Abstract: The optical properties of isotactic polypropylene were studied according to different crystallization temperatures. Early beginning of growth of isotactic polypropylene were observed at different stages of growth, where the structures begins with primary nuclei developed through isolated single lamella, then develops into a lamellar sheaves and finally attains the spherulitic structure. Two main types of spherulites, (alpha) and (beta) spherulites appears for the isotactic polypropylene over a wide range of crystallization temperature. However, the difference between spherulites types appears due to the difference in its contents of radial lamellae and cross hatching beside the difference in crystallization temperature and melting points
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