NIPPON GOMU KYOKAISHI
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Volume 53, Issue 11
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1980 Volume 53 Issue 11 Pages 649-657
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_649
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 11 Pages 658-665
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_658
    JOURNAL FREE ACCESS
    Download PDF (615K)
  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 11 Pages 666-673
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_666
    JOURNAL FREE ACCESS
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  • STUDIES ON STRUCTURE AND PHYSICAL PROPERTIES OF VULCANIZATES CONTAINING COMMINUTED VULCANIZATES
    (IV) COMPARISON BETWEEN EXPERIMENTS AND THEORY OF ZERO DIMENSIONAL MODEL OF TRANSFER AND REACTION OF SULFUR IN VULCANIZATES CONTAINING COMMINUTED VULCANIZATES
    Kunihiko FUJIMOTO, Toshio NISHI
    1980 Volume 53 Issue 11 Pages 674-679
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_674
    JOURNAL FREE ACCESS
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    Theory of zero dimensional model of transfer and reaction of sulfur in vulcanizates containing comminuted vulcanizates has been developed in the former paper taking into account the solubility, diffusion, and crosslink reaction of sulfur in each phase. Predicted equations on sulfur concentration and crosslink density in rubber matrix and comminuted vulcanizates are compared with experimental results in this report.
    There is found good correlation between calculated results and experimental values. Quantitative relation between solubility, diffusion, and crosslink reaction of sulfur in each phase has been established.
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  • VULCANIZATION REACTION OF SBR RUBBER BY 6-DIBUTYLAMINO-1, 3, 5- TRIAZINE -2, 4- DITHIOL AND 2, 2′- BIS (BENZOTHIAZYL) DISULFIDS
    Kunio MORI, Yoshiro NAKAMURA, Hiromi YANATA, Minoru SAITO
    1980 Volume 53 Issue 11 Pages 680-686
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_680
    JOURNAL FREE ACCESS
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    Vulcanization reaction of SBR by using 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol (DB), 2, 2′- bis(benzothiazyl)disulfide (MBTS) and ZnO has been investigated for an apparent rate constant (kob), an induction period (t10) and the degree of vucanization (fmax-fmin) at 170°C. The vucanization occured in the case of the co-presence of DB, MBTS and ZnO, and was influenced by the mixing ratio (r) of DB aginst MBTS: kob increased with increase in r, and fmax-fmin in l/r; but t10 had an maximum value at r=0.5. These were explained from the results that the reaction products of DB with MBTS differ with r as follows. The crosslinking
    DB+MBTS→R(_??_)nR+_??_=S
    r<1; R=_??_-S-, r_??_1; R=H
    chain, 2, 4-bis(S-substituent thio)-6-dibutylamino-1, 3, 5-triazine structure was confirmed by the IR spectra measurement and the elemental analyses of the SBR vulcanizates, and seems to be produced by the attack of a thiyl radical aginst the allyl type-methylene structure in SBR rubber, which are formed by the fission of a S-S bond in the reaction products.
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  • MODIFICATION OF POLYURETHANE ELASTOMERS (VII)
    REINFORCEMENT OF POLYURETHANE WITH AMINO-TERMINATED LIQUID N-BUTYL ACRYLATE OLIGOMERS
    Eisuke YAMADA, Shinji INAGAKI, Hiroshi OKAMOTO, Junji FURUKAWA
    1980 Volume 53 Issue 11 Pages 687-692
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_687
    JOURNAL FREE ACCESS
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    n-Butyl acrylate was telomerized with bis(4 amino phenyl)disulfide to yield liquid oligomers which had amino groups at each ends of the moleculer chain. The effects of molar ratio of bis (4 amino phenyl)disulfide to n-butyl acrylate on the yield and the molecular weight of the oligomer were investigated. The oligomers produced were brown liquids with a molecular weights of 1, 500-6, 500.
    These amino-terminated n-butyl acrylate oligomers were then added during the preparation of polyurethane by the one-shot method, and the physical properties of the modified polyurethanes were examined. These oligomers improved remarkably the mechanical and thermal properties of the polyurethane elastomers. Thus, the oligomers may be useful as a reactive filler or a crosslinking agent which takes part in the crosslinking reaction of polyurethane.
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  • MODIFICATION OF POLYURETHNE ELASTOMERS (VIII)
    MODIFICATION OF POLYURETHANE EIASTOMERS DERIVED FROM HYDROXYL-TERMINATED LIQUID POLYBUTADIENES BY THE ADDITION OF VINYL MONOMERS
    Shinji INAGAKI, Eisuke YAMADA, Hiroshi OKAMOTO, Junji FURUKAWA
    1980 Volume 53 Issue 11 Pages 693-696
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_693
    JOURNAL FREE ACCESS
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    Vinyl monomer was added during the preparation of polyurethane elastomer by the one-shot reaction between hydroxyl-terminated liquid polybutadiene(HTPB) and tolylene diisocyanate (TDI). However, the effect of the addition of vinyl monomer on tensile properties was small compared with that in the case of poly(oxy-propylene glycol)-polyurethane which has been reported in earlier papers.
    Then, modifided HTPB was synthesized by the addition reaction of HTPB with carbon tetrachloride. Vinyl monomer-modified polyurethane elastomers derived from carbon tetrachloride-treated HTPB turned out excellent in properties such as tensile properties, hydrolytic resistance and flame retardancy.
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  • STUDY ON FAILURE MECHANISM OF RUBBER VULCANIZATES(XII)
    FATIGUE PROCESS (PART IV) APPROXIMATE EQUATION FOR THE STRESS AND TEMPERATURE DEPENDENCE OF FATIGUE LIFE OF RUBBER VULCANIZATES
    Kunihiko FUJIMOTO, Toshio NISHI
    1980 Volume 53 Issue 11 Pages 697-700
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_697
    JOURNAL FREE ACCESS
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    Master fatigue life curve for rubber vulcanizates has been constructed from applied stress σ and fatigue life tb normallized by stress at break σb and time until break τb under simple elongation. If temperature dependence of σb and τb is approximated by exponential function, the fatigue life (tb)σ, T of vulcanizates at a given stress σ and temperature T can be estimated by the next equation.
    log(tb)σ, T=log(tb)σs, Ts+mlogσ/σs+(ΔEε/R-mΔEσ/R)(1/T-1/Ts)
    Here, (tb)σs, Ts is the fatigue life of vulcanizates under standard stress σs and temperature Ts. m is a constant and R is the gas constant. ΔEσ and ΔEε are the apparent activation energy for the temperature dependence of the strength and elongation of vulcanizates under thermal degradation, respectively.
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  • IMPROVEMENT OF PROPERTIES OF POLYURETHANE BY SIMULTANEOUS POLYMERIZATION OF VINYLMONOMERS
    Fumio ODAKA, Yoshihiko FUJII, Yoji WATABE, Yutaka ISEDA
    1980 Volume 53 Issue 11 Pages 701-705
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_701
    JOURNAL FREE ACCESS
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    Simultaneous radical polymerization of vinylmonomers was carried out to improve wet skid resistance (Wet SR) of polyether- and polyester-based polyurethane. The amount of the monomers used was 10-15wt% in order to keep the rubberlike elasticity of polyurethane. Wet SR was enhanced by all the monomers employed, but it was enhanced without decreace of tensile properties only by nonpolar monomer such as divinylbenzene. They were decreased by polar monomers. Further, Wet SR of polyurethane was, inspite of its high modulus, found to have the same correlation with the loss tangent and modulus as presented for rubber for automobile tire by Yamamoto.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 11 Pages 706-707
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.11_706
    JOURNAL RESTRICTED ACCESS
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