Melting kinetics of it-polypropylene crystals over wide heating rates

Melting kinetics of it-polypropylene crystals has been examined over wide heating rates of 0.6 K min(-1)-10(4) K s(-1) using a standard DSC and a fast-scan DSC. With fast-scan DSC, we have an access to the melting of crystals obtained at low temperatures, which are susceptible to re-organization at the heating rates applicable with standard DSC. It is clearly discernible that the appearance and disappearance of multiple melting peaks are strongly influenced by the applied heating rates and dependent on the crystallization temperatures. By examining the heating rate dependence of superheating of melting, we have determined the melting points of as-grown crystals formed under wide crystallization temperatures.