Effect of silica on spherulite structure and photo-oxidative degradation behavior in polypropylene/silica nanocomposites

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  • ASUKA Kazuo
    School of Material Science Japan Advanced Institute of Science and Technology
  • SUMINO Ken-ichi
    School of Material Science Japan Advanced Institute of Science and Technology
  • TANIIKE Toshiaki
    School of Material Science Japan Advanced Institute of Science and Technology
  • NITTA Koh-hei
    Department of Chemical Engineering Kanazawa University
  • TERANO Minoru
    School of Material Science Japan Advanced Institute of Science and Technology

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  • Effect of Silica on Sherulite Structure and Photo-oxidative Degradation Behavior in Polypropylene/Silica Nanocomposites

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The physico-chemical interaction between hydrophobic polyolefin materials and originally hydrophilic inorganic nano-particles like surface hydroxylated SiO2 has not been well understood up to now. In this study, the influences of particle size, content of hydrophilic SiO2 nanoparticles on the isothermal growth rate of polypropylene (PP) spherulites in various PP/SiO2 nanocomposites were investigated by polarized optical microscope equipped with temperature controlled hot stage. Moreover, photo-oxidative degradation behavior of the PP/ SiO2 nanocomposites were investigated. It is most interesting to note that the addition of smaller SiO2 nanoparticles effectively lowered the growth rate of PP spherulites in the composites and the spherulite growth rate became zero for the PP/16nm-SiO2 nanocomposites with the SiO2 content above 2.5 wt%. It was found that the sample without spherulite morphology is more stable to photo-degradation. Spherulite structure is considered to have the influence affect photo-oxidative degradation.

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