, the conductivity was anisotropic, varying 1−2 orders of magnitude parallel and normal to the plane of the composite films. The in situ polymerization of pyrrole in the SPS microphase did not disrupt the texture of the block copolymer microstructure, though the interphase between the polystyrene and rubber lamellae became more diffuse. Incorporation of PPy also improved the modulus of the block copolymer above the T g of the ionomer microdomains.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma971678a