| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 672918 | Thermochimica Acta | 2015 | 5 Pages |
•An additional crystallization process of polypropylene is obtained the first time.•This process occurs in the temperature range between 45 °C and 75 °C.•In this temperature range α-phase crystals are formed.•We interpret this process as differently nucleated α-phase crystallization.
The non-isothermal and isothermal crystallization of different types of commercial polypropylenes (PP) are investigated by fast scanning calorimetry and wide-angle X-ray scattering. Typically, PP shows two different crystallization processes: below 55 °C the mesophase formation and at higher temperatures the α-phase formation. Here we report the first observation of an additional crystallization process in some PP-types. It is observed between 45 °C and 75 °C, and is understood as a consequence of an additional nucleation of α-phase crystals.
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