Page 158 - Handbook of Adhesion Promoters

8.9 Polyaniline 151

8.9 POLYANILINE

Short glass fiber Type E was coated with electrically conducting polyaniline and melt
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compounded with polypropylene. Polypropylene grafted with maleic anhydride was
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investigated as an adhesion promoter for these composites. The wetting and dispersion of
the fibers were improved when the adhesion promoter was added (on the negative side this
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led to encapsulation and lowering the electrical conductivity of composite). The adhesion
promoter improved Young’s modulus of the composite as a result of a reaction between
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the maleic anhydride groups of the adhesion promoter and polyaniline. Figure 2.22 shows
that the polyaniline coating of glass fiber causes transcrystallization which may be the rea-
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son for excellent adhesion.
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Polyaniline emeraldine salt was added to an epoxy paint coating. This conducting
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polymer worked as both corrosion inhibitor and adhesion promoter.
REFERENCES
1 Cruz-Silva, R; Romero-Garcia, J; Vazquez-Rodriguez, S; Angulo-Sanchez, JL, J. Appl. Polym. Sci.,
105, 2387-95, 2007.
2 Armelin, E; Pla, R; Liesa, F; Ramis, X; Iribarren, JI; Alemán, C, Corrosion Sci., 50, 3, 721-8, 2008.