The isotactic polypropylene (iPP) fibers are among the most important synthetic fibers. To improve their mechanical properties many attempts have been made through last years. One manner of overcoming this problem is presented in this paper. Our modification introduced into the traditional technology of manufacturing iPP filament, consisted in physical blending of iPP for textile use with a special clay reinforcement CloisiteÒ 30B obtained from Southern Clay Products Inc. in the melt. Our iPP/Cloisite 30B composite fibers (0-5% of the nano-filler) were formed from the melt by means of a laboratory spinning machine. The main goal of investigations presented in this paper was to determine the influence of the content of nanoclay on the supermolecular structure of fibers formed from such modified iPP by means of X-ray (WAXS and SAXS) and the differential scanning calorimetry (DSC) methods. In our DSC study we also took an attempt to describe the transformation of the crystalline phase of modified undrawn iPP fibers occurred under the influence of conditions of the formation process. The crystallinity index was evaluated on the basis of the melting enthalpy determinated by the extrapolation from the melt. The "pseudo-c_p" DSC measurements were performed.

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