NIPPON GOMU KYOKAISHI
Print ISSN : 0029-022X
Search
Advanced search
OR
Browse
Search
Volume 48, Issue 12
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    [in Japanese], [in Japanese]
    1975Volume 48Issue 12 Pages 729-746
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.729
    JOURNAL FREE ACCESS
    Download PDF (1761K)
  • [title in Japanese]
    J. F. Smith, [in Japanese]
    1975Volume 48Issue 12 Pages 747-754
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.747
    JOURNAL FREE ACCESS
    Download PDF (577K)
  • [title in Japanese]
    [in Japanese], [in Japanese]
    1975Volume 48Issue 12 Pages 755-767
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.755
    JOURNAL FREE ACCESS
    Download PDF (850K)
  • MODIFICATION OF SYNTHETIC RUBBERS (V)
    COMPOUNDING EFFECT OF TELOMERS CONTAINING HALOGEN AND CARBOXYL GROUP FOR SYNTHETIC RUBBERS
    Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Hitoshi TOMOKIYO
    1975Volume 48Issue 12 Pages 768-774
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.768
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The telomers containing halogen atoms (chlorine or bromine) and carboxyl groups on both of their chain ends were prepared by the radical telomerization of styrene and various halogeno-acetic acids. The compounding effects of them on EPDM, SBR, NBR and BR were examined.
    For EPDM and SBR, the compounding processability was markedly improved by the addition of these telomers. The tensile, properties of vulcanized rubber compounded with the telomers were also improved. The best improvement in the properties of vulcanizates was obtained when the telomer compounding levels were from 10 to 15phr and the degrees of polymerization of these telomers were from 5 to 7, respectively.
    Moreover, the heat resistance and adhesion properties of vulcanizates were also improved by the addition of these telomers. These effects may result from the reaction between rubber molecule and telomer.
    View full abstract
    Download PDF (392K)
  • FATIGUE OF RUBBER (I)
    FATIGUE OF NR GUM VULCANIZATES UNDER REPEATED LARGE EXTENSIONS
    Satoru OHTO, Minoru UEDA, Shinji MURAKAMI
    1975Volume 48Issue 12 Pages 775-782
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.775
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Influence of the mechanical and chemical factors on stress changing and fatigue life (the number of stretching cycles to failure) in NR gum vulcanizates was studied under repeated large extensions in air.
    It was found that, under constant repeated large extensions at 20°C, the degree of stress changing and the magnitude of fatigue life in rubbers were influenced by the chemical crosslink structure, the crosslink density, and the degree of extension. Under repeated extensions of 500% at the temperature of 80°C or more, the test samples showed remarkable stress softening (which we call chemical stress softening) due to thermal oxidation of rubbers.
    The relationship among fatigue life (F), ultimate elongation (εb), and repeated extension (ε) of NR gum vulcanizates at 20°C was as follows;
    F=A(εb-ε)n
    where n and A were the characteristic parameters, and the value on n was 4.0 to 4.5.
    View full abstract
    Download PDF (521K)
  • [title in Japanese]
    [in Japanese]
    1975Volume 48Issue 12 Pages 783-784
    Published: 1975
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.48.783
    JOURNAL RESTRICTED ACCESS
    Download PDF (217K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top