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Short glass fiber Type E was coated with electrically conducting polyaniline (PAn) by in situ chemical polymerization. The resulting PAn coated glass fiber, with surface conductivity of 3.3 × 10−1 S/cm, was melt‐compounded with isotactic polypropylene (iPP). Polypropylene grafted with maleic anhydride was investigated as an adhesion promoter for these composites. Differential scanning calorimeter and polarized light microscopy indicates that the PAn coated glass fiber has a strong nucleating activity towards iPP. Scanning electron microscopy showed the improvement in the wetting and dispersion of the fibers when the adhesion promoter was added, although this also led to fiber encapsulation and lowering the electrical conductivity of the composites. The adhesion promoter greatly improved the Young's modulus of the composites, and a reaction between the maleic anhydride groups of the adhesion promoter and the PAn was proposed. Composites with an electrical conductivity greater than 10−9 S/cm were achieved using a 30 wt % of PAn coated glass fiber. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

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Aminated poly(propylene) was prepared by reacting aliphatic primary diamines with maleic‐anhydride‐functionalized poly(propylene) by in situ melt reaction. Around 60–70% of the initial acid groups had reacted to form amide and imide groups as confirmed by the almost complete disappearance of the maleic anhydride peak in FT‐IR spectra. The molecular weight of the diamines had an influence on changes in molecular structure of the PP‐g‐NH2 as a result of secondary reactions such as chain extension and cross‐linking. PP‐g‐NH2 and polycarbonate were pressed into two‐layer films and their adhesion strength was measured. The results showed that PP‐g‐NH2 was a very effective adhesion promoter.