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Volume 68, Issue 8
Displaying 1-11 of 11 articles from this issue
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[in Japanese]1995 Volume 68 Issue 8 Pages 509-516
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 8 Pages 517-522
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 8 Pages 523-529
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 8 Pages 530-538
Published: 1995
Released on J-STAGE: July 09, 2007
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1995 Volume 68 Issue 8 Pages 539-540
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (453K) -
[in Japanese]1995 Volume 68 Issue 8 Pages 541-543
Published: 1995
Released on J-STAGE: July 09, 2007
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NO. 3 REPORTTadashi UTSUNOMIYA, Kazuo NAITO, Hideo NAKAUCHI, Sakae INOUE1995 Volume 68 Issue 8 Pages 544-550
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn previous reports thiols were employed to analize the crosslinking structure of sulfure cured rubbers. This paper investigated the reaction mechanism of thiol compounds with sulfide crosslinks existing in a sulfur cured rubber. Mono, di, and poly sulfide compounds were used as models of sulfur crosslinks. Gas Chromatographic analysis was used to elucidate the reaction mechanisms. A primary thiol can disbonds both the poly and di crosslinks and the results coinsided with those obtained by LiAlH4. A secondary thiol cuts (exchanges) the polysulfide bondings rapidly, but the reaction rate to disulfide was found to be 1/200 comparing to that of polysulfide. It was found that these reaction must be carried out under an oxygen free condition.View full abstractDownload PDF (600K) -
Yoshito OHTAKE, Tomoko KOBAYASHI, Shigeki ITOH, Hitoshi ASABE, Masuo Y ...1995 Volume 68 Issue 8 Pages 551-558
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn the previous papers, we have elucidated that the low density polyethylene (LDPE) which has been considered to be non bio-degradable do degrade in bio-active soil. In this paper, we examined the effect of compounding agents to promote the degradation of LDPE in bio-active soil. We added dicmyl peroxide (DCP) to estimate the effect of the acceleration of simple thermal oxidation of LDPE. The addition of small amount of DCP was enough to accelerate the oxidation. In order to estimate the bio-degradability of practical LDPE compound, we added vegetable oil to starch filled LDPE. The effect of addition of DCP was also investigated for this compound by a long-term burial test in a bio-active soil. The synergism of the addition of the oil and DCP was remarkable. The tensile strength of the LDPE with DCP decreased much faster than the one without DCP. The promoted degradation of the LDPE compound was confirmed by the increase of the carbonyl bands in FT-IR analysis. In addition, photo-degradation of the LDPE with DCP remarkably progress.View full abstractDownload PDF (1148K) -
Hiroshi IIZUKA, Shinya TSUTSUMI, Kazumi WATANABE, Satoshi MASHIMO, Nob ...1995 Volume 68 Issue 8 Pages 559-566
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe deformation behaviour and the failure morphology of synchronous-belt cords were investigated to understand the failure mechanism of the synchronous belts. The cord used here was constructed by eleven stranded glass filaments which were made of six hundred glass filaments. The processing compound was RFL.
When the belt mated with a pulley, three types of deformation were initiated in the belt, i. e. bending, compressive and shearing deformations. The degree of bending deformation was expressed by using the curvature of cords. The authors proposed the simple measuring method of the curvature. The high curvature was initiated at the locations where the cords were largely failed in mortoring tests. The authors then carried out bending fatigue tests of cords. The failure mode observed was identical with the mode which was initiated in mortoring tests. Therefore, it is considered that the bending deformation is the most important factor to discuss the belt fatigue life.
Moreover, the authors performed three types of additional fatigue tests to study the failure mechanism of cords. The results show that the combined cycling of bending and straightening is the severest deformation for the initiation of cord failure.View full abstractDownload PDF (1230K) -
Study on the Lambourn abrasion of rubber (Part 1)Kenhachi MITSUHASHI, Hiroyuki KAIDO, Kazuyuki KABE, Kunihiko FUJIMOTO, ...1995 Volume 68 Issue 8 Pages 567-573
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSAs an evaluation method of tire abrasion, we have studied the degree of temperature dependence of rubber abrasion in the temperature range of -5-70°C using cured rubber samples composed of various carbon black and oil content with Lambourn abrasion tester. The test results were abtained as follows.
(1) Temperature dependence of abrasion loss in devided into two temperature ranges, low and high which is below and above 30°C, and it is affected by carbon clack and oil content. Furthermore, value concerning construction and physical properties, breaking pattern and breaking volume showed particular characterstics and transition phenomenon at 30°C.
(2) Temperature dependence of normalized severity energy represented by the ratio of severity energy to breaking energy is slightly correlated with that of abrasion loss. In order to represent abrasion loss, however, it is necessary to include factors formulated from breaking pattern and breaking volume.View full abstractDownload PDF (901K) -
[in Japanese]1995 Volume 68 Issue 8 Pages 574-575
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (310K)
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