Journal of Materials Life Society
Online ISSN : 2185-7016
Print ISSN : 1346-0633
ISSN-L : 1346-0633
Volume 29 , Issue 1
Showing 1-3 articles out of 3 articles from the selected issue
Short Review
Original Paper
  • Yoshitada SHIMIZU, Saori ISHIMI, Takashi UCHIDA, Mitsuru ARAI
    2017 Volume 29 Issue 1 Pages 6-11
    Published: February 28, 2017
    Released: May 08, 2021
    JOURNALS FREE ACCESS

    In order to establish a degradation prediction method for plastics, Chemiluminescence, which can detect the initial oxidation of the samples with high sensitivity, was applied for estimating the degradation degree of plastic samples. In this study, polypropylene was used as a sample. The samples were degradated by oxidation in a Chemiluminescence measurement device and in a thermostatic oven. The accumulate rate of peroxides amount on these samples caused by degradation were estimated by Chemiluminescence measurements with Nitrogen atmosphere. The degradation prediction of samples on 60°C was calculated by these rates on 130-150°C. This prediction value by this method showed good agreement with the result from measurements, compared with the prediction method by oxidation induction time.

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Technical Paper
  • Masahito TOYONAGA, Kazuya ONO, Manami ARAI, Toshiaki TANIIKE, Minoru T ...
    2017 Volume 29 Issue 1 Pages 12-19
    Published: February 28, 2017
    Released: May 08, 2021
    JOURNALS FREE ACCESS

    Polyethylene (PE)-based nanocomposites were developed using PE-grafted SiO2 (PE-g-SiO2) nanoparticles, which were prepared by grafting terminally hydroxylated PE having different molecular weights. The obtained PE/PE-g-SiO2 nanocomposites were characterized in terms of the nanoparticle dispersion, the crystallization, and the tensile properties in a comparative way to pristine PE, PE/SiO2 nanocomposites and previously reported polypropylene (PP)/PP-g-SiO2 nanocomposites. Similarly to the PP grafting, the PE grafting markedly improved the dispersion of the nanoparticles in the corresponding matrix and accelerated the crystallization. The addition of 5.0wt% of PE-g-SiO2 led to increments of the Young’s modulus and tensile strength over pristine PE by 23% and 11%, respectively, while the addition of unmodified SiO2 hardly improved these properties. The reinforcing mechanism in the PE/PE-g-SiO2 nanocomposites was also discussed.

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