NIPPON GOMU KYOKAISHI
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Volume 66, Issue 11
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 66 Issue 11 Pages 775-782
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.775
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 66 Issue 11 Pages 783-794
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.783
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 66 Issue 11 Pages 795-797
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.795
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1993 Volume 66 Issue 11 Pages 798-799
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.798
    JOURNAL FREE ACCESS
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  • MORPHOLOGY OF POLYMER BLENDS USING FLUOLOPOLYMER
    Eiji YASUI, Hitoshi YOSHIKAWA, Shigeaki TAKAMATSU, Akio SATO, Ichiro I ...
    1993 Volume 66 Issue 11 Pages 800-811
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.800
    JOURNAL FREE ACCESS
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    A number of studies of polymer blends using poly (vinylidene-fluoride) (PVF2) and poly (methyl-methacrylate) (PMMA) have been reported up to now. This is because PVF2 is known to be miscible with PMMA at low temperature. In this paper, we studied the miscibility and crystallization of polymer blends using three kinds of polyacrylic ester with PVF2.
    Poly (methyl acrylate) was found to be miscible with PVF2. On the other hand poly (butyl-acrylate) was found to be immiscible. (liquid-liquid phase separation)
    The rate parameters showed that crystallization rate decreases as polyacrylicester content increases and the crystallization temperature Tc increases. The temperature dependence was successfully described by the Hoffman-Lauritzen theory.
    It was also found that the strength characteristics and the dielectric constat of polymer blend prepared by twinscrew extruder largely depends on the crystallinity.
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  • PREPARATION AND PROPERTIES OF 1-CHLORO-1, 3-BUTADIENE-STYLENE-1, 3-BUTADIENE TERPOLYMER AND ITS HYDROLYZED PRODUCT
    Katsumi SANDO, Shinzo YAMASHITA, Shinzo KOHJIYA
    1993 Volume 66 Issue 11 Pages 812-821
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.812
    JOURNAL FREE ACCESS
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    1-Chloro-butadiene-styrene-butadiene terpolymer (CB-SBR) was prepared by emulsion polymerization at 5°C. Thus synthesized CB-SBR was hydrolyzed by heating the latex under alkaline conditions to afford a novel styrene-butadiene rubber carrying OH groups (HCB-SBR). Both CB-SBR and HCB-SBR showed much better processability on a two- roll mill than 1-chloro-butadiene-butadiene copolymer (CB-BR). The new rubbers were compounded with sulfur(S) or sulfur-diisocyanate(SI) as curing agent to prepare the vulcanizares. The crosslinking by S cure system were faster than that of commercial SBR, and HCB-SBR compounded with SI system showed the fastest cure rate. Tensile strength ( TB) of the carbon black stock vulcanizates of CB-SBR cured with S or SI system was 19.6 or 20.1 MPa, respectively. These values are higher than those of CB-BR (12.1 and 13.6 MPa), and almost equal to that of SBR vulcanizate with S system (19.1 MPa). On the other hand, HCB-SBR vulcanizate with SI system displayed the highest TB (25.6 MPa), which also showed better anti-aging properties than CB-SBR ones. Analyses of crosslinking structure revealed that the polysulfide bond ratio was higher for HCB-SBR vulcanizates with SI cure system than that for the vulcanizate with S system. This finding suggest that the vulcanizate with SI cure system is expected to show higher TB and heat aging resistance and lower compression set than that of the former by decreasing polysulfide bond ratio by optimizing the cure condition.
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  • PTC PROPERTY IN HEAT-TREATMENT PROCESS OF ISOTACTIC POLYPROPYLENE FILLED WITH CARBON BLACK
    Chifei WU, Shigeo ASAI, Masao SUMITA, Toshihide KAWACHI, Ikuo KANEKO
    1993 Volume 66 Issue 11 Pages 822-829
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.822
    JOURNAL FREE ACCESS
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    It has been well-known that the electrical resistivity of conductive particles filled insulating crystalline polymer composites shows a large positive temperature coefficient (PTC) below the melting temperature of the matrix polymers and a rapid decrease above it. This PTC property is decided by the degree of dispersion of fillers in matrix and the thermal expansion of polymers. Here the change of PTC property, microstructure of matrix polymers and the dispersion state of fillers in heat-treatment process were investigated, and the relationship among them was discoursed. The PTC intensity (logarithmic ratio of electrical conductivity at room and at melting temperature) increases with annealing temperature up to 120°C. In the range of annealing temperature 120-155°C, the electrical conductivity at room temperature and the PTC peak temperature increases, but the PTC intensity decreases. The former is due to the increase in the matrix polymer crystallinity accompanied with a transformation of the smectic phase into the monoclinic phase, the latter is due to the agglomeration of fillers in the partially melting process at annealing temperature more than 120°C. This agglomeration of fillers was confirmed through the measurement of the surface areas of fillers in polymers, and of time dependence of quenched samples at various temperature, and scanning electron microscopy observation.
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  • STRUCTURAL ANALYSIS OF HIGH STRENGTH HNBR/ZDMA COMPOSITES
    Akimasa NOMURA, Jin TAKANO, Akinobu TOYODA, Takaomi SAITO
    1993 Volume 66 Issue 11 Pages 830-838
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.830
    JOURNAL FREE ACCESS
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    The maximum tensile strength of carbon black reinforced hydrogenated nitrile rubber (HNBR) vulcanizates that can be achieved is about 30MPa. A newly developed composite of HNBR/Zinc Dimethacrylate (ZDMA) has a tensile strength of 55Mpa when vulcanized with a peroxide.
    During this curing process, in situ polymerization of the ZDMA takes place, forming a micro-network structure that was observed by an electronmicroscopic examination of the reaction.
    The network micro structure consisted of a continuous phase 20nm wide band formed by the agglomeration of primary particles of 2nm diameter created during the polymerization. This micro structure formation, which is smaller than the structure of carbon black, is postulated to be the reason for the very high tensile strength that is achieved with HNBR/ZDMA.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1993 Volume 66 Issue 11 Pages 839-842
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.839
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 66 Issue 11 Pages 843-844
    Published: 1993
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.66.843
    JOURNAL RESTRICTED ACCESS
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