Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 4, Issue 2
Displaying 1-2 of 2 articles from this issue
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  • Thermo-Oxidative Degradation of Polypropylene by Use of Screw Extruders
    III. Inflation Film
    Mitsuyoshi FUJIYAMA, Tetsuo WAKINO
    1992 Volume 4 Issue 2 Pages 114-121
    Published: February 20, 1992
    Released on J-STAGE: November 18, 2009
    DOIhttps://yz-jsjc-gov-cn-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4325/seikeikakou.4.114
    JOURNAL FREE ACCESS
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    A homo polypropylene and two polypropylene copolymers with ethylene were thermo-oxidatively degraded by use of screw extruders. They were processed into inflation films and the effect of degree of degradation on the structures and properties of the films were studied.
    Films processed from degraded polypropylenes show superior transparency and (low temperature) dart impact strength and show inferior openability and slipperiness. Tensile modulus and yield strength are scarcely changed by degradation. This is because films processed from degraded polypropylenes contain more amorphous phase than ones processed from undegraded polypropylenes.
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  • Effect of Internal Structure upon the Friction and Wear Properties of Plastics
    Isamu SEKIGUCHI, Yukisaburo YAMAGUCHI, Seiichi TAKANE, Jiro MATSUMOTO, ...
    1992 Volume 4 Issue 2 Pages 122-129
    Published: February 20, 1992
    Released on J-STAGE: November 18, 2009
    DOIhttps://yz-jsjc-gov-cn-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4325/seikeikakou.4.122
    JOURNAL FREE ACCESS
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    The effects of internal structure, degree of polymerization, crystallinity and molecular orientation upon the friction and wear properties of plastics against steel were studied in this article.
    1) The friction coefficients of polyethylene (PE) and polyacetal (POM) increase with the increasing of molecular weight. The sliding wear rate (Vs) of POM increases with the increasing of molecular weight.
    2) The friction coefficients of PE, polyethylene terephthalate (PET) and polytetrafluoroethylene (PTFE) decrease with the increasing of crystallinity degree. The Vs of PE and POM decrease with the increasing of crystalinity degree, that Vs of PTFE increases with the increasing of crystalinity degree.
    3) The friction coefficients of PE, PET and PTFE for the orientated direction decrease with the increasing of the orientated direction and degree of oriention.
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