The composites of jute fabrics (hessian cloth) and polycarbonate were prepared by compression molding. The jute surface was modified with gamma-aminopropyl trimethoxy silane (Z-6011) to improve interfacial adhesion between jute and polycarbonate. The treated and untreated jute surfaces as well as composites were investigated by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Environmental scanning electron microscopy, Dynamic mechanical analysis, and mechanical testing. XPS and FTIR assure that the silane plays important role to form interfacial bonding with the jute fibers and polycarbonate. The surface topography of silanized and virgin fibers, and the interfacial adhesion properties of the composite were investigated by ESEM. DMA analysis shows the improved storage and loss moduli of silanized jute composite as compared to the untreated one. The modified jute composite also produces enhanced mechanical properties. (c) 2006 Wiley Periodicals, Inc.