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Materiale Plastice
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https://doi.org/10.37358/Mat.Plast.1964

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Materiale Plastice (Mater. Plast.), Year 2009, Volume 46, Issue 2,





Doina Dimonie, Cornelia Vasile, Ramona Marina Coserea, Sorina Garea, Felicia Andrei Characterization of the Nucleation Efficiency Based on Crystallization Behaviour and Other Polypropylene Properties


Abstract:
The more reliable values of the crystallization temperature were obtained from the non - isothermal DSC thermograms recorded at low cooling rate. The crystallization time was evaluated from the isothermal DSC thermogrames recorded at those temperatures at which the crystallization occurs. PP nucleated with Irgastab NA 21, has crystalline phase that contains the smallest spherulites, as compared to those nucleated with Irgastab NA 04 and Irgaclear DM. The incorporation of the nucleating / clarifying agents into the polymer matrix is homogeneous only if the melt processing conditions were well defined for each of them. A dependence on the molecular weight of the nucleated PP morphology was observed. The spherulite size decreases with the increase of the molecular weight. Keywords: crystalization, nucleation, polypropylene, nucleating agent, spherulite



Issue: 2009 Volume 46, Issue 2
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