マテリアルライフ学会誌
Online ISSN : 2185-7016
Print ISSN : 1346-0633
ISSN-L : 1346-0633
22 巻, 1 号
選択された号の論文の8件中1~8を表示しています
解説
報文
  • 東 泰, 竹田 英俊, 渡辺 真, 中谷 久之
    2009 年 22 巻 1 号 p. 20-25
    発行日: 2009/02/15
    公開日: 2021/05/08
    ジャーナル フリー

    ポリプロピレン(PP)およびPP/talcの酸化劣化挙動に光源の種類や環境の違いが与える影響を明らかにするために,PPおよびPP/talcの屋外暴露試験,キセノンランプ,メタルハライドランプおよびカーボンアークランプ各促進劣化試験を行なった.その結果,屋外暴露試験が一番低いUV(300-400nm)領域の放射露光量で酸化劣化が進んでいること,talcの存在が酸化劣化を促進することが明らかとなった.さらに,屋外暴露試験において酸性雨が酸化劣化を促進させていることが分かった.

  • Takakazu KOJIMA, Masahiro TSUCHIYA, Kaori ISHIMARU, Masakazu YOSHIHARA ...
    2010 年 22 巻 1 号 p. 26-29
    発行日: 2010/02/15
    公開日: 2021/05/08
    ジャーナル フリー

    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.

  • Vu Quoc THANG, Toshiaki TANIIKE, Masaki UMEMORI, Mitsuhiro IKEYA, Yuic ...
    2010 年 22 巻 1 号 p. 30-34
    発行日: 2010/02/15
    公開日: 2021/05/08
    ジャーナル フリー

    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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