NIPPON GOMU KYOKAISHI
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Volume 44, Issue 11
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1971 Volume 44 Issue 11 Pages 881-896
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.881
    JOURNAL FREE ACCESS
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  • Photoelasticity
    [in Japanese]
    1971 Volume 44 Issue 11 Pages 897-910
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.897
    JOURNAL FREE ACCESS
    Download PDF (2536K)
  • [title in Japanese]
    [in Japanese]
    1971 Volume 44 Issue 11 Pages 911-914
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.911
    JOURNAL FREE ACCESS
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  • VULCANIZATION OF RUBBER BY TEREPHTHALOYL PHENYLHYDRAZIDE CHLORIDE
    STUDY ON NON-SULFUR VULCANIZATION OF RUBBER (II)
    M. Hayashi, S. Yamashita, N. Kawabata
    1971 Volume 44 Issue 11 Pages 915-922
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.915
    JOURNAL FREE ACCESS
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    Unsaturated rubbers such as BR, SBR and IR were found to be easily vulcanized by heating with terephthaloyl phenylhydrazide chloride (TPC) in the presence of hydrogen chloride acceptors, e.g., triethylamine, triethanolamine and lead oxide. The TPC vulcanizate was excellent in heat resistance under the oven aging and the strength of the vulcanizate was analogous to that of usual sulfur-accelerated vulcanizate.
    A mechanism was proposed for this non-sulfur vulcanization; the bases such as triethylamine eliminate hydrogen chloride from TPC to afford dinitrilimine dipole, which forms a pyrazoline ring by 1, 3-dipolar cycloaddition reaction with carbon-carbon double bond of rubber to give a vulcanizate.
    Moreover, sheets of BR and SBR carbon black stocks compounded with TPC were vulcanized by dipping in triethylamine-ethanol solution.
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  • GRAFT COPOLYMERIZATION OF METHACRYLOYL-L-GLUTAMIC ACID AND ITS DIETHYLESTER ONTO NATURAL BUBBER
    (PART XII) STUDIES ON NATURAL RUBBER
    Y. Kozai, Y. Ikeda, H. Murata
    1971 Volume 44 Issue 11 Pages 923-928
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.923
    JOURNAL FREE ACCESS
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    Graft copolymerization of methacryloyl-L-glutamic acid (M-Glu) and methacryloyl-L-diethyl-glutamate [M-Glu- (OEt) 2] onto natural rubber was inverstigated using benzoyl peroxide (BPO) as radical initiator under various conditions.
    Graft copolymerization of M-Glu : 1) As a polymerization solvent a mixture of toluene and dioxane with the composition of 2 : 1 to 3 : 1 by volume was suitable. 2) The curve of the graft efficiency against the BPO concentration had a maximum. 3) The higher the concentrations of rubber and monomer, the better graft results were obtained. 4) The appropriate polymerization temperature was 80 to 100 °C.
    Graft copolymerization of M-Glu- (OEt) 2 : 1) The curves for the degree of grafting and graft efficiency against the BPO concentration had maxima. 2) The degree of grafting increased rapidly with an increasing ratio of monomer to rubber. 3) The optimum polymerization temperature was 100 °C.
    Some physico-chemical properties of the graft copolymer were determined and discussed.
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  • DIRECT ATTACK OF OXYGEN ON AMINE ANTIOXIDANTS
    A STUDY ON DETERIORATION AND STABILITY OF BR AND IR VI
    M. Tanaka, T. Sawata, K. Tate, H. Yoshino
    1971 Volume 44 Issue 11 Pages 929-936
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.929
    JOURNAL FREE ACCESS
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    Reaetions between amine base antioxidants and oxygen have been Investigated with the following results :
    (1) The antioxidants were thermally decomposed in the atmosphere and in an inert gas. Comparison of thermograms obtained thereby shows that in the atmosphere the antioxidants are for the greater part decomposed with oxidation, but in the inert gas the majority of them vaporized except some which were decomposed.
    (2) Relatively low-temperature behaviors of antioxidants were investigated with respect to the mplecular weight, infrared-, ultraviolet absorption spectra and refractivity. It is surmised that certain changes occurred in ANA, PBNA, DPPD, etc., but no formation of a dimer was recognized.
    (3) The antioxidants thus oxidized were added to rubber and their effects on rubber were evaluated in terms of viscosity change due to oxidation in the rubber solutions. Most of the antioxidants remained practically unchanged, except PBNA which exhibited a fast drop in viscosity. From the above results, it is known that most of the antioxidants exhibit no great change, except PBNA, which is likely to promote oxidation of rubber.
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  • A NOVEL APPARATUS FOR TESTING TORSIONAL PROPERTIES OF PLASTICS IN STATICS AND DYNAMIC CONDITIONS
    F. Ohishi, H. Matsushita, K. Minabe
    1971 Volume 44 Issue 11 Pages 937-941
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.937
    JOURNAL FREE ACCESS
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    A torsional testing apparatus with a capacity and sensitivity specially designed for plastics was constructed in which a small rod specimen was clamped with a pair of drill chucks. One was fixed through a torsion bar to the machine frame. The other could impose a torsional load on the specimen in four differrent ways : at a constant loading rate for measuring stress-strain behavior, at a constant load for creep testing, at a constant torsional angle for stress relaxation testing, and at on alternating angle for fatigue test. In addition, it was equipped with an ultraviolet lamp for irradiation, a device for trickling liquid chemicals on the specimen, and an air bath for temperature control. Some results with powcarbonate specimens are presented to demonstrate the practicability of the apparatus.
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  • MODIFIED BY ADDITIONAL USE OF LOW MOLECULAR WEIGHT GLYCOLS
    A STUDY ON MODIFICATION OF POLYURETHANE (I)
    H. Okamoto, S. Inagaki
    1971 Volume 44 Issue 11 Pages 942-948
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.942
    JOURNAL FREE ACCESS
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    A new one-shot method for the preparation of urethane elastomers has been developed using the reaction of glycols and diisocyanates in the presence of triethylene diamine together with epoxy resin as a polyaddition catalyst.
    As the glycol component, binary mixtures of polypropylene glycol and low molecular weight glycols were used.
    In this way, elastomers of high moduli can be prepared by curing at 70 °C without preliminary treatment.
    Ethylene glycol causes an increase in the amount of diisocyanate to be incorporated and as a result, the moduli of the elastomers are much enhanced through the formation of isocyanurate linkage or hydrogen bonding.
    The presence of epoxy resin may promote the catalytic action of triethylene diamine.
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  • Erratum
    1971 Volume 44 Issue 11 Pages 948
    Published: 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.11_948
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1971 Volume 44 Issue 11 Pages 949-950
    Published: November 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.949
    JOURNAL RESTRICTED ACCESS
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