Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 17, Issue 7
Displaying 1-21 of 21 articles from this issue
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Index
Preface
Research Reviews : Recent Deveropements Directions of Polymer Processing
Special Lecture - Foundation of CAE and Rheology for Polymer Processing
Technical Report
Report from Universities and Institusions in Japan : 134
Report of International Meeting
Original Papers
  • Effect of Melt Mixing on Electrical Conductivity of Vapor Grown Carbon Fiber/Polycarbonate Composites
    Takeshi Yasuda, Tatsuhiro Takahashi, Koichiro Yonetake, Kiyohito Koyam ...
    2005 Volume 17 Issue 7 Pages 490-496
    Published: July 20, 2005
    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.17.490
    JOURNAL FREE ACCESS
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    Vapor Grown Carbon Fiber (VGCF) is, due to its extraordinary electrical properties, a most promising filler for polymer composites, which are mostly prepared through melt mixing. However, little is known about the effects of melt mixing on the length of VGCF and the electrical conductivity of composites. Here, we have measured the length of VGCF and studied its relationship with the electrical conductivity in VGCF/polymer composites by varying melt mixing time.
    We used a batch type twin-screw kneader, to make composites of polycarbonate (PC) and VGCF at 260°C under 450rpm of screw speed. When the mixing time became longer, the surface resistivity increased. SEM pictures of the cross sections under various mixing times were almost identical. Longer mixing times also made the complex modules G* decrease in measurements of dynamic viscoelasticity. The length measurement of VGCF showed that the average length of VGCF as received was 5.94μm. When melt mixing times increased from 7 to 600 seconds, the VGCF length decreased from 5.76 to 3.96μm. It is believed that the initial clumps of VGCF are unexpectedly easily dispersed by a very small shear strain. At larger strains, the VGCF lengths reduce causing the increase in surface reisistivity.
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