All issues
Predecessor
Volume 66, Issue 10
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese], [in Japanese]1993 Volume 66 Issue 10 Pages 695-705
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (1373K) -
[in Japanese]1993 Volume 66 Issue 10 Pages 706-719
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (1347K) -
[in Japanese]1993 Volume 66 Issue 10 Pages 720-721
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (272K) -
1993 Volume 66 Issue 10 Pages 722-723
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (548K) -
EFFECTS OF FATTY ACID AMIDESOsamu SHIMOMURA, Yoshio TAKAI, Masami SAWADA, Shigetoshi TAKAHASHI, Ku ...1993 Volume 66 Issue 10 Pages 724-730
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe addition of behenamide provides a high degree of reinforcing effects on mechanical properties for the poly (vinyl chloride)-talc binary composite system. The optimal quantities of behenamide have been examined. At 0.3phr behenamide content, the yield strength for the PVC-talc (40 phr) system shows 14MPa increment.
The addition of acetamide or N, N-dimethylbehenamide does not provide such reinforcing effects on mechanical properties for the PVC-talc binary composite system. It is considered that the N-H protons and the long alkyl chain of behenamide play important roles to the increasing yield strength.
The effectiveness of the addition of aliphatic amide with long alkyl chain has also been tested for the PE-talc, plasticizing PVC-talc, and PU-talc binary systems. PE-talc system does not show any increasing mechanical properties, whereas plasticizing PVC-talc and PU-talc systems, in contrast, show a high degree of increasing mechanical property such as moduli.View full abstractDownload PDF (713K) -
Kunio Mori, Yoshiyuki Oishi, Hidetoshi Hirahara, Hitoshi Harada1993 Volume 66 Issue 10 Pages 731-740
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn order to improve the surface properties of fluorinated rubber (FKM), the surface treatment of FKM vulcanizates was investigated about the aqueous solution of 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol (DB), NaOH and tetrabutylammonium bromide (W method) and in the acetone solution of ammonium salt of DB (A method).
In W method, after immersing FKM vulcanizates at 50-95°C for 15-60min into the aqueous solution, the surface treatment was carried out by post-curing at 200°C for 20hrs. DB weight and depth reacted were influenced by the kind and amount of reagents, the concentration, temperature and time. The diffusion of reagents to FKM vulcanizates was a rate determining step for a treating rate.
In A method, after adhering the ammonium salt of DB on FKM vulcanizates by immersion, treating reaction was carried out by heating the vulcanizates at 200°C for 20hrs.
The W and A methods decreased the friction coefficient of FKM vulcanizates and the fixing strength between the FKM vulcanizates and stainless steel plates. A method gave better surface properties for friction and fixing to FKM vulcanizates than W method. W method was easy for the procurement of reagents.View full abstractDownload PDF (1188K) -
ISOPRENE BLOCK COPOLYMER COMPOSITESAsahiro NAGATANI, Mari ISHIHARA, Masaru MORI, Jojiro OKUMURA, Koichi Y ...1993 Volume 66 Issue 10 Pages 741-747
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSShort fiber/thermoplastic elastomer composites having anisotropy were prepared with hydrogenated styrene-isoprene block copolymer (SEPS) and poly (ethyrene terephthalate) (PET) short fiber (3-10mm). Tensile properties of composites were independent of mixing temperature, but the dispersion of PET fibers in SEPS was improved with decreasing the mixing temperature. In the fiber direction, tensile strength and modulus of composites increased with increasing the fiber content, and did not with increasing the fiber length. In the case of composites with PET fiber treated with hydrogenated styrene-isoprene diblock copolymer modified with acid, tensile strength in the fiber direction increased with increasing the fiber length (5mm>). Furtheremore, it was found that E′ increased with increasing the fiber content, and the heat-resistance of composites was better than that of SEPS.View full abstractDownload PDF (1137K) -
Tadaoki OKUMOTO, Hidenobu HONDA, Kiyomitu TERASHIMA1993 Volume 66 Issue 10 Pages 748-755
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSEthylene-Propylene-Diene Rubber (EPDM) has superior physical properties on heat resistance and weatherbility because of olefinic polymer chain without double bonds. Therefore, EPDM has been used for automotive rubber parts in stead of styrene-butadiene rubber (SBR). On the other hand, EPDM is inferior to physical strength and low temperature property comparing with SBR. Generally, increase of ethylene content in EPDM improves physical strength, but the compression set at low temperature is not so good. In this report, in order to improve both of rubber strength and compression set at low temperature without reducing the superior physical property at high temperature, the composition distribution was studied. By the increase of diene content, the compression set at high temperature and physical strength were improved. By uniforming the distribution of ethylene unit and decreasing the distribution of ethylene length, the compression set at low temperature was not affected by the increase of ethylene content in EPDM. This peroxide cured EPDM has superior physical properties on strength, low and high temperature compression set and superior sealing properties. The automotive piston seal made of this EPDM shows the good product performance.View full abstractDownload PDF (820K) -
Yoshito OHTAKE, Tomoko KOBAYASHI, Shigeki ITOH, Hitoshi ASABE, Masuo Y ...1993 Volume 66 Issue 10 Pages 756-762
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe degradation of the thick parts of a LDPE container which was confirmed to have been buried under bioactive soil for 32-37 years was investigated by the molecular weight measurements and reflectance FT-IR spectroscopy of the surface. The depth profile of the degradation state was also investigated. The number averaged molecular weight of PE just under the surface was about one half of that of the internal part. This is the first case where the decrease of the molecular weight of the LDPE was directly observed under the oxidation promoted by the bioactive circumstance. The surface FT-IR spectra demonstrated the presence of carbon-carbon double bonds which are characteristic of the LDPE degraded under bioactive condition. The depth profile of microscopic FT-IR and the distribution of oxygen atoms observed by EPMA line analyses showed that the oxidation extended to as far as 40μm depth from the surface. These results suggested that even the high molecular weight LDPE could biodegrade as opposed to the generally accepted opinion.View full abstractDownload PDF (815K) -
Naruhisa MONDEN, Takashi AKASAKA1993 Volume 66 Issue 10 Pages 763-768
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSWe intend to investigate the end constraint effect of the belt structure having a finite length, which is a biased laminate of two unidirectional cord reinforced rubber strips, under axial tension on the stress distributions and the coupled deformations, by using the three dimensional finite element method. These results for four numerical examples of the belt structure with end constraints, are compared with the theoretical results for the belt with an infinite length.
It is shown that the end constraint reduces the concentration of the interply shearing stress at the free belt edges, and the area influenced by the end constraints depends only on the bias angle of the laminate, but not on its length. Furthermore, it is noted that the stress distributions of the belt structures with the end constraints differ markedly from these of the belt without end constraints.View full abstractDownload PDF (460K) -
[in Japanese]1993 Volume 66 Issue 10 Pages 769-770
Published: 1993
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (234K)
- |<
- <
- 1
- >
- >|