NIPPON GOMU KYOKAISHI
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Volume 70, Issue 9
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 9 Pages 477-484
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.477
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 9 Pages 485-490
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.485
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1997 Volume 70 Issue 9 Pages 491-498
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.491
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 9 Pages 499-508
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.499
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1997 Volume 70 Issue 9 Pages 509-513
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.509
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 9 Pages 514-518
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.514
    JOURNAL FREE ACCESS
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  • SYNTHESIS OF HYDROXY- AND ALDEHYDE-TERMINATED POLY (METHYL VINYL ETHER)S
    Tamotsu HASHIMOTO, Hideaki AIZAWA, Toshiyuki KODAIRA
    1997 Volume 70 Issue 9 Pages 519-524
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.519
    JOURNAL FREE ACCESS
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    Synthesis of hydroxy- and aldehyde-terminated poly(methyl vinyl ether)s based on cationic polymerization was investigated. Methyl vinyl ether was polymerized with the initiating system consisting of CH3 CHCl-O-CH2 CH2-OCOCH3 (1; the hydrogen chloride adduct of 2-vinyloxyethyl acetate) and ZnCl2 in CH2Cl2 at -40°C and the reaction was terminated by adding water. The obtained polymers had a “head” (α-end) acetoxy group originating from the initiator and a “tail” (ω-end) aldehyde group formed by the reaction of the propagating end with water. However, chain transfer reactions took place during the polymerization and hence the end-functionalities of both the acetoxy and aldehyde terminals were less than unity. Simultaneous transformation of the acetoxy and aldehyde terminals into hydroxy groups was carried out by the reduction with LiALH4.
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  • Improvement in Properties of Rubbers by Latex Blend(1). Synthesis of Functional Elastic Gels and Blend with FKM Latex
    Eisuke YAMADA, Koji SATO, Shinji INAGAKI
    1997 Volume 70 Issue 9 Pages 525-532
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.525
    JOURNAL FREE ACCESS
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    Elastic emulsion gels with high three dimensional cross-links were prepared by the emulsion polymerization of n-butyl acrylate and divinylbenzene as cross-linking agents. Furthermore, concidering the vulcanization of synthetic rubbers, an allyl methacrylate was used as the third component. Emulsion gels obtained showed that the avrage particle sizes are about 0.1μm and particle size distributions are very narrow. By quantitative analysis of ethylenic double bonds in the surface layer of gels, it was found that they are proportinal to molar ratio of divinylbenzene. Rubber blends were prepared by the co-precipitation of the mixture of FKM latex and these emulsions.From the results of vulcanization curves, it was found that the rate of vulcanization did not appreciably changed and the values of final torque increased with increasing the blend ratio and the molar ratio of DVB. The moduli and tensile strngths of blend vulcanizates increased with increasing the amount and the cross-linking density of gels, but the elongations decreased. On the other hand, in the case of blending gels with allyl groups, moduli were appreciably unchanged but TB s were more improved than the FKM vulcanizate as a control. The decrease of the benzene swelling resistance was a little.
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 9 Pages 534-535
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.534
    JOURNAL RESTRICTED ACCESS
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