NIPPON GOMU KYOKAISHI
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Volume 59, Issue 12
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1986 Volume 59 Issue 12 Pages 649-657
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.649
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 12 Pages 658-666
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.658
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 12 Pages 667-670
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.667
    JOURNAL FREE ACCESS
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  • STUDY ON ANISOTROPIC SURFACE FRACTURE ENERGIES OF PARTICLES REINFORCED RUBBER VULCANIZATES FATIGUED WITH THREE-DIMENSIONAL STRESSES
    Kunihiko FUJIMOTO, Naoto MIFUNE, Tadahiro UEKI, Akihiro MAEHARA
    1986 Volume 59 Issue 12 Pages 671-675
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.671
    JOURNAL FREE ACCESS
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    In this paper is investigated the relationship between structures of carbon black filled NR vulcanizates, forming anisotropic layer structures consisting of carbon black aggregates and rubber molecular chains, reported in previous papers1)2), and some data on fracture surface energies along the directions of principal stresses and on the degrees of swelling. Fracture surface energies and the degrees of swelling are changed with the formation of anisotropic layer structures. The formation of anisotropic layer structures which are caused by fatigue due to three-dimensional stresses is initiated from early state of fatigue with a break down of weak physical bonds between rubber molecular chains.
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  • LOW TEMPERATURE TRANSITIONS IN POLY (OXYPROPYLENE) TRIOL POLYURETHANES
    Mutsuhisa FURUKAWA, Huidi YANG, Taketoshi SANA, Tetsuo YOKOYAMA
    1986 Volume 59 Issue 12 Pages 676-684
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.676
    JOURNAL FREE ACCESS
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    Polyurethane networks were prepared from poly (oxypropylene) triol (PPT-1000, -250, and -6000) and 2, 4-tolylenediisocyanate as a model network. The α-dispersions observed in the dynamic mechanical properties of the polyurethanes were associated with glass transition. The dispersion range of loss modulus in α-dispersion was expanded to a low temperature side by increasing the concentration of polar groups. However, the peak intensity of loss modulus peak was not changed. These results differed from those of diol-cured polyurethanes. Relation between the temperature of loss modulus peak, Tα(E"max), and the concentration of polar groups (mol/g) had linear correlation. Tα(°C)=-71.7+2.7×104 {[Urethane]+3.8[Allophanate]}. The contribution of glycerol concentration as a crosslinking site to Tα(E"max) differed from that of allophanate concentration. The β-dispersion was associated with the motions of hydroxyl-terminated poly (oxypropylene) side chains and/or the motion of crosslinking sites (glycerol units and allophanate units). The γ-dispersion (-130--110°C) was associated with a complex relaxation including the local motion of polyether segments and the rotation of methyl side groups.
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  • BLOOD COMPATIBILITY AND SOME PROPERTIES OF SEGMENTED POLY-URETHANEUREA BASED ON PEOPTHF-PEO TRIBLOCK COPOLYETHER
    Shinzo KOHJIYA, Yuko IKEDA, Shinzo YAMASHITA, Kazuko HAYASHI, Noboru Y ...
    1986 Volume 59 Issue 12 Pages 685-691
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.685
    JOURNAL FREE ACCESS
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    In order to prepare a novel highly elastic biomaterial, a ABA-type triblock copolyether where A was polyethylene oxide (PEO) and B was poly (tetrahydrofuran) was synthesized from hydroxyl-terminated poly(tetrahydrofuran) (HT-PT). Segmented polyurethaneurea was obtained from this copolyether by the prepolymer method together with 4, 4′-diphenylmethane diisocyanate and ethylene diamine. Blood compatibility tests both in vitro (the Lee-White coagulation test and micrographic observation of platelet adhesion) and in vivo (short-term implantation for canine peripheral veins) showed that SEUUs were superior in antithrombogenicity to SPUU, which was a segmented polyurethaneurea synthesized from HT-PT. Both SEUUs and SPUU were highly elastic materials with high tensile strength. Especially, the SEUU having EO content of 33mol% displayed a distinctive mechanical properties, i.e., very low moduli and high elongation with high tensile strength. The apparent network-chain density by use of the Mooney-Rivlin equation was of the order of 10-4mol/cm3, and the c2 term was found to change with EO content in SEUU. By stress relaxation tests in normal saline solution at 37°C, it was found that the relaxation decreased with the increase of EO content. These findings may suggest that the microphase separation in the polyurethaneureas is much influenced by the introduction of PEO segments in them.
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 12 Pages 692-693
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.692
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 12 Pages 694-695
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.694
    JOURNAL RESTRICTED ACCESS
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