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Nanocomposite fibers of isotactic polypropylene -fumed silica AR805 were prepared by melt compounding using a two-step process: melt-spinning and hot drawing at various draw ratios up to 15. Transmission electron microscopy revealed uniform dispersion of the silica nanoparticles in polypropylene matrix, although at higher concentrations and lower draw ratios the nanoparticles showed increasing tendency to form small agglomerates. On the other hand, at low concentrations the uniform distributiondoi:10.3144/expresspolymlett.2015.25 fatcat:c6n2nwafcfhvrhkxja7h5helpa