Abstract
The crystallization and lamellar morphology of isotactic polypropylene (ipp) have been investigated by thermal analysis and electron microscopy. When ipp samples are crystallized above 132°C, no β-phase was detected and the samples consisted of pure α-spherulites and those showing double melting endotherms, the occurrence of double-peak shapes was attributed to the melting and reorganizing of the radial dominant lamellae, while melting of tangential cross-hatched lamellae belongs to the broad tail endotherm which leads the lower melting endotherm peak.
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