Journal of Materials Life Society
Online ISSN : 2185-7016
Print ISSN : 1346-0633
ISSN-L : 1346-0633
Volume 22 , Issue 1
Showing 1-8 articles out of 8 articles from the selected issue
Short Reviews
Original Papers
  • Yutaka AZUMA, Hidetoshi TAKEDA, Shin WATANABE, Hisayuki NAKATANI
    2009 Volume 22 Issue 1 Pages 20-25
    Published: February 15, 2009
    Released: May 08, 2021
    JOURNALS FREE ACCESS

    Study on factors affecting weatherability of polypropylene materials was carried out with one outdoor weathering test and three accelerated weathering (xenon, metal halide and carbon arc lamps) tests, respectively. The degradations of these materials were highly accelerated with the lowest amount of UV exposure energy in case of the outdoor exposure. It was found that the visible light intensity during irradiations and the existence of talc compound affected the rate of degradation. In addition, it was confirmed that the acid rain accelerated the degradation of PP materials in outdoor exposure.

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  • Takakazu KOJIMA, Masahiro TSUCHIYA, Kaori ISHIMARU, Masakazu YOSHIHARA ...
    2010 Volume 22 Issue 1 Pages 26-29
    Published: February 15, 2010
    Released: May 08, 2021
    JOURNALS FREE ACCESS

    The thermolysis/distillation of a polyethylene (PE) was studied under an atmospheric pressure and under an extra pressure. One potential application for the products is in the production of liquid fuels. The products were identified by pyrolysis GC/MS. The pressure was controlled by outlet size (around 0.1mm diameter). The product from an outlet of 5mm diameter (under an atmospheric pressure) consists of hydrocarbons with C10-C40. The product from an outlet of 0.1mm diameter consists of hy-drocarbons with C7-C18, which are similar to those evolved in the initial decomposition. Furthermore, the boiling point ranges of their hydrocarbons are close to those of components of kerosene.

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  • Vu Quoc THANG, Toshiaki TANIIKE, Masaki UMEMORI, Mitsuhiro IKEYA, Yuic ...
    2010 Volume 22 Issue 1 Pages 30-34
    Published: February 15, 2010
    Released: May 08, 2021
    JOURNALS FREE ACCESS

    The morphological stability of initially formed polymer particles against air was improved in order to study the initial morphology development with Zigler-Natta catalyst olefin polymerization. The stopped-flow polymerization technique was applied to synthesize initial polymer particles in combination with various quenching and stabilizing procedures. When polymerizing particles were quenched with cold heptane maintained at -65ºC under N2 or CO2, the exposure of the formed particles to air caused the fast formation of cracks on the surface, leading to serious reformation of the particle shape. However, when the particles were quenched with cold heptane under CO2 and washed with heptane containing an appropriate amount of tetrahydrofuran, the particle morphology was significantly stabilized which hardly changed even after 1 h exposure to air. The established stabilizing procedure is highly useful for various characterizations of the initially formed particles.

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