Nucleation parameter and size distribution of critical nuclei for nonisothermal polymer crystallization: The influence of the cooling rate and filler

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[1] Kocic, Nikola
[2] Lederhofer, Sara
[3] Kretschmer, Karsten
[4] Bastian, Martin
[5] Heidemeyer, Peter
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Kocic, Nikola | 1600年 / John Wiley and Sons Inc卷 / 132期
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The nucleation parameter Kg of filled PP; HDPE; and PA6 is determined through nonisothermal DSC measurements. A novel method is proposed for the determination of the size distribution of critical nuclei; where the most commonly found fraction lpeak∗ was obtained as a peak value. The models are tested at different cooling rates and different filler loadings. Kg varies up to a certain cooling rate and afterwards remains constant. The introduction of talc in PP and HDPE facilitates nucleation and thus reduces Kg. An opposite trend occurs upon the addition of bentonite in PA6. The changes of Kg and lpeak∗ are reflected on sample morphology; as confirmed with SAXS. The ratio between the final crystal thickness and lpeak∗ amounts to approx. 2 and thus agrees well with the one listed in literature. The simple linear correlations of the obtained Kg are established with Young's modulus and yield stress. © 2014 Wiley Periodicals; Inc; J; Appl; Polym; Sci; 2015; 132; 41433. © 2014 Wiley Periodicals;
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