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Conductive, Polypyrrole Coating on Mullite/Alumina Fibers for Electrophoretic Deposition of Oxide Matrices
Author(s) -
Bao Yahua,
Nicholson Patrick S.
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01767.x
Subject(s) - polypyrrole , materials science , electrophoretic deposition , mullite , coating , composite material , thermogravimetric analysis , scanning electron microscope , fiber , microstructure , conductive polymer , conductivity , chemical engineering , polymer , ceramic , chemistry , polymerization , engineering
Mullite/alumina fibers (Nextel™ 720) have been rendered conductive for electrophoretic deposition (EPD) by coating with polypyrrole (Ppy) from an aqueous solution of pyrrole (Py). The polymer coating was characterized by thermogravimetric (TG) analysis, scanning electron microscopy (SEM), and conductivity measurements. The Ppy coating thickness is ∼0.1 μm and the fiber resistance 1–2 (kΩ/cm)/fiber tow. A maximum conductivity of ∼48 S/cm was achieved from a 0.005 M pyrrole solution. A Nextel 720/Al 2 O 3 composite was synthesized using Ppy‐coated fibers as the cathode in an EPD cell. The green and sintered microstructures of the resultant composites are reported.