NIPPON GOMU KYOKAISHI
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Volume 82, Issue 6
Displaying 1-7 of 7 articles from this issue
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Regular Papers
  • Synthesis of Butyl Rubber Containing 4-Vinylphenyl Group by Using Suzuki-Miyaura Coupling Reaction
    Masumi SUZUKI, Hiroki TAKESHITA, Masamitsu MIYA, Katsuhiko TAKENAKA, T ...
    2009 Volume 82 Issue 6 Pages 241-246
    Published: 2009
    Released on J-STAGE: April 14, 2010
    DOIhttps://doi.org/10.2324/gomu.82.241
    JOURNAL FREE ACCESS
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    Suzuki-Miyaura coupling reaction of brominated butyl rubber (BIIR) with 4-vinylphenylboronic acid were carried out in THF using cyclopalladated complex as catalyst. The degree of 4-vinylphenyl group introduction was estimated from the ratio of RI and UV peak area in the size exclusion chromatogram (SEC) of modified butyl rubber (St-IIR). Considerable amount of 4-vinylphenyl group could be introduced to butyl rubber in the presence of small amount (Pd/Br≈1/1000) of Pd catalyst.
    Quantitative analysis for the degree of 4-vinylphenyl group introduction was made by 1H-NMR. The exo methylene signals in BIIR decreased by the reaction whereas signals attributable to the viny protons of 4-vinylphenyl group increased with reaction time. When reaction was carried out in THF at reflux temperature for 12 h in the presence of 0.01 eq. of Pd catalyst, 4-vinylphenyl group was introduced quantitatively. The peroxide curing behavior of St-IIR was also examined.
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Technical Papers
  • Improvement in Dispersion of MWCNTs into EPDM
    Hitoshi IWABUKI, Toru NOGUCHI, Kenji TAKEUCHI, Morinobu ENDO
    2009 Volume 82 Issue 6 Pages 247-251
    Published: 2009
    Released on J-STAGE: April 14, 2010
    DOIhttps://doi.org/10.2324/gomu.82.247
    JOURNAL FREE ACCESS
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    In this study, we examined the improvement in dispersion of multi-walled carbon nanotubes (MWCNTs) into ethylene-propylene-diene rubber (EPDM). The dispersion of MWCNTs was observed by an optical microscope and a scanning electron microscope. Normally, MWCNTs were hardly dispersed into non-polar EPDM matrix, and large agglomerates of MWCNTs were observed in the composites. Increase of the mixing time decreased the number of large agglomerates of MWCNTs. At the same mixing time, the higher the milling temperature was, the worse the macro-dispersion of MWCNTs became. However, in order to disperse MWCNTs finely and uniformly, it was effective to raise the mixing temperature.
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General Reviews
  • DLC Film Formation Technologies by Applying Plasma Based Ion Implantation / Deposition and Industrial Application onto Rubbers and Plastics
    Yasuo SUZUKI
    2009 Volume 82 Issue 6 Pages 252-257
    Published: 2009
    Released on J-STAGE: April 14, 2010
    DOIhttps://doi.org/10.2324/gomu.82.252
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    DLC (Diamond-Like Carbon) film formation technologies on the surface of 3-dimensional substrates by a uniform plasma-based ion implantation / deposition (PBIID) have been developed by applying pulse voltage coupled with RF voltage to the substrates, such as plastics, rubbers as well as metals with the similar deposition rate. DLC film onto rubbers, plastics is effective to wear resistance, low friction, gas barrier, corrosion resistance, anti thrombus and non-cohesiveness. These technologies are widely applicable to the automobile parts, mechanical parts, electronic parts and metal molds for rubbers and plastics.
    In this paper, the DLC film formation technologies by applying both RF and pulse voltage, their applications and their prospect are presented.
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  • Improvement of Durability for Acrylic Rubbers
    Iwao MORIYAMA
    2009 Volume 82 Issue 6 Pages 258-263
    Published: 2009
    Released on J-STAGE: April 14, 2010
    DOIhttps://doi.org/10.2324/gomu.82.258
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    Industrial production of acrylic rubber (ACM) started over a half-century ago. ACM has mainly been applied to O-rings and oil-seals for automobiles. To correspond to the requirements of increasing guarantee period for automotive parts, much efforts have been made to improve the durability of sealing parts. Some heat resistant ACMs were developed by introducing new monomers into main chain structure. However, these challenges were not successful because of the insufficient processability. Another method to improve the heat resistance was the development of novel crosslinking systems. In this paper is mainly explain the developed crosslinking systems for ACM in terms of the heat resistance.
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  • Tubular Polymers: Syntheses and Properties
    Kenji ICHIOKA, Chisato HAYASHI, Masato SUZUKI
    2009 Volume 82 Issue 6 Pages 264-271
    Published: 2009
    Released on J-STAGE: April 14, 2010
    DOIhttps://doi.org/10.2324/gomu.82.264
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    A tubular structure, which has highly anisotropic space, causes unique character and functionality. This review article deals with syntheses and some properties of polymer molecules having tubular structures. There are summarized three synthetic approaches (A, B, and C) for such polymers. A) Layered bridging of macrocyclic compounds: A cyclodextrin tube is easily prepared with the aid of the sledding polymer template and used as a host for an alkyl chain or a linear polymer. The tubular oligomers of calix[4]arenes with oxyethylene linkages are examined for shuttling of a metal cation. The well-defined tubular polymers have not yet been prepared from calixarene and crown ether. B) Coupling of two wagon-head molecules: A couple of ladder silsesquioxanes are interconnected with each other through hydrosilylation, however, producing an imperfect tube. C) Removal of the internal core from a columnar core-shell molecule: The columnar alignment of the dendrimer by linking the tin-porphyrin core is followed by cross-linking the outer allylic groups to fix the column structure. Then, the porphyrin core is removed by the ester exchange reaction to give the tubular molecule.
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Advanced Course on Rubber Science and Technology
Technical Note
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