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Influence of β nucleation agent on the dispersion of nano-CaCO3 in isotactic polypropylene matrix

Authors

  • Yu Zhang,

    1. State Key Laboratory of Polymer Materials Engineering, Department of Polymer Materials Processing, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
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  • Hong Liu,

    1. State Key Laboratory of Polymer Materials Engineering, Department of Polymer Materials Processing, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
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  • Lei Zhang,

    1. State Key Laboratory of Polymer Materials Engineering, Department of Polymer Materials Processing, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
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  • Xiongwei Zhang,

    1. State Key Laboratory of Polymer Materials Engineering, Department of Polymer Materials Processing, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
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  • Jie Zhang

    Corresponding author
    1. State Key Laboratory of Polymer Materials Engineering, Department of Polymer Materials Processing, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
    • State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, People's Republic of China
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Abstract

To study the interaction between β-nucleation agent and nano-CaCO3 in iPP matrix, the dynamic rheology properties, crystallization and melting behaviors, impact fracture surface of β-nucleation agent (β-NA) nucleated and nano-CaCO3 filled iPP were investigated in details in this study. Under suitable conditions, the β-NA has a “promoting dispersion effect” on the dispersion of nano-CaCO3 in PP matrix. However, 0.2 wt % β-NA nucleated sample has a worse “promoting dispersion effect” than 0.05 wt % β-NA nucleated sample at relatively high nano-CaCO3 content (7.5 wt %). The reason is that 0.2 wt % β-NA aggregates on the surface of nano-CaCO3 agglomerations. The α crystals induced from β-crystals grow more regular and perfect than conventional α crystals. For the relative fraction of β crystals (Kβ), the nano-CaCO3 content has little influence on 0.05 wt % β-NA nucleated samples, but obvious effect on 0.2 wt % β-NA nucleated samples. Based on the investigated results, a mechanism model about the interaction between β-nucleation agent and nano-CaCO3 in iPP matrix is proposed. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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