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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 7/2015

01.07.2015 | Original Contribution

Understanding the effects of nucleating agent concentration on the polymorphic behavior of β-nucleated isotactic polypropylene with different melt structures

verfasst von: Jian Kang, Zhengfang Chen, Feng Yang, Jinyao Chen, Ya Cao, Gengsheng Weng, Ming Xiang

Erschienen in: Colloid and Polymer Science | Ausgabe 7/2015

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Abstract

To elucidate the synergetic effect in enhancing β-crystallization between β-nucleating agent (β-NA) and ordered structures of isotactic polypropylene (iPP), i.e., ordered structure effect (OSE), in this study, the role of β-NA concentration (Cβ-NA) was studied by differential scanning calorimetry (DSC) and in-situ small-angle X-ray scattering (in-situ SAXS). Results showed that Cβ-NA was a determining factor of OSE: Cβ-NA < 0.01 wt% was too low to induce β-crystallization while Cβ-NA ≥ 0.09 wt% was saturated β-NA concentration, and none of them can induce OSE; only when Cβ-NA = 0.01–0.08 wt% (i.e., unsaturated concentration) can OSE take place. There existed a competitive relationship in the enhancement of β-phase between OSE and conventional β-nucleation effect of β-NA. Moreover, in-situ SAXS revealed that at T f = 190 °C (around upper limiting temperature for occurrence of OSE), when Cβ-NA was different, the geometric shapes of ordered structures in iPP melts were quite different from each other. The involved mechanism was proposed.
Vorheriger Artikel Dielectric relaxation of 1-methylimidazole-ethanol mixtures at the microwave frequency
Nächster Artikel Colloidal crystallization of C60/polymer-grafted silica particles in organic solvent

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Metadaten
Titel
Understanding the effects of nucleating agent concentration on the polymorphic behavior of β-nucleated isotactic polypropylene with different melt structures
verfasst von
Jian Kang
Zhengfang Chen
Feng Yang
Jinyao Chen
Ya Cao
Gengsheng Weng
Ming Xiang
Publikationsdatum
01.07.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 7/2015
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-015-3605-9

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