NIPPON GOMU KYOKAISHI
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Volume 68, Issue 11
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 68 Issue 11 Pages 761-766
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.761
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1995 Volume 68 Issue 11 Pages 767-774
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.767
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 68 Issue 11 Pages 775-776
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.775
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1995 Volume 68 Issue 11 Pages 777-785
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.777
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1995 Volume 68 Issue 11 Pages 786-787
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.786
    JOURNAL FREE ACCESS
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  • REDUCTION OF RESIDUAL N-BUTYL ACRYLATE SENSITIZER IN RADIATION VULCANIZED NATURAL RUBBER LATEX
    Chunlei Wang, Fumio YOSHII, Kenichiro HYAKUTAKE, Keizo MAKUUCHI
    1995 Volume 68 Issue 11 Pages 788-793
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.788
    JOURNAL FREE ACCESS
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    Radiation vulcanization of natural rubber latex needs n-butyl acrylate (n-BA) to lessen required irradiation dose. Considerable amount of n-BA remains in the latex after the completion of radiation vulcanization and tends to pollute the working environment in a dipping factory. A study has been carried out to reduce the residual n-BA after the radiation vulcanization. About 40% of added n-BA was found in the latex after irradiation to 20kGy. Hydrolysis of n-BA was effective for reduction of the residual n-BA in the latex. No n-BA was found in the latex when the latex was stored for 4 weeks at room temperature due to its hydrolysis. Heating of the latex was effective to accelerate the rate of hydrolysis of n-BA. Almost all of n-BA in the latex was hydrolyzed when the latex was heated for 4 hours at 80°C. Tensile strength of the latex films slightly decreased by heating treatment of the latex, but gradually recovered as storage time extended. Low viscosity was attained by the heat treatment of the latex.
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  • STUDY ON THE DEGREE OF TEMPERATURE DEPENDENCE OF THE LAMBOURN ABRASION
    STUDY ON THE LAMBOURN ABRASION OF RUBBER (PRAT 2)
    Kenhachi MITSUHASHI, Hiroyuki KAIDO, Kazuyuki KABE, Kunihiko FUJIMOTO, ...
    1995 Volume 68 Issue 11 Pages 794-801
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.794
    JOURNAL FREE ACCESS
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    Temperature dependence curve of abrasion volume, abrasion breaking phase, construction and physical property data of cured SBR containing carbon black shows transition point and is devided into low (I) and high (II) temperature regions.
    (1) abrasion in the low temperature region is caused by tensile break in the abrasion process of rubber molecular chain of rubber-state adhered to contact surface, and is controlled by the number of rubber molecular chain of rubber-state and suraface adhesion force.
    Besies, abrasion volume, A(I), is represented by the following exponential function of abrasion coefficient, μ(I).
    A(I)=exp{a•μ(I)+b}
    (2) abrasion in the high temperature region is caused by tearing separation of rubber debris at the tip of contact area with the growth of micro crack generated by internal force in process of abrasion, and is controlled by carbon black volume, quasi-glassy state volume and density of ruber molecular chain of crosslinked rubber molecules phase.
    Besides, abrasion volume, A(II), is represented by the following exponential function of Trousers tear strength, Tr(II).
    A(II)=exp{a•Tr(II)+b}
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  • Mechanical Properties of PVC-Talc Binary Composite System
    Effects of Acid Amide on Yield Strength
    Osamu SHIMOMURA, Toshihiko SATO, Hiroshi HONJO, Kunio GOTO
    1995 Volume 68 Issue 11 Pages 802-807
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.802
    JOURNAL FREE ACCESS
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    The addition effects of several aliphatic amides with the different alkyl chains has been tested for the poly (vinyl chloride)-talc binary composite system. This system showed the increasing yield strength with the increasing carbon number of the amide added.
    The addition effects of the coupling agents have been also examined for this systems. [3-(2-Aminoethyl) aminopropyl] trimethoxysilane and (3-mercaptopropyl) trimethoxysilane provides the largest reinforcing effect on yield strength.
    Accordingly, the addition effects of N-acetylethylenediamine or N-acetylsysteamine has been examined. At 1.0phr content of N-acetylcysteamine, the yield strength for the PVC-talc (40phr) system showed 8MPa increment.
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  • STUDIES ON BIO-DEGRADATION OF LDPE-OBSERVATION OF LDPE FILMS SCATTERED IN AGRICULTURAL FIELDS OR IN GARDEN SOIL
    Yoshito OHTAKE, Tomoko KOBAYASHI, Shigeki ITOH, Hitoshi ASABE, Masuo Y ...
    1995 Volume 68 Issue 11 Pages 808-813
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.808
    JOURNAL FREE ACCESS
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    Agricultural mulch films and package films scattered in fields or in garden soil were observed by an optical microscope after staining with lactophenol cotton blue as well as by SEM and FT-IR microscope.
    The part of these samples which was concealed in soil was whitened in appearance. We observed a lot of small holes passing through the film. The microscope FT-IR analysis showed the existence of-C=C-double bond (1640cm-1) around the surface of the whitened part. Significant levels of hydroperoxide and hydroxide absorption bands were also observed. Optical microscope observations of films stained with lactophenol cotten blue revealed that the bio-activity of the film surface was especially high in the vicinity of small holes. We found several colonies of microbes by optical microscope with cotton blue staining as well as by SEM. We concluded that the bio-degradation of thin LDPE films in soil was unexpectedly fast because of the synergistic action of oxidative and/or photo-oxidative degradation on biological activity which is probably due to the increasing hydrophilicity of the film surface.
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  • ULTRA-HIGH EXTENSIBILITY OF DESWOLLEN POLYSILOXANE NETWORKS
    Kenji URAYAMA, Yuko IKEDA, Shinzo KOHJIYA
    1995 Volume 68 Issue 11 Pages 814-817
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.814
    JOURNAL FREE ACCESS
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    The high extensibility of deswollen polysiloxane (PDMS) network prepared at ca. 9% solution has been demonstrated. PDMS was crosslinked by hydrosilylation reaction of vinyl-terminated PDMS by tetrakisdimethylsiloxysilane in toluene. The fully deswollen network was obtained by removing toluene from the swollen PDMS network. The uniaxial elongation of the deswollen PDMS network prepared at 9% solution was carried out, and the elongation at break reached ca. 1700%. This high extensibility originates from the two main factors: no or negligible amount of trapped entanglements in the system due to the low preparation concentration of the prepolymer in toluene; the reduction of end-to-end distance of network chains on deswelling. The theoretical limit for the extensibility has been evaluated to be ca. 1900% by estimating the amount of trapped entanglements and the end-to-end distance of network chains at deswollen state. The theoretical value for the elongation at break explains well the extensibility obtained experimentally.
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  • Methods of Sample Preparation for Evaluation of Carbon Black in Rubber
    1995 Volume 68 Issue 11 Pages 818-827
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.818
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 68 Issue 11 Pages 828-829
    Published: 1995
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.68.828
    JOURNAL RESTRICTED ACCESS
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