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A . Romankiewicz, T. Sterzyński

Establishing polymer's crystallization temperature by the self- nudeation test.


Polimery 1999, No 11-12, 784

DOI: dx.doi.org/10.14314/polimery.1999.784


Crystallizability of polymers, defined by the crystallization temperature (Tcr), can be determined using the self-nucleation effect. Tire temperature can be established by assuming polymer's own macromolecules to be the most effective nucleating agent. Cooling a polymer specimen in a DSC run from the self-seeding temperatures (Ts), i.e., ones contained within the domain of partial melting of the polymer, allows to determine Tcr For isotactic polypropylene (Novolen 1100H, BASF, Germany, density 910 kg/m3, melt flow rate 2.4 cm3/10 min), the temperature range corresponding to partial melting of the polymer was established by DSC (Netzsch 200) to extend from 164 °C to 174 °C. Crystallization was carried out at a cooling rate of 5 °C/min. Tire minimum crystallization temperature (Tcr, min) was 116.3°C; the maximum Tcr, max was equal to 150.3 °C and corresponded to Ts = 163.8 °C.

Keywords: isotactic polypropylene, crystallization temperature, nucleation, DSC

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