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Predecessor
Volume 36, Issue 5
Displaying 1-10 of 10 articles from this issue
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THE OXIDATION POTENTIALS AND THE EFFECTS OF ANTIOXIDANTST. Kotani, S. Yamashita, J. Furukawa1963 Volume 36 Issue 5 Pages 441-445
Published: 1963
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSHalf wave oxidation potentials of antioxidants and some chemicals which belonged to amine derivatives were measured by using polarography. The potentials were related to the effects of these chemicals as antioxidants, and to the highest occupied energy level.
As the results, it was found that (1) chemicals were most effective as antioxidants when the half wave oxidation potentials existed in 0.3 to 0.5 volt, and that (2) the lower the potentials of anilin derivatives were, the more effective the chemicals were exponentially, and that (3) their potentials related linealy to the highest occupied energy levels of them.
From these results, electrons in amine derivatives were assumed to have an important point in these reactions. The first reaction between oxidized rubber molecule and antioxidants of amine derivatives may be electron transfer from the latter to the former.View full abstractDownload PDF (401K) -
OXIDATION POTENTIALS AND THE EFFECTS OF ANTIOZONANTST. Kotani, S. Yamashita, J. Furukawa1963 Volume 36 Issue 5 Pages 446-449
Published: 1963
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe oxidation potentials of antioxidants, antiozonats and mono- or diamine-derivatives were measured under the same condition by using polarography. The effects of the antiozonants on rubber vulcanizates were also measured, and the relation among these values were researched.
As the results, the following facts were found; (1) antiozonants were most effective when the half wave potentials of the agents existed in 0.2 to 0.3 volt. (2) Antioxidants were oxidized in higher voltage then antiozonants were. (3) The most effective antiozonants did not always serve as well for antioxidants.
Antiozonants might react more ionically than antioxidants, and lone pair electrons of nitrogen in amine derivatives might have a key point of the reaction.View full abstractDownload PDF (349K) -
OXIDATION POTENTIALS AND ULTRAVIOLET ABSORPTION OF AROMATIC AMINEST. Kotani, S. Tanaka, S. Yamashita, J. Furukawa1963 Volume 36 Issue 5 Pages 449-455
Published: 1963
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe oxidation potentials of anilin, diphenylamine, p-phenylenediamine, and N-phenyl-p-phenyleenedia-mine derivatives were measured by using polarography under the same condition, and the highest occupied energy levels of these chemicals were caluculated by means of simple L.C.A.O-M.O. method.
The oxidation potentials were found to relate linearly to the levels, and the following equation was obtained;
Vo=2.3λ-0.95
where Vo was the potentials (volt).
Now, the energy from the lowest vacant level to the highest occupied level of these chemicals related linearly to the frequencies calculated from ultraviolet absorption. From the results, the reasonance integral β was found to be about 52kcal/mol, when α+2β was adopted as a coulomb integral of nitrogen.
From these results, the reaction energy for the reaction between the amine derivatives and ozone was assumed to be lower than 6kcal/mol.View full abstractDownload PDF (517K) -
H. Sekiguchi, K. Sugawara, T. Arai, Y. Yoshida, Y. Akashi1963 Volume 36 Issue 5 Pages 455-458
Published: 1963
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe authors have produced for trial a tester with which shear modulus G, one of the important characteristics of rubber, could be measured in conformity with the strict theory of elasticity.
If we call the value of shear modulus, measured with this tester, as GSS, it has almost one-to-one correspondence to spring hardness Hs, Comparing Gss with Gs, shear modulus calculated from tensile stress at small extension, the former is a little larger than the latter when a specimen is soft. But the harder a testpiece is, the larger the difference of two values. The relation between Yerzley′s dynamic modulus Edvn and Gss is almost linear except in a case of soft rubber. The ratio of dynamic modulus G1, obtained by resonance method, to Gss is 1.06-1.10.
Also it is investigated by the new tester how the value of Gss varies when the measurement is done with piled up specimen.View full abstractDownload PDF (336K) -
[in Japanese]1963 Volume 36 Issue 5 Pages 459-465
Published: 1963
Released on J-STAGE: April 16, 2008
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[in Japanese]1963 Volume 36 Issue 5 Pages 465-473
Published: 1963
Released on J-STAGE: April 16, 2008
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[in Japanese]1963 Volume 36 Issue 5 Pages 474-484
Published: 1963
Released on J-STAGE: April 16, 2008
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[in Japanese]1963 Volume 36 Issue 5 Pages 485-487
Published: 1963
Released on J-STAGE: April 16, 2008
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[in Japanese]1963 Volume 36 Issue 5 Pages 488-495
Published: 1963
Released on J-STAGE: April 16, 2008
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[in Japanese]1963 Volume 36 Issue 5 Pages 496-497
Published: 1963
Released on J-STAGE: April 16, 2008
JOURNAL RESTRICTED ACCESSDownload PDF (232K)
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