Abstract
The melting behavior of isothermally crystallized it‐1‐butene/ethylene copolymers with different ethylene content has been investigated by differential scanning calorimetry (DSC) and simultaneous small‐ and wide‐angle x‐ray diffraction (SAXS/WAXS) using synchrotron radiation. A very important influence of the aging time on the structural characteristics of these copolymers has been observed. The thermal behavior determined by DSC is very complex, especially for the copolymer with the highest ethylene content. In the DSC curves, as well as the two endotherms that can be clearly assigned to Form II and Form I, several endotherms can be observed at low temperatures, which increase in intensity with increasing aging time. The WAXS measurements have ruled out the existence of a different crystalline modification. Simultaneous real‐time SAXS/WAXS experiments performed during the heating of aged samples have demonstrated that the multiple endotherms correspond to the melting of crystals with different thermodynamic stability.
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