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Predecessor
Volume 81, Issue 2
Displaying 1-9 of 9 articles from this issue
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Kazumi NAKAYAMA, Tomoko WATANABE, Yoshito OHTAKE, Mutsuhisa Furukawa2008 Volume 81 Issue 2 Pages 39-43
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSA new quantitative analytical method to determine the free sulfur content in vulcanized natural rubber was proposed. This method, i. e. a combination of tetrahydrofuran (THF) extraction followed by HPLC analysis in size exclusion chromatography mode, required much less sample compared with that needed in the ordinary sodium sulfite method specified by JIS K 6234 and ASTM D297. The detectable sensitivity of the new method was about hundreds times of the former method. In addition, it was proven that only free sulfur content could be determined by this method whereas the sum of the free sulfur and polysulfide contained in the rubber sample was detected by the ordinary sodium sulfite method.View full abstractDownload PDF (696K) -
Mio YAMADA, Yoshihiko SUGIOKA, Hiroto SHIN, Ryozo AMANO, Yoshito OHTAK ...2008 Volume 81 Issue 2 Pages 44-50
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSAntioxidant in vulcanized rubber dissolves rapidly when the rubber is immersed in water that contains residual chlorine. Phenolic type antioxidant that has low solubility is not easy to dissolve compared with amine type antioxidant that has high solubility. Furthermore the dissolution of an antioxidant is controlled by its molecular weight; antioxidant of high molecular weight is not dissolved easily compared with that of low molecular weight. On the other hand, when the antioxidant dissolves more, degradation on the surface of vulcanized rubber progresses gradually. The surface degradation with residual chlorine is prevented by the antioxidant of low solubility.View full abstractDownload PDF (11197K) -
Takao WADA, Mamoru UCHIDA, Naoya ICHIKAWA, Toshiaki SAKAKI, Takayuki H ...2008 Volume 81 Issue 2 Pages 51-57
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSThe protection movement of the global environment by reducing petroleum consumption and CO2 emission is the important problem for all industries including the car manufacture.
Our company decided the concept of developing petroleum-free tire aiming at the following two points to contribute to the society as a tire producer in 2000. One is to increase the usage of petroleum-free materials and the other is to reduce a tire's rolling resistance for reduced fuel consumption.
The weight ratio of petroleum-free material is raised from 44% to 70% by replacing synthetic rubber with natural rubber, carbon black with silica, mineral oil with vegetable oil and synthetic fiber with vegetable fiber. The substitution of rubber is important to the weight ratio of petroleum materials and tire performance. The rolling resistance and the grip performance in a wet road were improved by using the epoxidized natural rubber.View full abstractDownload PDF (9715K) -
Nobukatsu NEMOTO2008 Volume 81 Issue 2 Pages 58-64
Published: February 15, 2008
Released on J-STAGE: July 01, 2010
JOURNAL FREE ACCESSLinear polysiloxanes have been well-known to show the particular characteristics, such as flexibility of the main chain, low glass transition temperature, hydrophobicity based on alkyl side chain, thermostability, stability against atomic oxygen, and physiological inertness. Polysilarylenesiloxane derivatives are a series of useful polymers where an aromatic moiety is incorporated into the polysiloxane backbone, which would presumably improve the good properties of polysiloxane, especially the thermostability. The properties of polysilarylenesiloxane derivatives are influenced by the kind of arylene moiety, the substituted position of dimethylsilyl groups as well as the substituent on the arylene moiety, and so on. This paper deals with the new synthetic methods and thermal properties of the various novel polysilarylenesiloxane derivatives having naphthylene, anthrylene, phenanthrylene, and fluorenylene moieties as the arylene moiety. Additionally, this paper presents the synthesis and the thermal properties of the fully aromatic polysilarylenesiloxane derivatives as well as those of poly (tetramethylsilphenylenesiloxane) derivatives with functional groups on the phenylene moiety, such as oxyethylene groups and phenolic-hydroxyl groups.View full abstractDownload PDF (3135K) -
Kenkichi Murakami2008 Volume 81 Issue 2 Pages 65-69
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (6890K) -
Hirokazu Hasegawa2008 Volume 81 Issue 2 Pages 70-74
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (7776K) -
Hirokazu Hasegawa2008 Volume 81 Issue 2 Pages 75
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (2438K) -
2008 Volume 81 Issue 2 Pages 76-77
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (3727K) -
[in Japanese]2008 Volume 81 Issue 2 Pages 78
Published: February 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (210K)
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