Resources Processing
Online ISSN : 1349-9262
Print ISSN : 1348-6012
Volume 55 , Issue 2
Showing 1-2 articles out of 2 articles from the selected issue
Original Papers
  • Shigeya NAKAMURA, Katsuhisa TOKUMITSU, Mitsunobu KITAMURA, Eiichi MIYA ...
    2008 Volume 55 Issue 2 Pages 56-65
    Published: 2008
    Released: June 17, 2008
    JOURNALS FREE ACCESS
    In this study, effect of adding EEBE (ethylene-b-ethylene•buthylene-b-ethylene triblock copolymer) compatibilizer into a series of polyethylene (PE)/polypropylene (PP) blends was investigated in terms of their morphological, mechanical, and viscoelastic properties. Although the neat PE/PP blends showed brittle property, when adding EEBE as a compatibilizer into them, their tensile properties became ductile and, as a result, the elongation at break was over 1000%. From the results of the Charpy impact test, the strength of the PE/PP blends, particularly, in which PE content was more than 30wt%, increased with increasing the amount of the EEBE compatibilizer. The impact strength drastically increased around at −40°C, and the temperature corresponds to the glass-transition temperature (Tg) of EEBE, which is referred to the α dispersion on viscoelestic measurement. The morphology of PE/PP blends stained by ruthenium oxide was observed using scanning electron microscope (SEM). It shows that the size of PP domain, 4.24 μm, decreased to 1.62 μm by adding EEBE. Furthermore, the activation energies of the γ dispersion of PE, the β dispersion of PP, and the α dispersion of EEBE were not changed with PP contents and with/without EEBE, indicating that EEBE mainly influenced the free energy of the surface of PE/PP phase, not the molecular motions of PE and PP phases.
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  • Masakazu NIINAE, Yuji AOKI, Kenji AOKI
    2008 Volume 55 Issue 2 Pages 66-71
    Published: 2008
    Released: June 17, 2008
    JOURNALS FREE ACCESS
    Electrokinetic soil remediation can be used as remediation tool to extract dissolved ions and organic compounds from soils. To initiate electrokinetic transport, a DC electric potential field is applied to soils. The magnitude of the transport velocity due to electromigration and electroosmosis is directly related to the electric potential gradient. Most researches have been focused at the remediation of saturated soils. However, many contaminant sources lie within unsaturated soils as a result of leaking chemical storage tanks and landfills. Electrokinetic induced transport of soil water and ions within the water may provide a remediation alternative to unsaturated soils. Hexavalent chromium is more mobile and easily soluble. Hexavalent chromium has high solubility in water and exists as chromate, monochromate or dichromate anions depending on the pH of the solutions. This hexavalent chromium is the chemical form requiring remediation. In this study, hexavalent chromium ion transport in unsaturated soils is predicted with a simple numerical method in which electrical flow is coupled with hydraulic flow, and the treatment for unsaturated soils are investigated. The results obtained in this study are summarized as follows:
    Hexavalent chromium ion migrates toward the anode well in unsaturated soils, however, the movement in unsaturated soils is lower compared with saturated soils. And then, remediation is applied successfully to unsaturated soils by coupled electric-hydraulic gradient.
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