Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 16, Issue 9
Displaying 1-19 of 19 articles from this issue
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Index
Preface
Technical Notes : Special Issue on Polymer Processing for Fabricating Nano-Structure
Report from Universities and Institusions in Japan : 128
Report from Oversea Universities and Institutions : 65
Reports of International Meeting
Visiting Active Companies
Topic on Products and Technologies
Fountain Flow
Technical Reports
Original Papers
  • Transparent Nanocomposites of Non-Organophilic Clay/Amorphous Polymer
    Hirofumi Takase, Hitoshi Masago, Yasuhiko Mikata, Hajime Kishi, Atsush ...
    2004 Volume 16 Issue 9 Pages 610-616
    Published: September 20, 2004
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.16.610
    JOURNAL FREE ACCESS
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    Clay nanocomposites of amorphous polymers with ester groups were prepared by twin screw extrusion and injection molding. Although, in general, an organophilic clay is required to form good nanocomposites, we succeeded in preparing nanocomposites with good clay dispersion by using natural clay without organophilic agents. In this study, PETG, an amorphous polymer with excellent clarity, was used as the matrix polymer. The resultant nanocomposites retained high transparency and clarity despite the 5% clay content. Flammability properties were measured using a cone-calorimeter. The heat release rate decreased 54% for the PETG/clay nanocomposites compared to the neat PETG resin and the phenomenon of molten droplets (dripping) does not appear during the combustion. Therefore, high flame retardancy has been achieved. Furthermore, the tensile modulus of the nanocomposites increased by 50% over the neat PETG modulus. The evaluation of WAXD patterns and TEM observations indicated that the silicate layers of the clay were not intercalated nor individually exfoliated. Partial exfoliation and a decrease in the number of layers were, however, indicated.
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  • Morphology and Mechanical Properties of Quenched Polypropylene/SiO2 Nanocomposite Films
    Kazuo Asuka, Boping Liu, Minoru Terano, Koh-hei Nitta
    2004 Volume 16 Issue 9 Pages 617-622
    Published: September 20, 2004
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.16.617
    JOURNAL FREE ACCESS
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    Silica gel powders with hydrophilic surfaces were melt-mixed with isotactic polypropylene (PP) using a twin-roller. The microstructure, morphology, dynamic mechanical properties, and tensile properties of the PP/silica composites were thoroughly investigated as a function of the size and content of silica gel particles. Three kinds of silica gel particles with different diameters of 51μm, 100nm, and 26nm were used in this study. It was found that the hydrophilic silica gel could be dispersed homogeneously into the hydrophobic polymer matrix of meso-phase PP. Adding the nano-sized (26nm) silica gel led to a drastic decrease of molecular mobility in the amorphous PP region, resulting in an unexpected significant increase of Young's modulus. The weakening of tensile strength for all the composite samples was demonstrated to be dominantly caused by void-opening in the interface region between the hydrophilic particles and the hydrophobic matrix. This is due to the fact that there are no direct chemical connections between the PP matrix and silica particles.
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