NIPPON GOMU KYOKAISHI
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Volume 48, Issue 9
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1975Volume 48Issue 9 Pages 537-557
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.537
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1975Volume 48Issue 9 Pages 558-569
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.558
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1975Volume 48Issue 9 Pages 570-578
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.570
    JOURNAL FREE ACCESS
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  • PHYSICAL PROPERTIES OF THE BLOCK COPOLYMERS OF POLY-STYRENE HAVING VINYL GROUPS WITH METHYL-ACRYLATE
    Yasuhiro ISHIKAWA, Kunio KAGEYAMA, Fumito WATANABE, Tatsuro OUCHI, Min ...
    1975Volume 48Issue 9 Pages 579-583
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.579
    JOURNAL FREE ACCESS
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    Block copolymers of methylacrylate (MA) with poly-styrene (PSt) having pendant vinyl groups or PSt having vinyl end groups were investigated.
    PSt having vinyl groups was prepared from a copolymer of St with vinylene carbonate. The decomposition of the part of vinylene carbonate gave poly (St-co-vinylen-glycol). A pendant methacrylate was introduced through reaction of adjacent glycol with methacrylic chloride. PSt having carboxyl end groups was perpared through decomposition of the adjacent glycol. The reaction of carboxyl groups with vinyl acetate gave PSt having vinyl acetate end derivatives.
    Since the block copolymers of PSt-derivatives with MA were transparent materials, PSt block was plasticised with PMA block.
    The results of tests on the dynamic viscoelastisity show very broad tan δ peaks as well as the effect of block copolymer.
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  • VULCANIZATION OF RUBBERS WITH SLUDGE INVOLVING CHROMIUM
    Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Tokushige SAWADA
    1975Volume 48Issue 9 Pages 584-590
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.584
    JOURNAL FREE ACCESS
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    For effective application of the sludge, which is formed by chemical treatment of waste plating bath and contains of chromium as the main component, the compounding effect of heat treated sludge on natural and synthetic rubbers was examined.
    As a result of the compounding of sludge, the Mooney-viscosity of rubbers decreased very much in NR and IR. The tensile and adhesive properties of vulcanizates were considerably improved. In the cases of polar rubbers such as NBR and CR, the sludge acted as a vulcanization accelerator. The heat resistance of vulcanizates compounded with the sludge was not so inferior to the control. In moreover, CR could be vulcanized by the addition of sludge only without any usual sulfur, accelerators and metal oxides. Also it was found that the sludge had a filler effect on rubber like a common carbon black.
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  • THE INHIBITION OF VOLATILE MATTERS IN THE VULCANIZATION OF EPICHLOROHYDRIN-ETHYLENE OXIDE RUBBER
    Yoshiro NAKAMURA, Kunio MORI
    1975Volume 48Issue 9 Pages 591-594
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.591
    JOURNAL FREE ACCESS
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    Propylene, methyl chloride, acetaldehyde, allyl chloride, acetone and methanol are detectable in the volatile gas generated from epichlorohydrin•ethylene oxide rubber (CHC) which has been heated at 160°C for 30min. Each volume of these gases is observed to increase with an increasing time of roll-blending with carbon black. The same kinds of gases are also determined in the volatile gas in CHC-vulcanization at 160°C. In addition, hydrogen sulfide is detectable in the vulcanizing compositions such as 2-mercapto imidazoline Pb3O4 and AF•CaCO3 at 160°C. The generation of hydrogen sulfide can be almost inhibited by addition of a sodium or calcium salt of AF in place of AF in the vulcanizing composition of AF•CaCO3. The volume of acetaldehyde and organic chloride can be also decreased by addition of ethylene urea or fatty amides in the vulcanizing composition described above.
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  • [title in Japanese]
    [in Japanese]
    1975Volume 48Issue 9 Pages 595-596
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.595
    JOURNAL RESTRICTED ACCESS
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