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Predecessor
Volume 63, Issue 12
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1990 Volume 63 Issue 12 Pages 727-730
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (448K) -
[in Japanese]1990 Volume 63 Issue 12 Pages 731-737
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (609K) -
[in Japanese], [in Japanese], [in Japanese]1990 Volume 63 Issue 12 Pages 738-748
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (812K) -
[in Japanese]1990 Volume 63 Issue 12 Pages 749-752
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (453K) -
Masayuki ITO, Sohei OKADA1990 Volume 63 Issue 12 Pages 753-759
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe changes in dielectric properties of elastomer by irradiation were studied for the following three cases. The sample used is tetrafluoroethylene-propylene copolymer. Case 1) The network concentration decreases and the concentration of C=O increases with increasing dose.
It was found out that G values are 1.38 for scission, 1.28 for cross-linking and 1.28 for C=O production in polymer when the irradiation is performed by γ ray at room temperature.
Both the dielectric the increment and relaxation time increase with increasing dose under this condition.
Case 2) The certain amount of C=O is added to the samples, which have different original cross-linking densities, by irradiation of y ray (0.2MGy) at 100°C.
The effect of the network concentration is small on changes in the dielectric increment by the irradiation. On the other hand, the relaxation time increases with increasing network concentration.
Case 3) Samples keep almost the same network concentration but concentration of C=O increases with increasing dose.
The operation of alternating irradiation of γ ray (60kGy) at 100°C and irradiation of electron beam (40kGy) keeps the network concentration constant.
The dielectri increment increases with the repetition of the operation. The relaxation time increases with increasing the repetition of the operation although the network concentration is kept constant.
The paper concludes as follows from the results mentioned above and a general idea, i.e. scission reaction of molecular chain occurs randomly during irradiation.
The dielectrc increment increases with the concentration of C=O which was produced by irradiation. The relaxation time does not depend on the network concentration but depends on the length of the free ends of the network chains which is assumed to have carboxyl and/or carbonyl groups.View full abstractDownload PDF (4682K) -
Jun-ichi KUDO, Katsumi USUI1990 Volume 63 Issue 12 Pages 760-767
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSAn additive consisting of hydroaromatics produced from decrystallized anthracene oil was applied as a deterioration inhibitor to NR and SBR after confirmation of its hydrogen donating ability. This was based on the facts that hydroaromatics (hydrogen donating hydrocarbons) are widely used in such processes as coal liquefaction and heavy oil upgrading, serving as radical scavengers to prevent coke formation, and also, that they are effective to inhibit the deterioration of oil products7)8) and other hydrocarbon products (papers in preparation) by various deteriorating sources.
It was found that this additive was almost as effective as the commercial amine type inhibitor. In addition, it has such characteristics of pure hydrocarbons as decreasing Mooney viscosities (the possibility to serve as a softening oil can be considered) and prevention of contamination.
Judging from the results, it is considered that this type of additive has the possibility to be used by improving physical properties.View full abstractDownload PDF (545K) -
Kunihiko FUJIMOTO, Masanobu ODA, Yoshihiro UCHIYAMA1990 Volume 63 Issue 12 Pages 768-777
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn the course of tensile loading, an investigation was carried out the fracture behaviors using multi-layered angle ply FRR sheets consisted of carbon black filled rubber matrix and 6-nylon cords.
As the result of this investigation, it was shown that the fracture behaviors could be classified six fracture modes: the fracture of physical bonds, the fracture of fibers, the fracture of fiber-matrix interface, the fracture of matrix, the fracture of interlaminar matrix by interlaminar shearing stress, and the fracture of interlaminar fiber-interface by interlaminar shearing stress. It should be stressed that these tensile fracture modes were deeply concerned with bias angle. In the case of bias angle smaller than 30 degrees, the fracture of fibers, the fracture of fiber-matrix interface, and the fracture of matrix were prominant, while in the case of bias angle larger than 30 degrees, the fracture of fiber-matrix interface and the fracture of matrix were prominant.View full abstractDownload PDF (844K) -
Kunihiko FUJIMOTO, Yoshihiro UCHIYAMA1990 Volume 63 Issue 12 Pages 778-782
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSAs for the eight-layer angle ply FRR composed of carbon black-filled rubber and 6-nylon cords as the base materials, the behavior of generating AE wave and the form of fractures in the process of fatigue were observed, and the fatigue life curves were investigated.
It was elucidated that demarcating stress K≈0.35, in the bias angle θ<35°, the transition from fiber breaking and fiber-matrix interface breaking to fiber breaking and matrix breaking, and in θ>35°, that from fiber-matrix interface breaking to matrix breaking occurred, and the fatigue life curve were composed of respective two curves.View full abstractDownload PDF (438K) -
[in Japanese]1990 Volume 63 Issue 12 Pages 783-784
Published: 1990
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (226K)
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