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The β-crystalline form of wollastonite-filled polypropylene

Authors

  • Liu Jingjiang,

    1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, People's Republic of China
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  • Wei Xiufen,

    1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, People's Republic of China
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  • Guo Qipeng

    Corresponding author
    1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, People's Republic of China
    • Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022, People's Republic of China
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Abstract

A study has been made of the thermal, X-ray diffraction, and dynamic mechanical characteristics of polypropylene (PP1330, a copolymer containing 22% ethylene) filled with wollastonite. Various levels of β-form crystallinity were produced in the PP by mixing in varying amount of wollastonite. It has been found that all the wollastonite-filled samples contain both the α-and the β-forms, and four melting transitions were observed instead of only two of the unfilled PP on the DSC scan. The conversion of the β-to the β-form on heating has been observed. The relative amount of the β-form in the samples was measured from WAXS data by the K value. The K value obtained increases with increasing wollastonite content. Dynamic mechanical measurements showed an increase in the magnitude of the damping in the high-temperature region for the wollastonite-filled PP and the contribution from the filler-matrix boundary. Wollastonite acted as both a reinforcement and a β-nucleator for PP.

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